Artykuły w czasopismach na temat „Mud crab”
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Samidjan, Istiyanto, Diana Rachmawati i Putut Har Riyadi. "Development of Polyculture Engineering Technology on Milkfish and Mud Crab Farming". Pertanika Journal of Tropical Agricultural Science 45, nr 2 (22.03.2022): 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., i Chet F. Rakocinski. "Destabilizing effects on a classic tri-trophic oyster-reef cascade". PLOS ONE 15, nr 12 (15.12.2020): 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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Wan Yusof, Wan Roslina, Fasihuddin Badruddin Ahmad i 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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Sayeed, Zubayer, Hiroaki Sugino, Yutaro Sakai i Nobuyuki Yagi. "Consumer Preferences and Willingness to Pay for Mud Crabs in Southeast Asian Countries: A Discrete Choice Experiment". Foods 10, nr 11 (19.11.2021): 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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Iromo, Heppi, Zainuddin i dan Syawaluddin. "Study of Mud Crab Species (Scylla Spp.) In Brackish Waters North Kalimantan Province". IOP Conference Series: Earth and Environmental Science 1083, nr 1 (1.09.2022): 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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Purna, Selobing, Misbakhul Munir i 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, nr 1 (16.02.2021): 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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Das, Kumar Prasun, Subrata Mondal i 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, nr 4 (3.02.2020): 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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Poulin, Remington X., Serge Lavoie, Katherine Siegel, David A. Gaul, Marc J. Weissburg i Julia Kubanek. "Chemical encoding of risk perception and predator detection among estuarine invertebrates". Proceedings of the National Academy of Sciences 115, nr 4 (8.01.2018): 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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HARUN, NOR OMAIMA, NIK NUR SHAHIERA CHE ABDULLAH i MHD IKHWANUDDIN ABDULLAH. "PEA CRAB DISTRIBUTION AND ITS MORPHOLOGICAL CHARACTERISTICS STUDIED IN BIVALVES FROM SETIU WETLANDS, TERENGGANU". Malaysian Applied Biology 49, nr 4 (25.12.2020): 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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Gita, Rina Sugiarti Dwi, Sudarmadji Sudarmadji i 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, nr 2 (22.11.2016): 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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Duarte, Rafael C., Gustavo M. Dias, Augusto A. V. Flores i Martin Stevens. "Different ontogenetic trajectories of body colour, pattern and crypsis in two sympatric intertidal crab species". Biological Journal of the Linnean Society 132, nr 1 (25.11.2020): 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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Pane, Andina Ramadhani Putri, Reza Alnanda i 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, nr 1 (10.08.2020): 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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Dwi Hapsari, Trisnani, Azis Nur Bambang, Abdul Ghofar i 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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Syafaat, Muhammad Nur, Mohamad Nor Azra, Khor Waiho, Hanafiah Fazhan, Ambok Bolong Abol-Munafi, Sairatul Dahlianis Ishak, Mohammad Syahnon, Azmie Ghazali, Hongyu Ma i Mhd Ikhwanuddin. "A Review of the Nursery Culture of Mud Crabs, Genus Scylla: Current Progress and Future Directions". Animals 11, nr 7 (8.07.2021): 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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Hastuti, Yuni Puji, Arul Tabah Prastomo, Ridwan Affandi, Wildan Nurussalam, Dudi Muhammad Wildan i 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, nr 3 (31.12.2020): 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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Hassan, Ruhana. "Morphology and Genetic Diversity of Mud Crabs (Portunidae: Scylla) from Teluk Sulaman, Sabah, Malaysian Borneo". ASM Science Journal 12 (22.07.2019): 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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Suherman, Sutianto Pratama, Rahmatiya Marjan i Arafik Lamadi. "Octolasmic Octolasmis spp. parasite attack on mudcrab Scylla serrata in Tomini Bay". Tomini Journal of Aquatic Science 3, nr 2 (14.11.2022): 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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Panatar, Jakfar Shodiq, Ali Djunaedi i Sri Redjeki. "Studi Morfometrik Kepiting Bakau (Scylla serrate) Forsskål, 1775 (Malacostraca : Portunidae) di Kecamatan Wedung, Demak, Jawa Tengah". Journal of Marine Research 9, nr 4 (26.11.2020): 495–500. http://dx.doi.org/10.14710/jmr.v9i4.25960.
