Journal articles on the topic 'Mud crabs'
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1
Poulin, Remington X., Serge Lavoie, Katherine Siegel, David A. Gaul, Marc J. Weissburg, and Julia Kubanek. "Chemical encoding of risk perception and predator detection among estuarine invertebrates." Proceedings of the National Academy of Sciences 115, no. 4 (January 8, 2018): 662–67. http://dx.doi.org/10.1073/pnas.1713901115.
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An effective strategy for prey to survive in habitats rich in predators is to avoid being noticed. Thus, prey are under selection pressure to recognize predators and adjust their behavior, which can impact numerous community-wide interactions. Many animals in murky and turbulent aquatic environments rely on waterborne chemical cues. Previous research showed that the mud crab, Panopeus herbstii, recognizes the predatory blue crab, Callinectus sapidus, via a cue in blue crab urine. This cue is strongest if blue crabs recently preyed upon mud crabs. Subsequently, mud crabs suppress their foraging activity, reducing predation by blue crabs. Using NMR spectroscopy- and mass spectrometry-based metabolomics, chemical variation in urine from blue crabs fed different diets was related to prey behavior. We identified the urinary metabolites trigonelline and homarine as components of the cue that mud crabs use to detect blue crabs, with concentrations of each metabolite dependent on the blue crab’s diet. At concentrations found naturally in blue crab urine, trigonelline and homarine, alone as well as in a mixture, alerted mud crabs to the presence of blue crabs, leading to decreased foraging by mud crabs. Risk perception by waterborne cues has been widely observed by ecologists, but the molecular nature of these cues has not been previously identified. Metabolomics provides an opportunity to study waterborne cues where other approaches have historically failed, advancing our understanding of the chemical nature of a wide range of ecological interactions.
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Sayeed, Zubayer, Hiroaki Sugino, Yutaro Sakai, and Nobuyuki Yagi. "Consumer Preferences and Willingness to Pay for Mud Crabs in Southeast Asian Countries: A Discrete Choice Experiment." Foods 10, no. 11 (November 19, 2021): 2873. http://dx.doi.org/10.3390/foods10112873.
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The mud crab (Scylla serrata) is an economically important species found in the mangroves and estuaries of tropical countries and is a popular seafood product in the coastal areas of Southeast Asian markets. The aim of this study is to identify factors affecting consumer preference of mud crabs, and to understand consumers’ willingness to pay (WTP) for these factors in a Singapore market where imported mud crabs from other Asian countries are sold. The results showed that the country of origin matters to participants, affecting purchasing decisions, and consumers were willing to pay approximately 16.48 SGD (11.49 USD, the average price of four shops: 35.55 USD/kg for one mud crab) more if the mud crabs were from Sri Lanka if compared with Indonesian or Cambodian mud crabs. Moreover, consumers were willing to pay 25.08 SGD (17.48 USD) more if the mud crabs were alive and 13.40 SGD (9.34 USD) less if the mud crabs were frozen compared with fresh, but not alive, mud crabs. Furthermore, consumers’ preference in mud crab was associated with the consumers’ religion. Some groups of consumers preferred female mud crabs with eggs over male mud crabs, while other groups preferred male crabs. The results identified diverse consumer preference of mud crabs and, therefore, could provide new insights that are useful for sustainable consumption of mud crabs in the region.
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Wan Yusof, Wan Roslina, Fasihuddin Badruddin Ahmad, and Mummedy Swamy. "A Brief Review on the Antioxidants and Antimicrobial Peptides Revealed in Mud Crabs from the Genus of Scylla." Journal of Marine Biology 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/1850928.
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Mud crab from the genus Scylla is also known as mangrove crab, which has been well-accepted as a good source of protein. Recently, the antioxidant properties present in mud crabs have been reported to have a part in the protection of cells against free radicals. Meanwhile, numerous antimicrobial peptides from mud crabs have managed to be characterized through the display of antimicrobial activities against Gram-positive and Gram-negative bacteria. Hence, this paper is an effort to collect recent literatures on antioxidant and antimicrobial properties in every part of mud crabs which include muscle tissue, hemolymph, and crab shell. Moreover, the effort to understand the biological properties of mud crabs is important to enhance its production in aquaculture industry. Therefore, this review hoped to attract the attention of natural product researchers to focus on the potential therapeutic applications of mud crabs.
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Samidjan, Istiyanto, Diana Rachmawati, and Putut Har Riyadi. "Development of Polyculture Engineering Technology on Milkfish and Mud Crab Farming." Pertanika Journal of Tropical Agricultural Science 45, no. 2 (March 22, 2022): 377–89. http://dx.doi.org/10.47836/pjtas.45.2.03.
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The current study aimed to evaluate the role of polyculture engineering technology on milkfish and mud crab farming and observe the growth and survivability of different milkfish and mud crab combinations. The study used milkfish, which was received artificial feed containing 35 % protein content enriched with vitamin E (3%/biomass/day). The study used completely randomized design with 4 treatments (n = 3): T1 = 5 milkfish + 5 mud crab, T2 = 10 milkfish + 5 mud crab, T3 = 5 milkfish + 10 mud crab, T4 = 10 milkfish + 10 mud crab. The following parameters were measured: absolute weight growth, survival rate, feed conversion rate (FCR), and water quality. The difference in the density of milkfish and mud crabs significantly affected (p < 0.05) the growth and survivability of milkfish and mud crabs. The polyculture cultivation system exhibited a significant increase in absolute weight growth of milkfish and mud crabs, which is the highest increase found in T4 treatment (187.85 g ± 0.9 g and 60.65 g ± 0.95 g, respectively). Meanwhile, the survival rate of milkfish and mud crab was 95% ± 0.3% and 95% ± 2.3%, respectively, followed by a lower FCR at T4 (1.54 ± 0.10). The water quality remained good for fish and mud crabs to survive. Milkfish and mud crab polyculture greatly affect the abundance of phytoplankton, demonstrating good community structure.
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Schweiss, Virginia R., and Chet F. Rakocinski. "Destabilizing effects on a classic tri-trophic oyster-reef cascade." PLOS ONE 15, no. 12 (December 15, 2020): e0242965. http://dx.doi.org/10.1371/journal.pone.0242965.
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How interactions among multiple predators affect the stability of trophic cascades is a topic of special ecological interest. To examine factors affecting the stability of the classic tri-trophic oyster reef cascade within a different context, configurations of three predators, including the Gulf toadfish, Gulf stone crab, and oystershell mud crab, were manipulated together with either oyster shell or limestone gravel substrate within a multiple predator effects (MPE) experiment. Additionally, a complimentary set of trait-mediated-indirect interaction (TMII) experiments examined the inhibition of oyster consumption relative to mud-crab size and top predator identity in the absence of other cues and factors. The classic tri-trophic cascade formed by the toadfish-mud crab-oyster configuration was potentially weakened by several interactions within the MPE experiment. Consumption of oysters and mud crabs by the intraguild stone crab was undeterred by the presence of toadfish. Although mud crab feeding was inhibited in the presence of both toadfish and stone crabs, estimated non-consumptive effects (NCEs) were weaker for stone crabs in the MPE experiment. Consequently, the total effect was destabilizing when all three predator species were together. Inhibition of mud crab feeding was inversely related to direct predation on mud crabs within the MPE experiment. Complimentary TMII experiments revealed greater inhibition of mud crab feeding in response to stone crabs under sparse conditions. TMII experiments also implied that inhibition of mud crab feeding could have largely accounted for NCEs relative to oysters within the MPE experiment, as opposed to interference by other mud crabs or top predators. An inverse relationship between mud crab size and NCE strength in the TMII experiment disclosed another potentially destabilizing influence on the tri-trophic-cascade. Finally, although habitat complexity generally dampened the consumption of oysters across MPE treatments, complex habitat promoted mud crab feeding in the presence of toadfish alone. This study underscores how ecological interactions can mediate trophic cascades and provides some additional insights into the trophic dynamics of oyster reefs for further testing under natural conditions.
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Duarte, Rafael C., Gustavo M. Dias, Augusto A. V. Flores, and Martin Stevens. "Different ontogenetic trajectories of body colour, pattern and crypsis in two sympatric intertidal crab species." Biological Journal of the Linnean Society 132, no. 1 (November 25, 2020): 17–31. http://dx.doi.org/10.1093/biolinnean/blaa168.
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Abstract Animals frequently exhibit great variation in appearance, especially in heterogeneous habitats where individuals can be concealed differentially against backgrounds. Although background matching is a common anti-predator strategy, gaps exist in our understanding of within- and among-species variation. Specifically, the drivers of changes in appearance associated with habitat use and occurring through ontogeny are poorly understood. Using image analysis, we tested how individual appearance and camouflage in two intertidal crab species, the mud crab Panopeus americanus and the mottled crab Pachygrapsus transversus, relate to ontogeny and habitat use. We predicted that both species would change appearance with ontogeny, but that resident mud crabs would exhibit higher background similarity than generalist mottled crabs. Both species showed ontogenetic changes; the mud crabs became darker, whereas mottled crabs became more green. Small mud crabs were highly variable in colour and pattern, probably stemming from the use of camouflage in heterogeneous habitats during the most vulnerable life stage. Being habitat specialists, mud crabs were better concealed against all backgrounds than mottled crabs. Mottled crabs are motile and generalist, occupying macroalgae-covered rocks when adults, which explains why they are greener and why matches to specific habitats are less valuable. Differential habitat use in crabs can be associated with different coloration and camouflage strategies to avoid predation.
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Dwi Hapsari, Trisnani, Azis Nur Bambang, Abdul Ghofar, and Aristi Dian Purnama Fitri. "Fishing pattern and environmentally friendly analysis on mud crab (Scylla spp.) fishery in Mojo mangrove ecosystem, Pemalang Regency, Central Java, Indonesia." E3S Web of Conferences 202 (2020): 02003. http://dx.doi.org/10.1051/e3sconf/202020202003.
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The high market demand of mud crabs has led to increase the capture so that their availability in the wild is threatened. The purpose of this study was to determine the fishing pattern of mud crabs and analyze the environmentally friendly of mud crab catching units in Mojo mangrove ecosystem. Data analysis used descriptive analysis to analyze the fishing pattern and analysis of the level of environmentally friendly based on nine FAO criteria. From the research it is known that the peak season of mud crabs fishing occurs during the west monsoon season and the usual season during the east monsoon season, while the famine season at the end of the east monsoon season. Observation results indicate that the majority of mud crabs caught are not in accordance with regulations (size <12 cm) with 70% of the total catch of mud crabs for soft shell crab farming needs. Based on environmental analysis of fishing gear, it is known that crab traps, trammel net, crabbing with a line and scoop net are environmentally friendly fishing gear with a score of 32.37, 26.81 and 32.40. However, there are criteria that do not meet environmentally friendly scores, namely the capture of mud crabs of a prohibited size and many non-target species caught with trammel net fishing gear.
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Munana, Nila, Irwani Irwani, and Widianingsih Widianingsih. "Pola Pertumbuhan Kepiting Bakau (Scylla serrata) Di Perairan Desa Bandengan Kendal." Journal of Marine Research 10, no. 1 (February 14, 2021): 14–22. http://dx.doi.org/10.14710/jmr.v10i1.28990.
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Kepiting bakau (Scylla serrata) merupakan jenis kepiting yang banyak ditemukan di beberapa daerah, salah satunya di Perairan Desa Bandengan, Kendal. Kepiting bakau setiap harinya ditangkap oleh nelayan, keadaan ini dapat mempengaruhi terhadap populasi kepiting bakau. Fase bulan dapat memberikan pengaruh terhadap kepiting bakau, seperti pada tingkah laku kepiting bakau. Tujuan dari penelitian ini yaitu untuk mengetahui pola pertumbuhan kepiting bakau pada fase bulan mati dan purnama di Perairan Desa Bandengan Kendal. Metode yang digunakan yaitu bersifat deskriptif eksploratif. Pengambilan data dilakukan sebanyak 6 kali periode pada 28 Desember 2019 – 9 Maret 2020, data dari kepiting bakau meliputi panjang karapas, lebar karapas, berat tubuh, jumlah kepiting bakau, dan parameter perairan. Jumlah kepiting bakau yang diperoleh selama penelitian sebanyak 212 ekor bulan mati dan 236 ekor bulan purnama. Hasil penelitian menunjukkan pola pertumbuhan kepiting bakau jantan bulan mati bersifat allometrik positif, sedangkan pada kepiting bakau betina bersifat allometrik negatif. Sedangkan, pada purnama 1 bersifat allometrik positif, bulan purnama 2 dan bulan purnama 3 bersifat allometrik negatif, sedangkan kepiting bakau betina bersifat allometrik negatif. Mud crab (Scylla serrata) is a type of crab that is found in several areas, one of which is in the waters of Bandengan Village, Kendal. Every day mud crabs are caught by fishermen, this situation can affect the mangrove crab population. The moon phase can affect mud crabs, such as the behavior of mud crabs. The purpose of this study was to determine the growth pattern of mud crabs in the new moon and full moon phases in the waters of the village of Bandengan, Kendal. The method used is descriptive exploratory. Data collection was carried out 6 times during the period on 28 December 2019 - 9 March 2020, data from mud crabs included carapace length, carapace width, body weight, number of mangrove crabs, and water parameters. The number of mud crabs obtained during the study was 212 new moons and 236 full moons. The results showed that the growth pattern of male mud crabs in the new moon was positive allometric, while the female mud crabs were negative allometric. Meanwhile, full moon 1 is allometric positive, full moon 2, and full moon 3 allometric negatives, while female mud crabs are allometric negative.
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Iromo, Heppi, Zainuddin, and dan Syawaluddin. "Study of Mud Crab Species (Scylla Spp.) In Brackish Waters North Kalimantan Province." IOP Conference Series: Earth and Environmental Science 1083, no. 1 (September 1, 2022): 012049. http://dx.doi.org/10.1088/1755-1315/1083/1/012049.
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Abstract Despite the importance of the mud crab species (genus Scylla) both in the development of crab culture in brackish waters, knowledge of mud crab species diversity for sustainable management throughout the coastal areas of North Kalimantan Province is still unclear. Therefore, this study was conducted to describe. The diversity of mud crabs in these waters is based on observations of crab morphology collected from five small islands in the coastal area of North Kalimantan. This study aims to identify the mud crab (Scylla spp.) species that live in the waters of North Kalimantan. It is hoped that this research can provide basic information about the types of mangrove crabs (Scylla spp.) that exist and live in the waters of North Kalimantan so that they can be used as a reference in the development and conservation of mud crab resources in North Kalimantan. This study uses a descriptive method to describe and describe the existing conditions in the field. Sampling was taken at random with different weights of 5 crabs/location at each high tide and carried out 2 times in every month. Sampling locations were carried out on several islands with many traditional ponds around the waters of North Kalimantan. The results of the study from Abstract100 samples of mud crabs showed that the types of mangrove crabs found in the waters of North Kalimantan were two species, namely Scylla serrata and Scylla tranquebarica.
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Altieri, Andrew H., and Andrew D. Irving. "Species coexistence and the superior ability of an invasive species to exploit a facilitation cascade habitat." PeerJ 5 (February 21, 2017): e2848. http://dx.doi.org/10.7717/peerj.2848.
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Facilitation cascades generated by co-occurring foundation species can enhance the abundance and diversity of associated organisms. However, it remains poorly understood how differences among native and invasive species in their ability to exploit these positive interactions contribute to emergent patterns of community structure and biotic acceptance. On intertidal shorelines in New England, we examined the patterns of coexistence between the native mud crabs and the invasive Asian shore crab in and out of a facilitation cascade habitat generated by mid intertidal cordgrass and ribbed mussels. These crab species co-occurred in low intertidal cobbles adjacent to the cordgrass–mussel beds, despite experimental findings that the dominant mud crabs can kill and displace Asian shore crabs and thereby limit their successful recruitment to their shared habitat. A difference between the native and invasive species in their utilization of the facilitation cascade likely contributes to this pattern. Only the Asian shore crabs inhabit the cordgrass–mussel beds, despite experimental evidence that both species can similarly benefit from stress amelioration in the beds. Moreover, only Asian shore crabs settle in the beds, which function as a nursery habitat free of lethal mud crabs, and where their recruitment rates are particularly high (nearly an order of magnitude higher than outside beds). Persistence of invasive adult Asian shore crabs among the dominant native mud crabs in the low cobble zone is likely enhanced by a spillover effect of the facilitation cascade in which recruitment-limited Asian shore crabs settle in the mid intertidal cordgrass–mussel beds and subsidize their vulnerable populations in the adjacent low cobble zone. This would explain why the abundances of Asian shore crabs in cobbles are doubled when adjacent to facilitation cascade habitats. The propensity for this exotic species to utilize habitats created by facilitation cascades, despite the lack of a shared evolutionary history, contributes to species coexistence and the acceptance of invasives into a diverse community.
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Hastuti, Yuni Puji, Arul Tabah Prastomo, Ridwan Affandi, Wildan Nurussalam, Dudi Muhammad Wildan, and Syamsul Bahri Agus. "EVALUATION OF THE USE OF MALANG SAND AS A FILTER MATERIAL ON WATER QUALITY, PHYSIOLOGICAL RESPONSES AND PRODUCTION PERFORMANCE OF MUD CRAB Scylla serrata." Jurnal Ilmu dan Teknologi Kelautan Tropis 12, no. 3 (December 31, 2020): 833–48. http://dx.doi.org/10.29244/jitkt.v12i3.32939.
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Mud crab Scylla serrata is one of crustacean commodities with high economic value. One of the unsolved obstacles in mud crabs cultivation is crabs’ stress level caused by the declining water quality. The recirculating system is a method for maintaining water quality throughout the rearing period of culture crab. This system can use a variety of physical filter materials, such as zeolite, sand, and other materials. This study aimed to determine the amount of malang sand as a physical filter which positively affect the physiological responses and production performance of mud crabs. This research was carried out using a recirculating system with a completely randomized design conducted in five treatments with three replicates, i.e., malang sand with a weight of 0 kg (control), 5 kg, 10 kg, 15 kg, and 20 kg. The results proved that the best physiological response and production performance of mud crab was observed at malang sand treatment with a weight of 5 kg. This treatment showed specific growth rate, absolute growth rate for body weight, absolute growth rate for body length, and the survival rate of mud crabs with the highest value of 0.18±0.061%, 0.13±0.05 g/day, 0.0016±0.00006 cm/day, and 77.77%, respectively, yet it had the lowest feed conversion ratio of 3.76±004. In addition, the 5 kg treatment had water quality parameters in the tolerable ranges for mud crabs’ growth.
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Pane, Andina Ramadhani Putri, Reza Alnanda, and Ali Suman. "STATUS PEMANFAATAN PERIKANAN KEPITING MERAH (Scylla olivacea) DI PERAIRAN MIMIKA DAN SEKITARNYA, PAPUA." Marine Fisheries : Journal of Marine Fisheries Technology and Management 11, no. 1 (August 10, 2020): 1–12. http://dx.doi.org/10.29244/jmf.v11i1.28168.
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Red mud crab (Scylla olivacea) is an economic commodity that is traded into foreign countries such as China, Malaysia, and Singapore so that fishing activities are carried out intensively. Therefore, we need scientific information about the status of red mud crab fishery stock. Information about the natural mortality, fishing mortality, and the exploitation level of crabs can be used as the basis for crab fisheries management. The study was conducted for 2 (two) years, February to October 2017, and March to December 2018 using the survey method. The results showed that 36% of the crabs were caught below the 120 mm size as regulated in Regulation of the Minister of Marine Affairs and Fisheries No. 12 Year 2020. The carapace width of the first capture (CWc) is smaller than the size of the carapace width of the first gonad maturity (CWm). This shows that the crab has been captured before the first gonad maturity (CWc < CWm). The growth rate (K) is 0.65 per year with fishing mortality (F) higher than natural mortality (M). Exploitation level (E) 0.70 which indicates that the status fisheries of red mud crab in Mimika have been overexploited. Efforts need to be done by the Regional Government in collaboration with local community leaders in providing counseling and information about the size of red mud crabs that can be caught and reduce efforts to use crabs by as much as 40% of what is currently done.
Keywords: status explotation, red mud crabs, Mimika, FMA 718
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Xie, J., H. Mei, S. Jin, L. Bu, X. Wang, C. Wang, Q. Zhao, R. Ma, and S. Zhou. "Outbreak of vibriosis associated with Vibrio parahaemolyticus in the mud crab Scylla paramamosain cultured in China." Diseases of Aquatic Organisms 144 (May 27, 2021): 187–96. http://dx.doi.org/10.3354/dao03587.
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In this study, a Gram-negative bacterium was isolated from diseased Scylla paramamosain and tentatively named strain QX17. The bacterial isolate was identified as Vibrio parahaemolyticus based on morphological and biochemical characteristics and molecular identification with the 16S rRNA and HSP60 genes. In the challenge experiment, S. paramamosain injected intramuscularly with the V. parahaemolyticus isolate developed pathological signs similar to the naturally diseased mud crabs. The infection experiment also showed that the median lethal dosage (LD50) for QX17 was 4.79 × 102 CFU g-1 (crab weight). Histopathological analysis of the diseased mud crabs infected with V. parahaemolyticus showed deformation and basement membrane rupture of hepatopancreatic tubules in the hepatopancreas, and disordered and broken muscle fiber in the muscle. Antimicrobial susceptibility tests revealed that QX17 was highly sensitive to most of the tested aminoglycosides, tetracyclines, and quinolones. To the best of our knowledge, this is the first study reporting isolation and antibiotic sensitivities of V. parahaemolyticus from cultured mud crabs. The discovery of V. parahaemolyticus in cultured mud crabs not only adds to the growing list of emerging pathogens in crab aquaculture in China, but also highlights the necessity of developing early detection strategies and appropriate interventions to reduce the damage caused by V. parahaemolyticus in mud crab aquaculture.