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ABSTRAK : Kepiting bakau (Scylla serrata) adalah jenis kepiting yang hidup di perairan pantai, tambak, dan hutan bakau (mangrove). Kepiting bakau (Scylla serrata) merupakan komoditas ekspor bernilai ekonomis tinggi yang sangat potensial untuk dikembangkan dan memiliki nilai ekonomis yang tinggi di Indonesia, terutama kepiting yang sudah dewasa serta gemuk. Tujuan penelitian ini adalah untuk mengetahui karakteristik morfometrik kepiting bakau (Scylla serrata) seperti kelimpahan relatif kepiting bakau (Scylla serrata), distribusi lebar karapas, dan hubungan lebar karapas – berat kepiting bakau (Scylla serrata). Analisis yang digunakan dalam penelitian ini yaitu kelimpahan realatif kepiting dan analisis regresi. Penelitian ini dilaksanakan pada bulan Februari – April 2019 di Kecamatan Wedung, Demak. Materi yang digunakan pada penelitian ini adalah sampel kepiting bakau (Scylla serrata) hasil tangkapan nelayan di daerah tersebut. Kepiting bakau hasil tangkapan nelayan tersebut dihitung jumlahnya, diidentifikasi jenis kelaminnya, diukur lebar karapas dan ditimbang beratnya. Hasil penelitian menunjukkan bahwa Kepiting bakau (Scylla serrata) yang tertangkap pada bulan Februari – April 2019 diperoleh 300 individu yang terdiri dari 202 jantan dan 98 betina. Rata – rata ukuran lebar karapas tertinggi berkisar 9.8 cm pada hasil tangkapan di bulan Februari. Hubungan lebar karapas – berat Kepiting bakau (Scylla serrata) baik jantan maupun betina menunjukkan pola pertumbuhan allometrik negatif. ABSTRACT : Giant mud crab (Scylla serrata) are types of crabs that live in coastal waters, ponds, and mangrove forests. Giant mud crab (Scylla serrata) is a high economic value export commodity that has the potential to be developed and has high economic value in Indonesia, especially crabs that are mature and fat. The purpose of this study was to determine the morphometric characteristics of giant mud crab (Scylla serrata) such as relative abundance of giant mud crab (Scylla serrata), carapace width distribution, and the relationship between carapace width - weight of giant mud crab (Scylla serrata). The analysis used in this study is the relative abundance of giant mud crab and regression analysis. This research was conducted in February - April 2019 in the subdistrict of Wedung, Demak. The material used in this study was a sample of giant mud crab (Scylla serrata) from the fishermen catch in the area. The giant mud crab captured by the fishermen are counted, identified by sex, measured in carapace width and weighed. The results showed that giant mud crab (Scylla serrata) caught in February - April 2019 obtained 300 individuals consisting of 202 males and 98 females. The highest average carapace width ranges from 9.8 cm in catches in February. Relationship between carapace and weight of giant mud crab (Scylla serrata) both male and female showed negative allometric growth patterns.
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Xie, J., H. Mei, S. Jin, L. Bu, X. Wang, C. Wang, Q. Zhao, R. Ma i S. Zhou. "Outbreak of vibriosis associated with Vibrio parahaemolyticus in the mud crab Scylla paramamosain cultured in China". Diseases of Aquatic Organisms 144 (27.05.2021): 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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Ye, Shaopan, Xiaoyan Yu, Huiying Chen, Yin Zhang, Qingyang Wu, Huaqiang Tan, Jun Song i in. "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, nr 7 (7.07.2022): 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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Yudiati, Ervia, Arumning Tias Fauziah, Irwani Irwani, Agus Setyawan i 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, nr 1 (13.02.2020): 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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Suwirya, Ketut, Muhamad Marzuqi i I. Nyoman Adiasmara Giri. "EFFECT OF DIETARY CASSAVA MEAL ON GROWTH OF MUD CRAB, Scylla paramamosain". Indonesian Aquaculture Journal 2, nr 2 (31.12.2007): 121. http://dx.doi.org/10.15578/iaj.2.2.2007.121-125.