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Sarower, M. G., S. Bilkis, M. A. Rauf, M. Khanom, and M. S. Islam. "Comparative Biochemical Composition of Natural and Fattened Mud Crab Scylla serrata." Journal of Scientific Research 5, no. 3 (August 29, 2013): 545–53. http://dx.doi.org/10.3329/jsr.v5i3.14082.
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The biochemical composition (proteins, lipid, ash and moisture) of different parts of the body (gill, meat, egg) of fattened and natural mud crab Scylla serrata was determined. Twenty four samples of S. serrata (12 from wild & 12 from fattening farm) of different sizes and sexes (half of the sample is male) were used in this study. The mean protein and lipid contents are significantly (p<0.05) higher in fattened crabs than natural in natural crabs regardless of size and sexes. Moisture and ash were higher in natural crab than in fattened ones. The highest and lowest moisture content was noticed in gills and eggs in both natural and fattened crabs. Protein and lipid contents were comparatively higher in eggs than in other body parts. Female crabs contained high protein and lipid than males in both natural and fattened crabs. From the results of this study it may considered that fattened crab might be comparatively superior to natural crabs as they appear to provide higher levels of protein and fat for human nutrition. Keywords: Biochemical composition; Natural and Fattened mud crab; Scylla serrata © 2013 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. doi: http://dx.doi.org/10.3329/jsr.v5i3.14082 J. Sci. Res. 5 (3), 545-553 (2013)
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Pratiwi, Rianta, Sukristijono Sukardjo, Ernawati Widyastuti, and Muhammad Hafizt. "An ecological study and its fishery potential of the mud crab, Scylla serrata (Forskål, 1775) in Segara Anakan mangrove waters, Cilacap, Indonesia." Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) 12, no. 3 (September 1, 2022): 404–13. http://dx.doi.org/10.29244/jpsl.12.3.404-413.
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Segara Anakan mangrove waters is a lagoon surrounded by mangrove forests and muddy land. Mangrove forests have an ecological function such as spawning ground, nursery ground, and feeding ground for various biota. Mud crab is one of fishery commodities, which is important in Indonesia. Segara Anakan mangrove waters, is one of the fishing villages which catch mud crabs because of the high demand. The high demand for mud crabs needs to be balanced with the right management strategy, so that the population will not extinction. The purpose of this study is to determine the ecology of mud crab, Scylla serrata Forskål, 1775 and its fishery potential and also to explain the habitat population in the Segara Anakan mangrove forest. Many previous studies conducted by previous researchers. Environmental parameters, i.e. temperature, salinity, oxygen, light penetration, and nature of the bottom were also studied. Crabs were caught by traditional crab catch fishery called “Wadong” (fish pot). Around 6487 crabs were caught by “wadong”. The catch consisted of 2920 male crabs (45.02%) and 3567 female crabs (54.98%). The dominant size groups for males and females in terms of their carapace length (CL) were 35.00-40.00 mm and 43.00-106.00 mm, respectively. Females mature at smaller size, i.e. at 42.70 mm CL. Breeding takes places during June-July. CL weight relationship showed that males were heavier than females. The regression equations for both sexes are as follows: WF= 10-3 5.871 L2.4443 (r= 0.999) and WM= 10-4 4.043 L3.1035 (r= 0.999).
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Ye, Shaopan, Xiaoyan Yu, Huiying Chen, Yin Zhang, Qingyang Wu, Huaqiang Tan, Jun Song, et al. "Full-Length Transcriptome Reconstruction Reveals the Genetic Mechanisms of Eyestalk Displacement and Its Potential Implications on the Interspecific Hybrid Crab (Scylla serrata ♀ × S. paramamosain ♂)." Biology 11, no. 7 (July 7, 2022): 1026. http://dx.doi.org/10.3390/biology11071026.
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The lack of high-quality juvenile crabs is the greatest impediment to the growth of the mud crab (Scylla paramamosain) industry. To obtain high-quality hybrid offspring, a novel hybrid mud crab (S. serrata ♀ × S. paramamosain ♂) was successfully produced in our previous study. Meanwhile, an interesting phenomenon was discovered, that some first-generation (F1) hybrid offspring’s eyestalks were displaced during the crablet stage I. To uncover the genetic mechanism underlying eyestalk displacement and its potential implications, both single-molecule real-time (SMRT) and Illumina RNA sequencing were implemented. Using a two-step collapsing strategy, three high-quality reconstructed transcriptomes were obtained from purebred mud crabs (S. paramamosain) with normal eyestalks (SPA), hybrid crabs with normal eyestalks (NH), and hybrid crabs with displaced eyestalks (DH). In total, 37 significantly differential alternative splicing (DAS) events (17 up-regulated and 20 down-regulated) and 1475 significantly differential expressed transcripts (DETs) (492 up-regulated and 983 down-regulated) were detected in DH. The most significant DAS events and DETs were annotated as being endoplasmic reticulum chaperone BiP and leucine-rich repeat protein lrrA-like isoform X2. In addition, the top ten significant GO terms were related to the cuticle or chitin. Overall, high-quality reconstructed transcriptomes were obtained for the novel interspecific hybrid crab and provided valuable insights into the genetic mechanisms of eyestalk displacement in mud crab (Scylla spp.) crossbreeding.
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Das, Kumar Prasun, Subrata Mondal, and Abdulla Al Asif. "Growth and economic performance of different supplementary feed on female mud crab (Scylla olivacea) fattening in plastic box." Asian Journal of Medical and Biological Research 5, no. 4 (February 3, 2020): 303–15. http://dx.doi.org/10.3329/ajmbr.v5i4.45269.
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The present study was conducted to identify low cost feed for female mud crab (Scylla olivacea) fattening practice in plastic box and the effect of different feeds on growth and survival rate of mud crab. A number of 30 adult non-gravid female crabs were reared into rectangular shaped plastic boxes, each box containing one crab. Three types of feed such as Chicken intestine, Tilapia and Apple Snail meat were supplied as feed at 10% of body weight of the crabs once daily considered as Treatment-1, Treatment-2 and Treatment-3 respectively with 10 replications each to compare the fattening system.. The crabs in plastic boxes were floating into water to fatten for 10 days. Survival rate of crab was found 100%, 90% and 100% respectively in chicken intestine, tilapia and apple snail meat. In the experiment food conversion ratio (FCR) and specific growth rate in weight (SGRw) were varied significantly among different foods (P >0.05). Comparative benefit-cost analysis showed that use of chicken intestine as feed in crab fattening attained higher net profit than crab fattening used tilapia and apple snail s feed from 7-12 days fattening period The present study revealed that utilization of chicken intestine as feed for mud crab fattening might be better than any other feeds and cost effective in Bangladesh.
Asian J. Med. Biol. Res. June 2019, 5(4): 303-315
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Moser, S. M., D. J. Macintosh, S. Pripanapong, and N. Tongdee. "Estimated growth of the mud crab Scylla olivacea in the Ranong mangrove ecosystem, Thailand, based on a tagging and recapture study." Marine and Freshwater Research 53, no. 7 (2002): 1083. http://dx.doi.org/10.1071/mf01048.
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Growth of the mud crab Scylla olivacea in the Ranong mangrove ecosystem was estimated using a size-transition matrix. Male (n = 1284) and female (n = 1069) mud crabs were tagged with externally visible and numbered T-tags and then released. Tagged crabs caught by commercial small-scale fishermen were measured and re-released. Data from 664 male and 463 female recaptures were obtained in total. Moult increment in the investigated size range (5–13 cm external carapace width) was independent of size and sex. The size distribution of mud crab moult increments was fitted to a normal distribution, resulting in a mean moult increment of 1.67 ± 0.48 cm (s.d.). This result was used to estimate the proportion of males and females moulting, and the selectivity of the baited traps used to catch them. Trap selectivity among the tagged crabs was uniform for both male and female crabs. Also, the proportion of those moulting decreased with size in the same manner for both sexes. The predictions of growth from the final size-transition matrix were in agreement with the observed growth of a subset of tagged crabs not used in the estimation of parameters in the size-transition matrix and growth of crabs reared in captivity over a period of 2 months.
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Gita, Rina Sugiarti Dwi, Sudarmadji Sudarmadji, and Joko Waluyo. "The Influence of Abiotic Factors on The Diversity and Abudance of Mangrove Crabs (Scylla spp.) in Blok Bedul Alas Purwo National Park Mangrove Forest." Jurnal ILMU DASAR 16, no. 2 (November 22, 2016): 63. http://dx.doi.org/10.19184/jid.v16i2.1517.
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The purpose of this study was to determine the diversity, abundance and abiotic factors influence the diversity and abundance of mud crab (Scylla spp.) In mangrove forests Blok Bedul Alas Purwo National Park. This research method uses descriptive quantitative method. Diversity is calculated by using the formula of Shannon Wiener, mangrove crab abundance is calculated using the formula abundance Kreb whereas the method of analysis using simple linear regression. The data used in this research is data such as the number and type of biotic mud crabs and data abiotic form of measurement of temperature, pH, salinity, substrate type, and the tide. This study shows the results include mangrove crab species diversity index of every observation stations in the mangrove forests Blok Bedul Alas Purwo National Park is H '= 0.315 showing that the level of diversity in every station is low. The abundance of mud crabs in the mangrove forests Blok Bedul Alas Purwo National Park is 0.0011 individuals / m² which showed that the level of abundance at relatively low research station. Results of the analysis of the influence of abiotic factors on the diversity and abundance of mud crabs in mangrove forests Blok Bedul National Park Alas Purwo not significant (p> 0.05) the diversity and abundance of mangrove crab. Keywords : abiotic factors , abundance , diversity , mud crab , regression
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Li, Chunbo, Chenchen Shen, Guangpeng Feng, Xiaorong Huang, and Xincang Li. "Preference for Shelters at Different Developmental Stages of Chinese Mitten Crab (Eriocheir sinensis)." Animals 12, no. 7 (April 3, 2022): 918. http://dx.doi.org/10.3390/ani12070918.
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A shelter is a good habitat for aquatic organisms, which could aid in avoiding cannibalism and facilitate predation. Chinese Mitten Crab (Eriocheir sinensis) is an important aquaculture species with troglodytism and nocturnal habit. To clarify the preference for shelters at different developmental stages of E. sinensis, different shelters (mud, sand, grass and rocks) were selected for comparison. These results indicated that juvenile crabs had a significant preference for grass; button-sized crabs preferred to hide in mud; and the favorite shelters for parent crabs were rocks, followed by mud. E. sinensis in three stages all showed concealing behavior. The concealing behavior of juvenile crabs was the most significant, followed by button-sized and parent crabs. Additionally, E. sinensis held a low hiding rate at night but a high hiding rate during the daytime due to nocturnal habits. These findings will help to better understand the habits of E. sinensis and provide a reference for resource restoration, habitat construction and the restoration of E. sinensis.
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Mwaluma, James M., and Boaz Kaunda-Arara. "Growth and survival of Mud Crab, Scylla serrata, reared in bottom and floating cages within Mida Creek mangroves, coastal Kenya." Aquatic Ecosystem Health & Management 24, no. 1 (January 2, 2021): 27–34. http://dx.doi.org/10.14321/aehm.024.01.06.
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Abstract Mud Crab fattening is a relatively new business idea in Kenya and is highly lucrative due to the reasonable prices offered at tourist hotels. This study was aimed at developing appropriate culture techniques for Mud Crabs to maximize harvestable biomass by the local communities and avoid recruitment overfishing. Growth and survival rates for mixed sex Mud Crabs was investigated for a period of 230 days in Mida Creek, Kenya, using bottom and floating cages, and two feed types in a crab fattening experiment. Crabs attained harvestable weight by the third month for both floating (466.2 ± 137 g) and bottom cages (542.2 ± 109.3 g). There was no significant difference in mean total weight of mixed-sex crabs in the two culture systems (t = 1.75, p>0.05), however males showed significantly higher total weight gain compared to females. A higher overall survival rate was found for crabs cultured in floating cages (63.8%), compared to bottom cages (44.9%). There was no significant difference in growth performance between crabs fed gastropod tissues and those fed fish offal. The long-term specific growth rate for floating cages (0.69 g d-1) was not significantly different from that of bottom cages (0.92 g d-1). An analysis of potential return on investment showed the floating cages to be more profitable per production cycle compared to the bottom ones. The floating cage system and mono-sex male crab culture are recommended to farmers within mangrove tidal flats in Kenya.
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Gao, Weifeng, Ye Yuan, Zhi Huang, Yongyi Chen, Wenxiao Cui, Yin Zhang, Hafiz Sohaib Ahmed Saqib, et al. "Evaluation of the Feasibility of Harvest Optimisation of Soft-Shell Mud Crab (Scylla paramamosain) from the Perspective of Nutritional Values." Foods 12, no. 3 (January 29, 2023): 583. http://dx.doi.org/10.3390/foods12030583.
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Soft-shell crabs have attracted consumers’ attention due to their unique taste and nutritional value. To evaluate the feasibility of harvest optimisation of soft-shell mud crabs, the proximate composition, mineral composition, and total carotenoid, amino acid, and fatty acid contents of edible parts of male and female soft-shell mud crabs at different moulting stages were determined and compared from a nutritional value perspective. The results showed that the sex and moulting stages could significantly affect the nutritional values of the edible portions of soft-shell crabs. The female or male soft-shell crabs in the postmoult Ⅰ stage had a much richer mineral element content than that in other moulting stages. The total carotenoid content in female soft-shell crabs was significantly higher than that in male crabs in all moulting stages, while male soft-shell crabs had better performance in amino acid nutrition than female soft-shell crabs. Moreover, it was found that soft-shell crabs in the postmoult Ⅱ stage had significantly higher contents of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), while significantly lower contents of saturated fatty acids (SFA) than those in other stages. The present study will provide a reference basis for the diversified cultivation of soft-shell crabs, and further promote the development of the mud crab industry.
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Yudiati, Ervia, Arumning Tias Fauziah, Irwani Irwani, Agus Setyawan, and Insafitri Insafitri. "Growth analysis, mortality and exploitation level of Mud Crab Scylla serrata, Forskål 1775, (Malacostraca : Portunidae) in Mangkang Wetan waters, Semarang, Central Java, Indonesia." Jurnal Kelautan Tropis 23, no. 1 (February 13, 2020): 136. http://dx.doi.org/10.14710/jkt.v23i1.7149.
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Awareness of Mud Crab over exploitation in Mangkang Wetan Waters has been noticed. One of the reference information is the growth study to determine the condition of the mud crab population. High demand encourages the fisherman to catch more, which leads to overexploitation in nature. The study aimed to estimate the growth, mortality, and exploitation rate of mud crabs. The 921 mud crabs samples were collected from Mangkang Wetan Waters from October 2018 to January 2019. The method used was the survey method. The crabs were taken once a week for 4 months. The width and weight of crab carapace were measured. The growth rate of S. serrata was 0.93/year (male) and 0.69/year (female). The natural mortality rate of S. serrata was 1.08/year (male) and 0.89/year (female), the mortality of catch (F) was 0.55/year (male) and 1.09/year (female). The rate of exploitation of male S. serrata reached 34%, and the rate of exploitation of female S. serrata was 55%. The exploitation of female S. serrata shows that overexploitation has occurred because the optimum value of exploitation (E-OPTIMUM) is equivalent to E=50%.
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Hastuti, Yuni Puji, Priyo Handoyo Wicaksono, Wildan Nurusallam, Siska Tridesianti, Yuli Siti Fatma, Kukuh Nirmala, Iman Rusmana, and Ridwan Affandi. "ADDITION OF SHELTERS TO CONTROL THE PHYSIOLOGICAL RESPONSES AND PRODUCTION OF MUD CRAB Scylla serrata IN RECIRCULATION AQUACULTURE SYSTEM." Jurnal Ilmu dan Teknologi Kelautan Tropis 12, no. 1 (April 27, 2020): 299–310. http://dx.doi.org/10.29244/jitkt.v12i1.30753.
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The availability of shelters in a specific density is expected to increase the production of mud crabs (Scylla serrata) in a recirculation system. Shelter, as one of the abiotic factors, plays a pivotal role in reducing death caused by cannibalism of crab and suppressing the stress levels of biota. Recirculation Aquaculture System (RAS), with the culture box capacity 60 L supported by the shelters, is predicted to produce the best physiological and growth responses of mud crabs. This present study aims to evaluate the effect of shelter addition in the environmental recirculation system on the physiological responses and production of mud crabs S. serrata with a density of 10 crabs per one culture box containing 60 L of seawater. The research was set up with three treatments of shelter addition, i.e., two shelters (S2), four shelters (S4), six shelters (S6), and control without shelter (C). Results showed that S6 was the best treatment with a survival rate of 73.33 ± 5.8%, a specific growth rate of 0.886 ± 0.014%, the growth rate of carapace width 0.024 ± 0.004 cm/day, and the lowest feed conversion ratio than those of other treatments. S6 treatment significantly influenced the total hemocyte count of crabs at the early cultivation (P <0.05). Addition of six shelters could optimize the growth of mud crabs with a stocking density of 10 crabs in one culture box.
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Purna, Selobing, Misbakhul Munir, and Dian Sari Maisaroh. "Study of Ectoparasite Prevalence and Intensity on Mud Crab (Scylla serrata) in Mangrove Area of Wonorejo Surabaya." Journal of Marine Resources and Coastal Management 2, no. 1 (February 16, 2021): 1–6. http://dx.doi.org/10.29080/mrcm.v2i1.1121.
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This study aims to know various types, prevalence, and intensity of ectoparasite on mud crab (Scylla serrata) in Mangrove Forest Wonorejo, Surabaya. This study used survey method with random sampling to collect the data. This study was conducted in November 2020. Ectoparasite in this study collected by smear method. In-situ water quality measurement were applied in this study. Mud crab (Scylla serrata) in this study was obtained from local fisherman that consist of 30 crabs. There are 3 types of ectoparasite was infected mud crab there are Octolasmis sp. (208 ind), Zoothamnium sp. (93 ind), dan Epistylis sp. (116 ind). Those ectoparasite was found in mud crabs gills. The highest prevalence was Octolasmis sp. (70%), Epistylis sp. (30%), Zoothamnium sp. (23%). The highest intensity was Zoothamnium sp (13,29 ind/crab), Epistylis sp. (12,89 ind/crab), dan Octolasmis sp. (9,90 ind/crab). Based on Ministerial Decree of Ministry Environment and Forestry No. 1 of 2004 water quality in Wonorejo Mangrove Forest was still optimal for life cycle of mud crab with average of temperature is 31,20°C, Dissolved Oxygen 5,53 mg/l, salinity 11 ppt, and pH 7,40.
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Suherman, Sutianto Pratama, Rahmatiya Marjan, and Arafik Lamadi. "Octolasmic Octolasmis spp. parasite attack on mudcrab Scylla serrata in Tomini Bay." Tomini Journal of Aquatic Science 3, no. 2 (November 14, 2022): 61–67. http://dx.doi.org/10.37905/tjas.v3i2.14179.
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The present study aimed to identify the Octolasmis spp. ectoparasite’s intensity and prevalence in mud crab in Pohuwato Regency. It employed survey and site observation methods with sampling technique of mud crabs in Pohuwato Regency. The research was carried out in three different sites: site 1 (Pohuwato Timur Village), site II (Bulili Village), and site III (Mootilango Village). The results showed that the parasites infesting mud crab in the three separate locations are Octolasmis angulata and Octolasmis cor. The highest intensity rate was at site III, which was dominated by Octolasmis cor. The prevalence of the parasite in sites I, II, and III was 60%, 40%, and 60% in consecutive order. Moreover, the parasite has a 100% and 46% prevalence in female and male crabs, respectively. The water quality indicator (involving temperature, pH level, and soluble oxygen) was at the appropriate rate for mud crab farming.
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Ario, Raden, Ali Djunaedi, Ibnu Pratikto, Petrus Subardjo, and Fauzia Farida. "Perbedaan Metode Mutilasi Terhadap Lama Waktu Molting Scylla serrata." Buletin Oseanografi Marina 8, no. 2 (October 4, 2019): 103. http://dx.doi.org/10.14710/buloma.v8i2.24886.
Full textAbstract:
Kepiting bakau (Scylla serrata) memiliki nilai ekonomis tinggi. Kebutuhan kepiting bakau selalu meningkat sehingga perlu diupayakan budidaya kepiting bakau secara intensif. Salah satu perkembangan teknologi dalam budidaya perikanan untuk meningkatkan produksi kepiting bakau adalah produksi kepiting cangkang lunak. Kepiting cangkang lunak merupakan kepiting fase ganti kulit (molting) yang mempunyai keunggulan cangkangnya lunak sehingga dapat dikonsumsi secara utuh. Untuk mempercepat kepiting molting diperlukan berbagai rangsangan yang salah satunya adalah menggunakan metode mutilasi. Tujuan penelitian untuk mengetahui perbedaan lama waktu molting dan pertumbuhan berat kepiting bakau dengan menggunakan metode mutilasi pada kaki jalan dan capit. Metode penelitian yang digunakan yaitu metode eksperimental dengan rancangan acak lengkap (RAL) yang terdiri dari empat perlakuan, yaitu mutilasi kaki jalan dan capit, semua kaki jalan, capit, dan alami. Biota yang digunakan berjumlah 40 ekor dengan 10 kali ulangan tiap perlakuan. Data yang diperoleh berupa lama waktu molting serta pertambahan berat mutlak kepiting bakau yang dianalisis menggunakan uji statistik parametrik. Hasil penelitian menunjukkan metode mutilasi berpengaruh terhadap lama waktu molting dengan waktu molting tercepat pada perlakuan mutilasi kaki jalan dan capit rata-rata 13 hari. Metode mutilasi tidak berpengaruh terhadap pertumbuhan berat mutlak dengan nilai tertinggi pada kepiting perlakuan alami sebesar 53,30 gram. Mud crabs (Scylla serrata) are known to have a high economic value. The increasing demand of mud crabs for consumption rxcequires higher production. Therefore, mud crabs need to be cultivated intensively. One of the methods to improve the values of mud crabs’ aquaculture is by producing soft-shell crabs. Soft-shell crabs are produced during molting phase in which the crab shed it’s exoskeleton in order to grow. In the fisheries industry, the soft-shell crabs are considered to be more valuable as it can be consumed as a whole. Accelerating the production of molting crabs, requires stimulus. One of the methods is mutilation. The aim of this study is to estimate the periods required for molting under different treatments, as well as calculating the increase of total weight of molting crabs.. The method used was an experimental method which contained four treatments. The treatments are mutilation of walking legs and claws, all of walking legs, claws, and no mutilation. The number of crabs used was 40 with 10 replications per treatment. The data obtained in the period of molting and the increase of total weight of the mud crabs were analyzed using ANOVA. The result shows that mutilation affects the period of crab’s molting in which the fastest molting (13 days on average) occurred after mutilation of walking legs and claws. This mutilation method does not influence the increase of total weight and the highest value is showed in non-treated group with the increase of 53,30 grams in weight.