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<p>It is widely recognized that a major constraint to development of a mud crab aquaculture industry is the availability and formulation nutritionally adequate but relatively low cost diets. Development of artificial diets, which seek to minimize inclusion of expensive feed ingredients such as fish and terrestrial meals, is considered to be a priority for improving the profitability of this emerging industry. Typically, carbohydrates such as starches are relatively cheap and therefore offer opportunity to supply dietary energy at low cost. The study examines the capacity of mud crab, <em>Scylla paramamosain</em> to utilize a range of dietary cassava meal as carbohydrate source. Four levels of cassava meal were used at inclusion levels of 0%, 10%, 20%, and 30% in diets. Mud crabs will readily accept the diet containing relatively high levels of cassava meal. This experiment proved that mud crab which fed 10% dietary cassava meal gains weight more than the one fed diet without dietary cassava meal. The increasing level of cassava meal to more than 10% in diet reduced final weight and weight gain. To some extent, mud crab, <em>Scylla paramamosain</em> is capable to use dietary carbohydrate from cassava meal. The finding raises the possibility to include 10% cassava meal in formulation low cost diet for mud crab.</p>
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Munana, Nila, Irwani Irwani i Widianingsih Widianingsih. "Pola Pertumbuhan Kepiting Bakau (Scylla serrata) Di Perairan Desa Bandengan Kendal". Journal of Marine Research 10, nr 1 (14.02.2021): 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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Sarower, M. G., S. Bilkis, M. A. Rauf, M. Khanom i M. S. Islam. "Comparative Biochemical Composition of Natural and Fattened Mud Crab Scylla serrata". Journal of Scientific Research 5, nr 3 (29.08.2013): 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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Syahputra, Faisal, Safrizal Safrizal i Chaliluddin Chaliluddin. "Pola Sebaran Kepiting Bakau Dengan Alat Tangkap Bubu Di Perairan Payau Sungai Tanjung Keramat Kecamatan Banda Mulia Kabupaten Aceh Tamiang". Jurnal TILAPIA 2, nr 2 (30.07.2021): 63–72. http://dx.doi.org/10.30601/tilapia.v2i2.1925.
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Mud crab (Scylla spp.) is a fisheries commodity that is able to adapt strongly to mangrove forests and has a wide distribution area. The wide spread of mud crab is due to the fact that mud crab have a wide tolerance to abiotic factors, especially temperature and salinity. This study aims to determine the composition of the catch and the distribution pattern of mud crab (Scylla spp.) in the waters of the Gampong Tanjung Keramat River, Banda Mulia District, Aceh Tamiang Regency. Sampling was carried out randomly using purposive sampling method at three observation stations including Station 1 (mangrove ecosystem in the river mouth), Station 2 (in the middle of river in the mangrove ecosystem), and Station 3 (in the middle of the mangrove ecosystem). The results showed that the mud crab that were caught using traps consisted of one species, Scylla serrata, with the ratio of male and female mud crab yield is 1.5: 1 (6 males and 4 females). The body size of mud crab varies with the length range of male mud crab, namely 5.2 cm - 8.1 cm, the length of female mud crab is 5 cm - 7 cm. While the range of male mud crab widths is 6.7 cm - 9.6 cm, the width of female mud crab is 5 cm - 8.8 cm. The body weight of male mud crab is 80 g - 350 g, while the body weight of female crab is 90 g - 150 g. Distribution pattern of Scylla spp. located in 3 locations with 9 points of trap/ bubu operation spread over 3 stations. The distribution locations of mud crab are: mangrove ecosystem, river flow in the middle of mangrove ecosystem, and in the middle of river flow of mangrove ecosystem.