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Lan, Nguyen Phuong, Do Thi Thanh Trung, Van Thu Vu, and Le Tat Thanh. "Establishment of a procedure to determine the content of 17 amino acids in soft-shell crab (Scylla sp.)." Vietnam Journal of Biotechnology 18, no. 3 (November 28, 2020): 487–95. http://dx.doi.org/10.15625/1811-4989/18/3/14484.
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Mud crab Scylla sp. is a common sea crab species in Vietnam as well as in Asia Pacific. Today, mud crabs are raised on a large scale to be harvested at the soft molting stage because of the high economic value of the finished shell crabs. At present, the processing of soft shell crabs is limited to whole packaging and exporting. However, 30% of soft-shelled crabs in processing often lose their feet and claws, which reduce production costs. Therefore, it is necessary to study the technology of processing soft-shell crabs to improve the value of soft-shelled crab products. Recently, the application of enzymes in processing has brought many benefits such as being environmentally friendly and creating many bioactive substances. In this journal, we built the procedure to determine amino acid content in the processing of Scylla sp. to ensure the quality of products obtained after processing. This procedure based on HPLC using a fluorescence reader. The results showed that the amino acid content after hydrolysis process by enzyme technology reached 65.58% dry weight and contains many valuable amino acids such as lysine, leucine, valine, methionine, histidine.
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Gunarto, Gunarto, Herlinah Herlinah, Muliani Muliani, Bunga Rante Tampangallo, and Kamaruddin Kamaruddin. "The effect of ice trash fish, Leiognathus equula (Forsskål, 1775) (Percomorphi, Leiognathidae) and oyster, Crassostrea iredalei (Faustino, 1932) (Ostreida, Ostreidae) on the growth and mating of the mud crab, Scylla paramamosain Estampador, 1950 (Brachyura, Portunidae), cultured in a controlled tank." Crustaceana 95, no. 8-9 (November 18, 2022): 869–90. http://dx.doi.org/10.1163/15685403-bja10250.
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Abstract The aim of this study was to determine the most suitable kind of feed for the mud crab, Scylla paramamosain, to grow from juvenile to broodstock size and to monitor their monthly size and growth rate, as well as to (1) record them reaching maturity and (2) their subsequent mating frequency. For this research, a Complete Randomized Design was used with three treatments. Each treatment was carried out with 40 individuals. The crabs are usually grown in 90 m3 concrete tanks. The three feeds tested were: (A) trash fish, Leiognathus equula, (B) a combination of that ice trash fish and oyster meat from Crassostrea iredalei, and, (C) that same oyster meat only. The feed was always given at 3-10% of total body weight/day. Newly adult male crabs were selected for mating with a newly adult female crab. The male crabs fed treatments B and C grew faster than male crabs fed treatment A. While the female crabs fed treatment C grew significantly faster than female crabs fed treatment A (), but not significantly than the female crabs fed treatment B (). A total of 30 female crabs were followed in mating from July 2020 to January 2021, and the highest mating intensity was found from September to October 2020. The present study indicates that mud crabs grow fast when they are fed treatment C, i.e., oyster meat only.
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Siahainenia, Laura, and Debby A. J. Selanno. "PERFORMA DAN KARAKTER MORFOLOGIS KEPITING BAKAU YANG TERPAPAR LOGAM BERAT DI EKOSISTEM MANGROVE PASSO." TRITON: Jurnal Manajemen Sumberdaya Perairan 18, no. 2 (October 31, 2022): 149–57. http://dx.doi.org/10.30598/tritonvol18issue2page149-157.
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Mud crab (Scylla spp.) is one of the potential fishery commodities which is in great demand because it is delicious and nutritious and export value. Mangrove ecosystem in Passo is one of the mud crabs fishing grounds on the coast of Ambon Bay, but previous studies showed the mud crab specimens and its habitat were polluted by heavy metals lead (Pb) and cadmium (Cd) (Selanno & Siahainenia, 2021). The Research was carried out in the Passo mangrove ecosystem, in May-Oktober 2022. The aim of the research was to analyze the performance and morphological characters of mud crabs contaminated with heavy metals in the Passo mangrove ecosystem. Sampling of mud crabs using purporsive sampling method. The appearance and morphological characters of mud crabs were analyzed using descriptive-comparative methods. Mangrove crab specimens caught in the Passo mangrove ecosystem showed the abnormalities of morphological structural and the presence of ectoparasite organisms.
ABSTRAK
Kepiting bakau (Scylla spp.) merupakan salah satu komoditas perikanan potensial yang banyak diminati karena rasanya yang enak dan bergizi serta memiliki nilai ekspor. Ekosistem mangrove Passo merupakan salah satu daerah penangkapan kepiting di pesisir Teluk Ambon, namun penelitian sebelumnya menunjukkan habitat dan sampel kepiting mangrove tercemar oleh logam berat timbal (Pb) dan kadmium (Cd) (Selanno & Siahainenia, 2021). Penelitian dilakukan di ekosistem mangrove Passo, pada bulan Mei-Oktober 2022. Penelitian ini bertujuan menganalisis performa dan karakter morfologis kepiting bakau yang tercemar logam berat. Sampling kepiting bakau menggunakan metode purporsive sampling. Performa dan karakter morfologis kepiting bakau dianalisis menggunakan metode deskriptif-komparatif. Sampel kepiting bakau yang tertangkap di ekosistem mangrove Passo menunjukkan kelainan struktur morfologi dan kehadiran organisme ektoparasit.
Kata Kunci: Morfologi, kepiting bakau, Passo, logam berat, ektoparasit
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Safitri, Shofi Firda, Sunaryo Sunaryo, and Ali Djunaedi. "Biomorfometri Kepiting Bakau di Perairan Bandengan Kendal." Journal of Marine Research 9, no. 1 (February 20, 2020): 55–64. http://dx.doi.org/10.14710/jmr.v9i1.25794.
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ABSTRAK: Kepiting Bakau (Scylla sp.) merupakan sumberdaya kelautan penting di Indonesia dan permintaan terhadap komoditi Kepiting Bakau cenderung meningkat, baik di pasar lokal maupun mancanegara. Peningkatan permintaan Kepiting Bakau dapat menyebabkan terganggunya populasi kepiting di alam. Penelitian ini bertujuan untuk mengkaji biomorfometrik Kepiting Bakau (Scylla sp.) yang meliputi ukuran lebar karapas Kepiting Bakau, hubungan lebar karapas dan berat, nisbah kelamin, faktor kondisi dan tingkat kematangan gonad Kepiting Bakau di perairan Bandengan Kendal pada November 2018 sampai Februari 2019. Penelitian menggunakan metode deskriptif eksploratif. Hasil penelitian menunjukkan, bahwa jumlah Kepiting Bakau yang diamati sebanyak 1914 ekor, terdiri atas 897 betina dan 1017 jantan, terdapat empat spesies Kepiting Bakau yang tertangkap di perairan Bandengan Kendal, yaitu Scylla serrata, Scylla tranquebarica, Scylla paramamosain dan Scylla olivacea, perbandingan betina dan jantan 1:1,19. Ukuran lebar karapas berkisar antara 43,75-165,5 mm dengan berat berkisar antara 23-660 g. Hubungan lebar karapas dengan berat bersifat allometrik negatif. Nilai faktor kondisi yang didapatkan berkisar 1,66–1,189. Tingkat kematangan gonad kepiting betina didominasi oleh TKG I dan II, pada bulan November 2018 – Februari 2019 di perairan Bandengan Kendal belum terjadi masa puncak pemijahan. ABSTRACT: Mud crabs (Scylla sp.) are important marine resources in Indonesia and demand for mud crabs tends to increase, both in local and foreign markets. Increased demand for Mangrove Crabs can cause disruption to the population of crabs in nature. This study to examine the morphometrics of Mud Crabs (Scylla sp.) Which include the size of the width of the Mud Crab carapace, the relationship between carapace width and weight, sex ratio, condition factors and the level of maturity of the Mud Crab in Bandengan Kendal waters from November 2018 to February 2019. The descriptive explorative methods was used in this research. The results showed that the number of mud crabs caught from November 2018 to February 2019 was 1914, consisting of 897 females and 1017 males, there were four species of mud crabs caught in Kendal Bandengan waters, namely Scylla serrata, Scylla tranquebarica, Scylla paramamosain and Scylla olivacea, comparison of females and males 1: 1,19. Carapace widths range from 43.75 - 165.5 mm with weights ranging from 23 - 660 g. The relationship between carapace width and weight are negative allometric. The obtained condition factor values range from 1.66 - 1.189. The maturity level of female crab gonads are dominated by TKG I and II, thus it is suspected that in November 2018 - February 2019 in the waters of Bandengan Kendal, the spawning peak has not yet occurred.
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Siahainenia, Laura, and Miftah Makatita. "ASPEK BIOEKOLOGI SEBAGAI DASAR PENGELOLAAN SUMBERDAYA KEPITING BAKAU (Scylla spp.) PADA EKOSISTEM MANGROVE PASSO." TRITON: Jurnal Manajemen Sumberdaya Perairan 16, no. 1 (April 30, 2020): 8–18. http://dx.doi.org/10.30598/tritonvol16issue1page8-18.
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Mud crabs have become an important commodity in Indonesia. The purpose of the research was to 1) analyze environmental conditions of the mud crabs habitat; 2) analyze the species compositions, sex ratio, reproduction status (size, period, and the reproduction site) of the mud crab; and 3) formulate management strategies for mud crabs (Scylla spp.) as well as their habitats. This Research was carried out in Passo mangrove ecosystem from August 2015-January 2016. Purposive sampling techniques was used to collect bio-ecological data of mud crabs whereas a structured interview was applied to obtain a management strategy data. The resust showed that the quality of Passo mangrove ecosystem is in good condition for the growth and survival of mud crabs. Four types of mud crabs were found with very low density. Sex ratio shifted from 1:1. Almost all individuals caught were in the reproductive phase with a carapace width of 10-15 cm. The peak of the reproductive season in January along the tidal channel, the mangrove forest front zone to the sea zone. This study recommend ten strategies in relation to the sustainability of the mangrove crab population and habitat preservation.
ABSTRAK
Kepiting bakau telah menjadi komoditas penting di Indonesia yang hidup di ekosistem mangrove. Penelitian ini bertujuan untuk 1) menganalisis kondisi lingkungan ekosistem mangrove Passo yang menjadi habitat alami kepiting bakau; 2) menganalisis komposisi jenis, kepadatan, rasio kelamin, status reproduksi, (ukuran, waktu dan lokasi reproduksi kepiting bakau; dan 3) merumuskan strategi pengelolaan sumberdaya kepiting bakau (Scylla spp.) serta habitatnya. Penelitian berlangsung di ekosistem mangrove Passo Teluk Ambon sejak Agustus 2015-Januari 2016. Pengumpulan data bioekologi kepiting bakau menggunakan metode purposive sampling, sedangkan strategi pengelolaan diperoleh melalui hasil wawancara terstruktur dengan masyarakat. Hasil penelitian menunjukkan kualitas lingkungan masih baik untuk pertumbuhan dan kelangsungan hidup kepiting bakau. Ditemukan empat jenis kepiting bakau dengan tingkat kepadatan yang sangat rendah. Rasio kelamin bergeser dari 1:1. Hampir semua individu yang tertangkap tergolong dalam fase reproduksi dengan ukuran lebar karapaks 10-15 cm. Puncak musim reproduksi pada bulan Januari di sepanjang alur pasang surut, zona depan hutan mangrove hingga zona laut. Terdapat sepuluh strategi pengelolaan yang direkomendasikan terkait keberlanjutan populasi kepiting bakau dan kelestarian habitat.
Kata kunci: Kepiting bakau, Scylla, ekosistem mangrove, pengelolaan, kepadatan
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Herlinah, Sulaeman, Gunarto, A. Parenrengi, and Rosmiati. "Effect of water salinity on survival and osmotic level of larval (Zoea Stage) of mud crabs Scylla tranquebarica." IOP Conference Series: Earth and Environmental Science 890, no. 1 (October 1, 2021): 012032. http://dx.doi.org/10.1088/1755-1315/890/1/012032.
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Abstract Mud crab of the genus Scylla are considered one of the most sought-after seafood today. This crab species has high quality and delicious aging growth rate and encourage expansion in the aquaculture sector especially in Southeast Asian Countries. However, salinity changes will cause changes in organisms osmotic pressure, and every aquatic biota has an optimal salinity range for survival. The study focuses on evaluating the effect of water salinity on the survival and osmotic levels of the purple mud crab, larvae of Scylla tranquebarica at the zoea stage. The LC50 assessment was performed in 10 different level of water salinity (0; 5; 10; 15; 20; 25; 30; 35, 40, and 50 ppt). Each treatment involved 20 ind./L of newly hatched crabs and being observed for 24 h in 10 different water salinity using 1 L volume glass container. The number of crab’s mortality were taken for each salinity regime. Larval behavior monitored during experiment. Meanwhile, the measurement of osmotic level was carried out at the salinity of 25, 30, and 35 ppt. The result shows that mud crab larvae exhibit any tolerance on the low salinity ranged from 0-10 ppt and the salinity of > 40 ppt. On the other hand, mud crab larvae were still able to survive at the salinity ranged from 20-40 ppt for more than 24 hours. The trend of the osmotic level of mud crab to survive is by hypo osmotic to iso osmotic.
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Belgrad, Benjamin A., and Blaine D. Griffen. "Predator–prey interactions mediated by prey personality and predator hunting mode." Proceedings of the Royal Society B: Biological Sciences 283, no. 1828 (April 13, 2016): 20160408. http://dx.doi.org/10.1098/rspb.2016.0408.
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Predator–prey interactions are important drivers in structuring ecological communities. However, despite widespread acknowledgement that individual behaviours and predator species regulate ecological processes, studies have yet to incorporate individual behavioural variations in a multipredator system. We quantified a prevalent predator avoidance behaviour to examine the simultaneous roles of prey personality and predator hunting mode in governing predator–prey interactions. Mud crabs, Panopeus herbstii , reduce their activity levels and increase their refuge use in the presence of predator cues. We measured mud crab mortality and consistent individual variations in the strength of this predator avoidance behaviour in the presence of predatory blue crabs, Callinectes sapidus , and toadfish, Opsanus tau . We found that prey personality and predator species significantly interacted to affect mortality with blue crabs primarily consuming bold mud crabs and toadfish preferentially selecting shy crabs. Additionally, the strength of the predator avoidance behaviour depended upon the predation risk from the predator species. Consequently, the personality composition of populations and predator hunting mode may be valuable predictors of both direct and indirect predator–prey interaction strength. These findings support theories postulating mechanisms for maintaining intraspecies diversity and have broad implications for community dynamics.
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Waiho, Khor, Hanafiah Fazhan, Henrik Glenner, and Mhd Ikhwanuddin. "Infestation of parasitic rhizocephalan barnacles Sacculina beauforti (Cirripedia, Rhizocephala) in edible mud crab, Scylla olivacea." PeerJ 5 (June 30, 2017): e3419. http://dx.doi.org/10.7717/peerj.3419.
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Screening of mud crab genus Scylla was conducted in four locations (Marudu Bay, Lundu, Taiping, Setiu) representing Malaysia. Scylla olivacea with abnormal primary and secondary sexual characters were prevalent (approximately 42.27% of the local screened S. olivacea population) in Marudu Bay, Sabah. A total of six different types of abnormalities were described. Crabs with type 1 and type 3 were immature males, type 2 and type 4 were mature males, type 5 were immature females and type 6 were mature females. The abdomen of all crabs with abnormalities were dented on both sides along the abdomen’s middle line. Abnormal crabs showed significant variation in their size, weight, abdomen width and/or gonopod or pleopod length compared to normal individuals. The mean body weight of abnormal crabs (type 1–5) were higher than normal crabs with smaller body size, while females with type 6 abnormality were always heavier than the normal counterparts at any given size. Sacculinid’s externa were observed in the abdomen of crabs with type 4 and type 6 abnormalities. The presence of embryos within the externa and subsequent molecular analysis of partial mitochondrial COI region confirmed the rhizocephalan parasite as Sacculina beauforti. Future in-depth descriptions of the life cycle and characteristics of S. beauforti are recommended as it involves a commercially important edible crab species and the effect on human health from the consumption of crabs is of crucial concern.
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Syafaat, Muhammad Nur, Mohamad Nor Azra, Khor Waiho, Hanafiah Fazhan, Ambok Bolong Abol-Munafi, Sairatul Dahlianis Ishak, Mohammad Syahnon, Azmie Ghazali, Hongyu Ma, and Mhd Ikhwanuddin. "A Review of the Nursery Culture of Mud Crabs, Genus Scylla: Current Progress and Future Directions." Animals 11, no. 7 (July 8, 2021): 2034. http://dx.doi.org/10.3390/ani11072034.
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The nursery stages of mud crab, genus Scylla, proceed from the megalopa stage to crablet instar stages. We review the definition and several of the key stages in mud crab nursery activities. The practice of the direct stocking of megalopa into ponds is not recommended due to their sensitivity. Instead, nursery rearing is needed to grow-out mud crabs of a larger size before pond stocking. Individual nursery rearing results in a higher survival rate at the expense of growth and a more complicated maintenance process compared with communal rearing. The nursery of mud crabs can be done both indoors or outdoors with adequate shelter and feed required to obtain a good survival percentage and growth performance. Artemia nauplii are still irreplaceable as nursery feed, particularly at the megalopa stage, while the survival rate may be improved if live feed is combined with artificial feed such as microbound diet formulations. Water quality parameters, identical to those proposed in tiger shrimp cultures, can be implemented in mud crab rearing. The transportation of crablets between different locations can be done with or without water. The provision of monosex seeds from mud crab hatcheries is expected to become commonplace, increasing seed price and thus improving the income of farmers. Numerous aspects of a mud crab nursery including nutrition; feeding strategies; understanding their behaviour, i.e., cannibalism; control of environmental factors and practical rearing techniques still need further improvement.
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Cheng, Changhong, Hongling Ma, Guangxin Liu, Sigang Fan, and Zhixun Guo. "Mechanism of Cadmium Exposure Induced Hepatotoxicity in the Mud Crab (Scylla paramamosain): Activation of Oxidative Stress and Nrf2 Signaling Pathway." Antioxidants 11, no. 5 (May 17, 2022): 978. http://dx.doi.org/10.3390/antiox11050978.
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Cadmium, one of the most toxic heavy metals, can cause severe oxidative damage to aquatic animals. However, the mechanism whereby the mud crabs respond to cadmium exposure remains unclear. This study investigated the effects of cadmium exposure on oxidative stress and histopathology changes and evaluated the role of the Nrf2 signaling pathway in regulating responses to cadmium-induced hepatotoxicity were investigated in mud crabs. Mud crabs were exposed to 0, 0.01, 0.05, and 0.125 mg/L cadmium for 21 d. The present results indicated that cadmium exposure increased hydrogen peroxide (H2O2) production, lipid peroxidation and tissue damage, but decreased the activity of superoxide dismutase (SOD) and catalase (CAT), and caused lipid peroxidation and tissue damage. The results of an integrated biomarker index analysis suggested that the toxicity of cadmium was positively related to cadmium concentration. The expression levels of the Nrf2 signaling pathway (Nrf2, metallothionein, and cytochrome P450 enzymes) were up-regulated after cadmium exposure. Silencing of Nrf2 in vivo decreased antioxidant gene (SOD, CAT, and glutathione S-transferase) expression, suggesting that Nrf2 can regulate antioxidant genes. Knocking down Nrf2 in vivo also significantly decreased the activity of SOD and CAT after cadmium exposure. Moreover, silencing of Nrf2 in vivo enhanced H2O2 production and the mortality rates of mud crabs after cadmium exposure. The present study indicated that cadmium exposure induced hepatotoxicity in the mud crab by increasing H2O2 content, which decreased the antioxidant capacity, leading to cell injury. In addition, the Nrf2 is activated to bound with antioxidant response element, initiating the expression of antioxidant enzyme genes during cadmium induced hepatotoxicity in the mud crabs.
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Kantun, Wayan, Warda Susaniati, and Muhammad Alwi. "POLA PERTUMBUHAN KEPITING BAKAU (Scylla serrata, Forskal 1775) YANG TERTANGKAP BUBU DI SUNGAI SANRANGANG, SULAWESI SELATAN." Marine Fisheries : Journal of Marine Fisheries Technology and Management 13, no. 1 (May 17, 2022): 45–57. http://dx.doi.org/10.29244/jmf.v13i1.38286.