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Noviani, Ertika, Sulistiono Sulistiono i Agustinus Mangaratua Samosir. "Heavy Metal (Pb, Hg) Extent in Mud Crab (Scylla serrata) in Cengkok Coastal Waters, Banten Bay, Indonesia". Omni-Akuatika 16, nr 2 (31.12.2020): 108. http://dx.doi.org/10.20884/1.oa.2020.16.2.810.
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Banten Bay is located in the north of Java Island and influenced by anthropogenic activities around the bay. Increasing population growth and rapid development of industrial and urban activities around the waters of the Banten Bay can lead to an increased input of pollutants in the form of heavy metal in the water body. This study aims to analyze the Pb and Hg levels that accumulate in mud crab (Scylla serrata) in Cengkok coastal waters, Banten Province. Samples of the mud crabs were taken in the waters for six months, from March to August 2019. Analysis of heavy metal concentrations was carried out using the Atomic Absorption Spectrophotometric (AAS) AA 7000 series Shimadzu. Heavy metal (Pb and Hg) in the mud crab in Banten Bay were below the specified quality standard. The bio-concentration factor of the mud crab was low (<100). Results of the calculation of the maximum limit of consumption of the mud crab meat (that accumulates heavy metals in the human body) were 3.5 kg of meat/week for adults and 0.9 kg of meat/week for children.Keywords: Crustacean, pollution, limit of consumption.
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Herlinah, Sulaeman, Gunarto, A. Parenrengi i 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, nr 1 (1.10.2021): 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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Muttaqin, Ilham, Pande Gde Sasmita Julyantoro i 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, nr 1 (30.08.2018): 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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Fatryani, Dita, Sulistiono i Djamar TF Lumban Batu. "Heavy Metal Contents of Hg, Cd, Pb, and Cu in Mud Crab (Scylla Serrata) in Banten Bay, Indonesia". IOP Conference Series: Earth and Environmental Science 1083, nr 1 (1.09.2022): 012057. http://dx.doi.org/10.1088/1755-1315/1083/1/012057.
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Abstract The development of industry and residential areas around the waters of Banten Bay can increase the input of heavy metal waste and cause accumulation in aquatic biota, especially in mud crab (Scylla serrata). This study aims to determine the level of accumulation of heavy metals (Hg, Cd, Pb, and Cu) contained in mud crab meat in Bojonegara Coastal Waters, Banten Bay. Sampling of the mud crabs was carried out monthly for three months, from August to October 2020 in the waters. The research method consists of the calculation of Bioconcentration Factor (BCF), Maximum Weekly Intake (MWI), and Maximum Tolerable Intake (MTI). According to the analysis, content of heavy metals Hg, Cd, and Pb in mud crab was under the AAS sensitivity value used, which was <0.001 mg/kg, <0.005 mg/kg, <0.030 mg/kg, respectively, while for heavy metal Cu ranged from 4.44 to 13.52 mg/kg. The bioconcentration factor of the heavy metals Hg, Cd, and Pb in the water was classified as low accumulation, while heavy metal Cu in water was classified as medium to high accumulation. The safe limit for consumption of the mud crab meat taken in the waters was 12.94 kg meat/week (adults) and 3.88 kg meat/week (children).
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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, nr 1 (27.04.2015): 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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Maldini, Audi, Winaruddin Winaruddin, Muttaqien Bakri, Muhammad Hambal, Farida Farida i Razali Daud. "19. Identification of Ectoparasites in the Mud Crab (Scylla serrata) from Alue Naga Coastal Waters Banda Aceh". Jurnal Medika Veterinaria 11, nr 2 (20.10.2017): 114–17. http://dx.doi.org/10.21157/j.med.vet..v11i2.5156.
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This study aimsed to determine the type of ectoparasites on crab (Scylla serrata) in the water of Alue Naga Banda Aceh. The samples of this study were 10 heads of mud crabs were taken from the Alue Naga waters Banda Aceh and taken to the Laboratory of Parasitology. Veterinary Medicine Faculty of Syiah Kuala University Banda Aceh to identify the take ectoparasites on mud crab (Scylla serrata) by observing the outer body of the organism, then noted bleeding, wounds or swelling and pay attention to the type of organism that is attached to the body of mud crab, then dredge the outer parts of the body like the carapace, foot path, foot pool and gills were take it and then tweezers and then putting the object glass that has been provided and observed with a microscope with 100 times magnification and see what kind of ectoparasites that have been found and then compare with the identification key. From the results of this study concluded that ectoparasites which infects mud crab (Scylla serrata) in the waters of Alue Naga Banda Aceh come from genus Chilodonella sp. Whichare predilections in the gills with a prevalence rate of 10%.
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Pratiwi, Rianta, Sukristijono Sukardjo, Ernawati Widyastuti i 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, nr 3 (1.09.2022): 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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Kawamura, Gunzo, Chi Keong Loke, Leong Seng Lim, Annita Seok Kian Yong i Saleem Mustafa. "Chemosensitivity and role of swimming legs of mud crab,Scylla paramamosain,in feeding activity as determined by electrocardiographic and behavioural observations". PeerJ 9 (21.04.2021): e11248. http://dx.doi.org/10.7717/peerj.11248.
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Swimming crabs have a characteristic fifth pair of legs that are flattened into paddles for swimming purposes. The dactyl of these legs bears a thick seta along its edge. The chemoreceptive and feeding properties of the seta are supported with scientific evidence; however, there is no available data on the sensitivity of the setae in portunid crabs. The underlying mechanisms of the chemo- and mechano-sensitivity of appendages and their involvement in feeding activities of the mud crab (Scylla paramamosain) were investigated using electrocardiography and behavioural assay, which focused on the responses of the mud crab to chemical and touch stimulus. Electrocardiography revealed the sensory properties of the appendages. The dactyls of swimming legs and the antennules were chemosensitive, but not mechanosensitive and vice versa for the antennae. However, the mouthparts, claws, and walking legs were chemo- and mechanosensitive. Only the chemosensitive appendages, including the swimming legs, were directly involved in feeding. The flattened dactyls of the swimming legs were more efficient than the pointed dactyls of the walking legs in detecting the food organism crawling on the substrate. The structural features enhanced the capacity of the crab in coming into contact with scattered food items. This study revealed that the swimming legs are important appendages for feeding in the mud crab.
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Eddiwan, T. Dahril, Adriman, Budijono, Efawani i Y. Harjoyudanto. "Study of Growth and Survival of Mud Crab (Scylla serrata, Forskal) with Different Salinity Levels in culture media". IOP Conference Series: Earth and Environmental Science 934, nr 1 (1.11.2021): 012015. http://dx.doi.org/10.1088/1755-1315/934/1/012015.
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Abstract The aim of this study to find out the optimal level of salinity for the growth and survival of the mud crab (Scylla serrata). The weight of crab seeds were about 47.65-51.32 grams and the carapace length ranged from 64.35-71.30 mm, then put into 12 tanks (1 m x 1 m x 0.4 m) with a density of 4 crab seed per tank. During the maintenance of this test, mangrove crab was fed with fresh chicken intestines as much as 10% of its body weight per day. Water changes are carried out more than 150% per week. At the beginning of the experiment, each tank was conditioned to the same water salinity in all experimental units, namely 33 ppt. To see the effect of differences in salinity levels on the growth and survival of mud crabs, 4 treatments were made consisting of (A) 33 ppt salt content, (B) 31 ppt salt content, (C). The salt content is 29 ppt, and (D) the salt content is 27 ppt. From the results of this experiment, it is known that a decrease in the salt content of 4 ppt is the best treatment for the growth of mud crabs, but has no effect on the survival value.