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The local community has caught mud crabs for years and increased fishing pressures, leading to biological structure changes. Accordingly, studying the growth pattern, condition factors, and structure of mud crab in the Sanrangang River, Takalar Regency, South Sulawesi Province is necessary. This research was conducted from June to August 2020 in the Sanrangang River, Takalar Regency, South Sulawesi Province. This study compared the efficiency and effectiveness of three types of bubu, namely folding bubu, rakkang and wheel bubu based on the experimental fishing by using tilapia as the bait. Data were analyzed by Chi-Square non-parametric test. Results showed that the catch of mud crabs for folding bubu, rakkangs, and wheel bubu was 120; 107; and 110 species. The width and weight of mud crabs’ carapace caught by each bubu were as follows: from folding bubu ranged from 34.07 to 99.02 mm (60.34 ± 15.06 mm) and 21.62 to 389.57 g (92.41 ± 75.38 g); rakkang ranged from 35.09 to 98.51 mm (66.91 ± 13.95 mm) and 21.94-297.29 g (87.86 ± 34.35 g) and wheel bubu ranged from 34.21- 98.11 mm (66.32 ± 16.83 mm) and 22.01-485.45 g (102.17 ± 79.87 g). The growth patterns of the catch from all gear were negative allometric. The condition factors of folding bubu, rakkangs, and wheel bubu ranged from 0.40631-2.3998, 0.4598-2.4553 and 0.4962-3.1098 respectively. The gear producing the highest weight and the best condition factor was wheel bubu.
Keywords: Condition factor, mud crab, size structure, growth type.
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Rimalia, Anny, Yulius Kisworo, Bahrun Bahrun, Husinsyah Husinsyah, and Ahmad hidayat. "Identification of Bacteria as Health Indicators of Mangrove Crab (Scylla Serrata) at Farm Suppliers in South Kalimantan." International Journal of Environment, Agriculture and Biotechnology 7, no. 6 (2022): 001–6. http://dx.doi.org/10.22161/ijeab.76.1.
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This study aims to identify the types of pathogenic bacteria in mangrove crabs (Scylla serrata) and determine the health condition of mud crabs (Scylla serrata) at farm supply in South Kalimantan Province. The research method used is a case study, with sampling of mangrove crabs by purposive sampling at the farm supplier by considering the form supplier is already a legal entity, is still active in shipping and the frequency of shipments is quite a lot as well as continuous delivery to domestic and export destinations. For locations, sampling of mangrove crabs (Scylla serrata) was carried out at 3 (three) farm suppliers, namely CV. ACS in Banjarbaru City, CV. Three A's in Banjar Regency and UD. SLM in Banjarbaru City. For bacterial examination, it was repeated three times with the number of crab samples adjusted to the delivery population at the time of the study. The results showed that 15 mud crabs were infected with the pathogenic bacteria Plesiomonas sp (42%) followed by Actinobacillus sp. (39%), Vibrio sp. (16%) and Moraxella sp. (3%). The most common type of pathogenic bacteria infecting the farm supplier CV. ACS is a type of Actinobacillus sp. as many as 5 tails, while on the farm supplier CV. Three A are Plesiomonas sp. and Actinobacillus sp each as many as 5 tails and on farm supplier UD. SLM is a type of Plesiomonas sp as many as 6 tails. The condition of the mud crab (Scylla serrata) is declared physically healthy with the characteristics when the swimming legs are pulled away from the carapace and then released, the legs move quickly to their original position, the eye stalks are very responsive, that is, they enter the orbital area when touched, the mouth does not release foam, color The carapace is bright and does not have a bad smell and there are no pathogenic bacteria found in mud crabs that are harmful to the human body or safe for consumption.
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Chen, Cuiying, Xiaofeng Nie, Yu Cheng, Jiajian Shen, Xianda He, Shuqi Wang, Cuihong You, and Yuanyou Li. "Comparative analysis of growth performance, feed utilization, and antioxidant capacity of juvenile mud crab, Scylla paramamosain, reared at two different conditions." Crustaceana 94, no. 8 (September 10, 2021): 1021–33. http://dx.doi.org/10.1163/15685403-bja10153.
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Abstract This study was carried out to analyse the growth performance, feed utilization, and antioxidant capacity of juvenile mud crab (Scylla paramamosain) reared in two conditions. Here, a new indoor polypropylene tank culture system and a traditional outdoor pond cage facility were used to perform feeding experiments on juvenile crabs. After eight weeks, the survival rate, weight gain, moulting rate and feed efficiency of crabs cultured in polypropylene tanks were markedly higher than those cultured in pond cages. Moreover, the activities of serum acid phosphatase (ACP) and alkaline phosphatase (ALP), and the antioxidant indices including glutathione peroxidase (GSH-PX), glutathione transferase (GST), superoxide dismutase (SOD) and total antioxidant capacity (T-AOC) in hepatopancreas were higher in crabs cultured in the polypropylene tank system than those in pond cages. Based on these results, compared with the traditional pond cages, the polypropylene tank culture system is more suitable for the short-term culture of mud crabs.
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Sasamu, Aditya, Winda M. Mingkid, and Revol D. Monijung. "The Identification Of Morphometric Characteristics And Fattenning Of Mud Crabs (Scylla spp.) In Para Island, Tatoareng District, Sangihe Islands Regency, North Sulawesi Province." JURNAL ILMIAH PLATAX 7, no. 1 (October 31, 2018): 42. http://dx.doi.org/10.35800/jip.7.1.2019.21491.
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The purpose of this study was to identify the morphometric characters of mangrove crabs Scylla spp. and to grow them on the island of Para Sangihe Islands Regency, North Sulawesi Province. There were 2 types of crabs found during crab’s collection. However, the most abundant one was Scylla serrata while the olivacea is only one tail. The results of this study indicate that mangrove crabs that were kept for 2 weeks feed on trash fish three times a day experience growth. Based on the results of the study, it can be concluded that: the type of crab found on Pulau Para, Tatoareng District, Sangihe Islands Regency, North Sulawesi Province were mostly S. serrata (34 tails) and one tail of S. olivacea. The fattening of mangrove crabs showed results on the body weight and carapace length.Further research on mangrove crabs needs to be done on different aspects such as preferable food and time of the abundancy.Keywords: Crab, Scylla spp., identification, fattening. ABSTRAK Tujuan dari penelitian ini adalah untuk mengidentifikasi karakter morfometrik kepiting bakau Scylla spp dan cara penggemukannya di Pulau Para Kabupaten Kepulauan Sangihe Provinsi Sulawesi Utara. Dua jenis kepiting bakau ditemukan saat pengumpulan data, namun yang ditemukan paling banyak adalah Scylla serrata, sedangkan S. olivacea hanya 1 ekor saja.Hasil penelitian ini menunjukan bahwa kepiting bakau yang dipelihara selama 2 minggu dengan diberi pakan ikan rucah sebanyak tiga kali sehari mengalami pertumbuhan. Berdasarkan hasil penelitian dapat disimpulkan bahwa: jenis kepiting yang ditemukan di Pulau Para Kecamatan Tatoareng Kabupaten Kepulauan Sangihe Provinsi Sulawesi Utara adalah Scylla serrata (34 ekor) dan S. olivacea (1 ekor). Penggemukan kepiting bakau dengan pakan ikan rucah tiga kali sehari menunjukan adanya pertumbuhan berat badan dan panjang lebar karapas. Penelitian lanjutan tentang kepiting bakau perlu dilakukan untuk melihat berbagai aspek seperti makanan kesukaan dan waktu kelimpahanya.Kata kunci : Kepiting, Scylla spp, identifikasi, penggemukan.
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HARUN, NOR OMAIMA, NIK NUR SHAHIERA CHE ABDULLAH, and MHD IKHWANUDDIN ABDULLAH. "PEA CRAB DISTRIBUTION AND ITS MORPHOLOGICAL CHARACTERISTICS STUDIED IN BIVALVES FROM SETIU WETLANDS, TERENGGANU." Malaysian Applied Biology 49, no. 4 (December 25, 2020): 99–106. http://dx.doi.org/10.55230/mabjournal.v49i4.1598.
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Pea crab is a small crustacean known as kleptoparasite and belongs to the family Pinnotheridae, inhabit bivalves, gastropods, and other species. Nonetheless, pea crab is one of the unfamiliar species to the Malaysia citizen and the information is limited. This study aimed to determine the distribution of pea crab from four bivalves species (mud clam, oyster, hard clam and cockle) in Setiu Wetlands, Terengganu. Sampling was conducted twice, in October 2018 and February 2019, in which mud clam, oyster, cockle and hard clam were collected. In this study, the distribution of pea crab was observed by collecting randomly fifty samples of each bivalve at four sites and checked for any presence of pea crab. The size shell length of mud clams measured was 40 to 75 mm, oysters were 30 to 80 mm, marine clams and cockles were 20 to 40 mm. Pea crab presence was analysed and identified for the genus identification based on the microscopic and macroscopic methods. The result showed that, pea crab only present in the mud clam but none in other bivalves. Fifteen pea crabs were isolated from the first sampling (mean=0.3) with 11 females, whilst 13 pea crabs from the second sampling (mean=0.26) with 10 females- identified. The size of the pea crab measured was between 10 mm to 15 mm and belongs to the genus of Arcotheres sp. However, there were other none pea crab species were found in the oyster. On the other hand, the correlation between the carapace width of pea crab and mud clam shell length were analysed using linear regression (r²=0.0699, p=0.341) from first sampling, while (r²=0.2885, p=0.058) from second sampling. The size range of mud clams without pea crab was 35 to 60 mm shell length.
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Karim, Muhammad Yusri, Hasni Y. Azis, and Muslimin Muslimin. "PERTUMBUHAN KEPITING BAKAU Scylla olivacea DENGAN RASIO JANTAN-BETINA BERBEDA YANG DIPELIHARA PADA KAWASAN MANGROVE." Jurnal Perikanan Universitas Gadjah Mada 18, no. 1 (March 20, 2016): 1. http://dx.doi.org/10.22146/jfs.12593.
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Mudcrab fattening is potential to develop in mangrove areas. The aim of the present study was to determine the best ratio of male and female in fattening of mud crab in the mangrove area. Research was conducted in the mangrove areas of Pangkep Regency, South Sulawesi Province. Test animals used were mud crab S. olivacea male and female measuring weight of 250 ± 10 g and were stocked at a density of 10 animals/cage. The bamboo cages measuring length, width, and height of 1.0 x 1.0 x 1.0 m3 were placed in the mangrove areas. Feed used was trash fish at 10% of the biomass with the feeding frequency of two times a day ie morning (30%) and afternoon (70%). The study used a completely randomized design (CRD) consisting of 4 treatments and 3 replications. The ratio of male and female crabs were 7:3; 6:4; 5:5; 4:6 and 3:7 crabs/cage, respectively. Results of analysis of variance showed that the treatment with the different ratio of male and female was not significant (p> 0.05) on the survival rate of crab, but was highly significant (p <0.01) on the absolute and daily growth rate. The resulting survival rate ranges from 93.33 to 100%, absolute growth and the highest daily growth rate of crabs produced at a ratio of males and females (7:3) and (6:4) crabs/cage ie: 56.99 and 1.35; 56.25 g and 1.36%/day, while the lowest was in the ratio (3:7) crabs/cage ie: 28.97 g and 0.73%/day.