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Jennings, Lucas A., April M. H. Blakeslee, Krista A. McCoy, Donald C. Behringer i Jamie Bojko. "Systematic assessment of the Panopeidae and broader Eubrachyura (Decapoda: Brachyura) using mitochondrial genomics". Arthropod Systematics & Phylogeny 79 (23.11.2021): 569–85. http://dx.doi.org/10.3897/asp.79.e70234.
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Abstract This study provides a broad phylogenetic analysis for the Eubrachyura, with the inclusion of three new Panopeidae mitochondrial genomes: Eurypanopeus depressus (flatback mud crab) (15,854bp), Panopeus herbstii (Atlantic mud crab) (15,812bp) and Rhithropanopeus harrisii (Harris, or ‘white-fingered’ mud crab) (15,892bp). These new mitogenomes were analyzed alongside all available brachyuran mitochondrial genomes (n = 113), comprising 80 genera from 29 families, to provide an updated phylogenetic analysis of the infra-order Brachyura (“true crabs”). Our analyses support the subsection Potamoida within the Eubrachyura as the sister group to Thoracotremata. The family Panopeidae aligns with the family Xanthidae to form the Xanthoidea branch, which is supported by current morphological and genetic taxonomy. A unique gene arrangement termed ‘XanGO’ was identified for the panopeids and varies relative to other members of the subsection Heterotremata (within the Eubrachyura) via a transposition of the trnV gene. This gene arrangement is novel and is shared between several Xanthoidea species, including Etisus anaglyptus (hairy spooner crab), Atergatis floridus (brown egg crab), and Atergatis integerrimus (red egg crab), suggesting that it is a conserved gene arrangement within the Xanthoidea superfamily. Our study further reveals a need for taxonomic revision of some brachyuran groups, particularly the Sesarmidae. The inclusion of panopeid mitogenomes into the greater brachyuran phylogeny increases our understanding of crab evolution and higher level Eubrachyuran systematics.
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Siahainenia, Laura, i Debby A. J. Selanno. "PERFORMA DAN KARAKTER MORFOLOGIS KEPITING BAKAU YANG TERPAPAR LOGAM BERAT DI EKOSISTEM MANGROVE PASSO". TRITON: Jurnal Manajemen Sumberdaya Perairan 18, nr 2 (31.10.2022): 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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Iromo, Heppi, Dori Rachmawani, Abdul Jabarsyah i Zainuddin Zainuddin. "Utilization of Trash Fish for Cultivation of Crablet Mud Crab (Scylla serrata)". ILMU KELAUTAN: Indonesian Journal of Marine Sciences 25, nr 3 (12.04.2020): 110–14. http://dx.doi.org/10.14710/ik.ijms.25.3.110-114.
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The high demand for mud crabs in North Kalimantan causes catch to increase in the wild. If it is not balanced with efforts to increase its aquaculture of mud crab, in the future there will be a decline in population. This study aims to determine the growth and survival rate of mud crab seed (crablet, Scylla serrata) in the application method of different types of trash fish. This research used a completely randomized design with 4 treatments and 3 replications. The Crablet used carapace width average 0.07-0.09 cm and weigh average 0.05-0.07 g with total 150 crablets. The treatments applied by trash fish were (A) Tilapia Fish (Oreochromis mossambicus), (B) Longfin Herrings Fish (Ilisha elongata), (C) Sword Fish (Trichiurus lepturus) and (D) Snails (Telescopium telescopium). The results were The best weight growth of crablet occurs in the treatment of T. lepturus (P>0.05) and the highest of survival rates of crablet were found in treatment T. telescopium (P<0.05) than the other. The trash fish were used turned out to be able survival of crablet mud crab (Scylla serrata).
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Mwaluma, James M., i 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, nr 1 (2.01.2021): 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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Altieri, Andrew H., i Andrew D. Irving. "Species coexistence and the superior ability of an invasive species to exploit a facilitation cascade habitat". PeerJ 5 (21.02.2017): 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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Lan, Nguyen Phuong, Do Thi Thanh Trung, Van Thu Vu i 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, nr 3 (28.11.2020): 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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Syam, Amran Ronny, Suwarso Suwarso i Sri Endah Purnamaningtyas. "LAJU EKSPLOITASI KEPITING BAKAU (Scylla serrata) DI PERAIRAN MANGROVE MAYANGAN, SUBANG – JAWA BARAT". Jurnal Penelitian Perikanan Indonesia 17, nr 3 (30.01.2017): 201. http://dx.doi.org/10.15578/jppi.17.3.2011.201-207.
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Penelitian tentang dinamika populasi kepiting bakau (Scylla serrata) telah dilaksanakan di perairan mangrove Mayangan, Kecamatan Legonwetan, Kabupaten Subang, Jawa Barat. Contoh kepiting diambilsecara acak dari hasil tangkapan bubu. Data sebaran frekuensi lebar karapas dikumpulkan selama sebelas bulan pengamatan. Analisis data parameter populasi dilakukan dengan bantuan software FISAT (FAO ICLARMStock Assessment Tools). Hasil analisis menunjukkan terdapat beberapa kelompok umur/ukuran kepiting bakau. Lebar karapas asimptotik populasi kepiting bakau mencapai 147 mm dengan koefisien pertumbuhan tahunan (K) 0,59. Laju eksploitasi kepiting bakau (E = 0,4) masih di bawah laju eksploitasi optimum. Hasil tangkapan kepiting bakau mencapai 23,8 ton per tahun. Hasil pengukuran di lapangan menunjukkan bahwa 70% berupa kepiting muda (nama lokal “keroyo”). Kondisi ini (growth over fishing) akan semakin mengkhawatirkan jika penangkapan berlangsung terus. Kondisi lingkungan perairan di sekitar mangrove dan perairan pantai cukup menunjang kehidupan biota termasuk larva kepiting bakau dan larva biota lain. Research on population dynamics of mud crab (Scylla serrata) was conducted in mangrove waters Mayangan, District Legonwetan, Subang regency, West Java. The current work was done based on carapace width frequency distribution data collected during eleven months of observation. The crab samples were taken randomly from the catch of trap net. Analysis was using software FISAT (FAOICLARM Stock Assessment Tools). Results show that there were several groups of age / size of mud crabs. Asymptotic length of mud crab population has reached 147 mm (carapace width) with an annual growth curvature (K) 0.59. Exploitation rate (E = 0.4) Of the mud crab population wos under the optimum level. Total undercrab production reached 23.8 tonnes per year, where most of the catch (88%) was of Scylla serrata. The results of field measurements was approximately 7 % of young crabs (local name “keroyo”). This condition of growth over fishing has occurred. It will be more worried if this condition continues. Environmental condition of the waters around mangroves and coastal waters seems be povurable to support the life animal including mud crab larvae and other animals larvae.
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Tirtadanu, Tirtadanu, i Umi Chodrijah. "PARAMETER POPULASI DAN TINGKAT PEMANFAATAN KEPITING BAKAU (Scylla serrata Forsskal, 1775) DI PERAIRAN SEBATIK, KALIMANTAN UTARA". Jurnal Penelitian Perikanan Indonesia 24, nr 3 (8.10.2018): 187. http://dx.doi.org/10.15578/jppi.24.3.2018.187-196.