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Hassan, Ruhana. "Morphology and Genetic Diversity of Mud Crabs (Portunidae: Scylla) from Teluk Sulaman, Sabah, Malaysian Borneo." ASM Science Journal 12 (July 22, 2019): 1–9. http://dx.doi.org/10.32802/asmscj.2019.252.
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Teluk Sulaman, Sabah, is a secluded area that is rich in biological resources but with minimal biodiversity information. Small scale mud crab fisheries exist in Teluk Sulaman to support local livelihood, but there is a tendency of overfishing due to the increasing demand of this resource. The diversity of mud crab in Teluk Sulaman is still unknown. Information on the diversity of mud crab is vital, not only for conservation purpose but also to support the utilisation of this valuable resource sustainably. Therefore, this study aimed to identify the species of mud crabs in Teluk Sulaman, using morphological and molecular approaches. Based on morphological data, Teluk Sulaman only supports one species of mud crab, namely Scylla tranquebarica. The 460 bp 16S rRNA gene obtained in this study matched S. tranquebarica (GenBank Accession No.: KM258653.1), thus supported the conventional method of species identification. The phylogenetic trees agreed that S. tranquebarica is monophyletic. However, the relationship between S. serrata and S. olivacea remains unresolved. Future studies should explore spatial and temporal sampling besides using other genetic markers to further understand mud crab population in Teluk Sulaman further.
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Muttaqin, Ilham, Pande Gde Sasmita Julyantoro, and Alfi Hermawati Waskita Sari. "Identifikasi dan Predileksi Ektoparasit Kepiting Bakau (Scylla spp.) dari Ekosistem Mangrove Taman Hutan Raya (TAHURA) Ngurah Rai, Bali." Current Trends in Aquatic Science 1, no. 1 (August 30, 2018): 24. http://dx.doi.org/10.24843/ctas.2018.v01.i01.p04.
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This research aims to know the various types, predilections, prevalence and intensity of ectoparasites on mud crab (Scylla spp.) and water quality condition in Taman Hutan Raya (TAHURA) Ngurah Rai, Bali. This research was conducted in TAHURA mangrove ecosystem which has 219 hectare of research area near to Pemogan village from February to April 2018. The research used descriptive method by using random sampling for collecting data. Mud crabs obtained in this research consisted of 21 individual mud crabs that belong to 3 species, namely Scylla olivacea (11 ind), Scylla serrata (9 ind), and Scylla tranquebarica (1 ind). The observations results found 5 types of ectoparasites namely Zoothamnium sp. (2021 ind), Epistylis sp. (955 ind), Carchesium sp. (7 ind), Vorticella sp. (98 ind), and Octolasmis sp. (201 ind). Organs infected by ectoparasitic are legs (517 ind), swimming legs (476 ind), carapace (740 ind), claws (1348 ind), and gills (201 ind). The highest prevalence rate obtained was Zoothamnium sp. and Epistylis sp. about 95,23% while the lowest prevalence rate was Carchesium sp. about 4,76%. The highest level of intensity was Zoothamnium sp. about 101,05 ind/crab, while the lowest intensity obtained on Carchesium sp. with 7 ind/crab. The condition of water quality was still considered optimal for mud crab (Scylla spp.) life with average temperature of 29,9 ºC, dissolved oxygen 6,6 mg/L, salinity 20‰, and pH 7,39.
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Ferdoushi, Zannatul. "Seasonal assessment of existing mud crab (Scylla sp.) fattening practice in Bangladesh." Research in Agriculture Livestock and Fisheries 2, no. 1 (April 27, 2015): 135–41. http://dx.doi.org/10.3329/ralf.v2i1.23045.
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The present study was conducted in the southwest part of Bangladesh from 2008 to 2009 in order to assess of mud crab fattening practice and its production performance between two different seasons. Generally two crab fattening seasons are observed in Bangladesh, one is the dry or peak season (October to May) and another one is lean season or wet season (June to September). Significant variation in stocking density was observed between two seasons during the study period. Comparatively higher stocking density and higher production was found in dry season in comparison to wet season. The reasons behind higher production and production rate were; the availability of the crabs and high market price for the crabs during dry season. On the other hand, rain fall, occurrence of diseases and natural disaster might be the cause of lower production of crab during wet season. Crab farming and fishery could play a sustainable alternative employment opportunity for the development of coastal people. So government should take some necessary steps for the development of this fishery.Res. Agric., Livest. Fish.2(1): 135-141, April 2015
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Suman, Ali, Ap'idatul Hasanah, Khairul Amri, Andina Ramadhani Putri Pane, and Pratiwi Lestari. "POPULATION CHARACTERISTICS OF MUD CRAB (Scylla serrata) IN THE WATERS OF KENDARI BAY AND SURROUNDING AREAS." Indonesian Fisheries Research Journal 24, no. 2 (December 26, 2018): 117. http://dx.doi.org/10.15578/ifrj.24.2.2018.117-124.
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The high market demand for mud crabs (Scylla serrata) has caused intensive fishing for this resources and tended to threaten their sustainability. Studies of population characteristics are the main bases for formulating management measures for sustainable utilization. The purpose of this study was to determine the population characteristics of mud crabs in the waters of Kendari Bay and its surrounding waters. The study was conducted from January to November 2016 using survey method. The study results revealed that the mud crab growth pattern in Kendari Bay was negative allometric and that the ratio of males and females was imbalance. The length at first maturity (Lm) was at a carapace width of 109.8 mm. The growth rate (K) was 1.01 per year and the maximum carapace width (L) was 206 mm. The estimated total mortality rate (Z), fishing mortality rate (F), and natural mortality rate (M) were 3.20 per year, 2.17 per year, and 1.03 per year, respectively. The exploitation rate (E) was 0.68 per year. Therefore, the exploitation rate had reached 136%, which is categorized as overfishing. In order to ensure the sustainability of the mud crabs, there is needed to apply the precautionary approach, such as reducing fishing effort by 36% of the current situation.
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Jirapunpipat, Kanchana, Masashi Yokota, and Seiichi Watanabe. "The benefits of species-based management of sympatric mud crabs migrating to a common fishing ground." ICES Journal of Marine Science 66, no. 3 (January 19, 2009): 470–77. http://dx.doi.org/10.1093/icesjms/fsn221.
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Abstract Jirapunpipat, K., Yokota, M., and Watanabe, S. 2009. The benefits of species-based management of sympatric mud crabs migrating to a common fishing ground. – ICES Journal of Marine Science, 66: 470–477. The issue of effective fisheries management in sympatric species of mud crab of the genus Scylla on a local fishing ground is examined. A simple model is developed that allows the calculation of yield-per-recruit (YPR) based on deterministic body growth of two ideal coexisting crab species and their survival after migration to a fishing ground under two different fishing strategies. First, the basic strategy is traditional species-aggregated fishing, which does not distinguish the start of fishing and fishing effort among species. Therefore, the species-aggregated fishing strategy can be treated as if only a single species existed despite the coexistence of separate crab species on the fishing ground. This is in common use, because species discrimination of mud crabs is difficult. Second, an alternative strategy of species-based fishing is proposed, in which two fishing parameters are controlled depending on the demographic variables of each species. The application of the model to several combinations of individual growth rate (k) and natural mortality (M) between two species demonstrates that YPR for species-based management is larger than for species-aggregated fishing. Numerical simulations suggest that species-based fishing is advantageous even when fishing is controlled for only one species and the parameters of the other species are unknown. These findings could be applied not only to the effective management of sympatric mud crabs, but also to other overlapping species.
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Wong, RJ, MS Roy, and JEK Byrnes. "Sediment selection: range-expanding fiddler crabs are better burrowers than their historic-range counterparts." Marine Ecology Progress Series 674 (September 16, 2021): 163–71. http://dx.doi.org/10.3354/meps13811.
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Climate change plays a large role in driving species range shifts; however, the physical characteristics of an environment can also influence and alter species distributions. In New England salt marshes, the mud fiddler crab Minuca pugnax is expanding its range north of Cape Cod, MA, into the Gulf of Maine (GoM) due to warming waters. The burrowing lifestyle of M. pugnax means sediment compaction in salt marshes may influence the ability of crabs to dig, with more compact soils being resistant to burrowing. Previous studies indicate that salt marshes along the GoM have a higher sediment compaction relative to marshes south of Cape Cod. Physical characteristics of this habitat may be influencing the burrowing performance of M. pugnax and therefore the continuation of their northward range expansion into the GoM. We conducted a controlled laboratory experiment to determine if compaction affects the burrowing activity of M. pugnax in historical and range-expanded populations. We manipulated sediment compaction in standardized lab assays and measured crab burrowing performance with individuals collected from Nantucket (NAN, i.e. historical range) and the Plum Island Estuary (PIE, i.e. expanded range). We determined compaction negatively affected burrowing ability in crabs from both sites; however, crabs from PIE have a higher probability of burrowing in higher sediment compactions than NAN crabs. In addition, PIE crabs were more likely to burrow overall. We conclude that site level differences in compaction are likely altering burrowing behavior in the crab’s expanded-range territory by way of local adaptation or phenotypic plasticity.
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Romadhon, Achmad, Eva Prasetiyono, and Arthur Muhammad Farhaby. "Laju Pertumbuhan Dan Kecepatan Molting Kepiting Bakau (Scylla serrata) Dengan Pemberian Ekstrak Daun Pakis Hutan (Diplazium caudatum)." Journal of Tropical Marine Science 5, no. 1 (January 10, 2022): 9–18. http://dx.doi.org/10.33019/jour.trop.mar.sci.v5i1.2312.
Full textAbstract:
The cultivation of mud crabs is growing to get crabs in the soft shell condition. But most of the soft shell crab's farmers do not experience sustainable business. The main obstacle is the length of the maintenance period and moulting time does not unison thereby causing the feed and operating costs to be high. The research aimed to examine the effect of injection with forest fern leaf extract on growth rate and moulting speed of mangrove crabs (Scylla serrata) and determine the best dose in the process of injecting forest Fern Leaf extract for mangrove crab (Scylla serrata). Treatment of mangrove crab (Scylla serrata) weight ± 100 g with dose: P1 (NaCL 0.9%) P2 (50 mg.L-1) P3 (75 mg.L-1) P4 (100 mg.L-1) P5 (125 mg.L-1) 5 crabs each are cared for 30 days, The research was conducted using a single complete random draft (RAL), the results of various analyses showed the significant forest fern leaf extract against the growth of absolute weights, the rate of Specific growth, and relative growth, but no noticeable effect for molting speed and absolute length growth. The results of this research showed that a dose of 125 mg.L-1produces the highest value with result for moulting speed of 0.50 ± 0.57, length absolute growth of 0.37 ± 0.1 weighted absolute growth of 20 ± 5,74, specific growth rate of 0.54 ± 0.13, and relative growth of 0.64 ± 0.18.