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Salah satu informasi yang diperlukan untuk merumuskan pengelolaan kepiting bakau (Scylla serrata Forsskal, 1775) yang berkelanjutan adalah parameter populasi dan tingkat pemanfaatannya. Penelitian ini bertujuan untuk mengkaji parameter populasi dan tingkat pemanfaatan kepiting bakau di perairan Sebatik. Penelitian dilakukan pada Maret-Desember 2017. Sampel kepiting bakau di peroleh dari hasil tangkapan nelayan dengan alat tangkap bubu di perairan Sebatik. Pertumbuhan dianalisis berdasarkan persamaan Von Bertalanffy dengan mengamati pergeseran struktur ukuran kepiting tiap bulan dan tingkat pemanfaatan diperoleh dari metode kurva konversi panjang dengan hasil tangkapan. Hasil penelitian menunjukkan kepiting bakau yang tertangkap bubu di perairan Sebatik berukuran lebar karapas (carapace width) antara 84-144 mmCW dengan rata-rata ukuran yang tertangkap adalah 107,05±12,3 mmCW pada kepiting jantan dan 110,2±8,86 mmCW pada kepiting betina. Pertumbuhan berat kepiting bakau jantan lebih cepat dibandingkan ukurannya (b=3,6) sebaliknya pertumbuhan berat kepiting bakau betina lebih lambat dibandingkan ukurannya (b=2,5). Nisbah kelamin kepiting bakau menunjukkan kondisi tidak seimbang (5,5 : 1) dengan proporsi jantan lebih dominan dibandingkan betina. Lebar karapas asimptotik (CW) kepiting bakau jantan adalah 151,2 mmCW dan betina adalah 140,5 mmCW. Laju pertumbuhan (K) kepiting bakau adalah 0,75 tahun-1 pada kepiting jantan dan 0,79 tahun-1 pada kepiting betina. Status pemanfaatan kepiting bakau telah berada dalam tahapan mendekati lebih tangkap (E=0,5-0,55) sehingga disarankan tidak melakukan penambahan upaya penangkapan kepiting bakau di perairan Sebatik. One of the information needed for formulating the sustainable management of mud crab is the availability of information on the population parameters and its exploitation rate. The current research aimed to study the population parameters and the exploitation rate of mud crab in Sebatik Waters. Field research was conducted in March – December 2017. Samples of mud crab were obtained from the catch of fisherman by trap in Sebatik Waters. The Von Bertalanffy growth parameters were constructed through monthly modals progression analysis of the size of carapace width frequencies distributions and the exploitation rate was estimated through the method of length converted catch curve. The results showed that the carapace width of mud crabs caught by trap in Sebatik Waters ranged between 84 to 144 mmCW with the mean size of 107.05±12.3 mmCW for male and 110.2±8.86 mmCW for female. The growth of weights of male crab (b=3.6) is faster than its size, while the growth of weight of female crab was slower than its size (b=2,5). The sex ratio of mud crab was unbalanced (5.5 : 1) that the proportion of male was more dominant than female. Asymptotic carapace width (CW) of mud crab was 151.2 mmCW for male and 140.5 mmCW for female. The growth rate (K) of mud crab was 0.75 year-1 for male and 0.79 year-1 for female. The exploitation status of mud crab was starting to overfishing (E=0,5-0,55) so it suggest to not increase the fishing effort of mud crab fishery in Sebatik Waters.
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Moser, S. M., D. J. Macintosh, S. Pripanapong i 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, nr 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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Widaningroem, Retno, i Alim Isnansetyo. "KEMAMPUAN ADAPTASI KEPITING BAKAU (Scyla serrata) TERHADAP PERUBAHAN SALINITAS AIR". Jurnal Perikanan Universitas Gadjah Mada 1, nr 1 (26.01.1996): 22. http://dx.doi.org/10.22146/jfs.8843.
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Objectives of this research were to know water salinity change which can be use for culturing and fattening of mud crab, and to know adaptation of mud crab on water salinity change. The research used modified bioassay method and completely randomized factorial design consisted of two factor namely water salinity change (0,5 and 10 ppt of water salinity change) and duration of water salinity change (3 and 6 hours).The result indicated that decreasing salinity by 5 and 10 ppt per 3 and 6 hours from 20 to 0 ppt could be adapted by mud crab. As well as increasing if salinity by 5 and 10 ppt per 10 and 6 hours from 20 to 5 ppt could be adapted by mud crab. Mud crab was able to adapt water salinity change by 5 and 10 ppt per 3 and 6 hours from 0 to 50 ppt.
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Susanto, Adi, i Ririn Irnawati. "PENGGUNAAN BENTUK DAN POSISI CELAH PELOLOSAN PADA BUBU LIPAT KEPITING BAKAU (Shape and Position Escape Gap Application of Collapsible Mud Crab Trap)". Marine Fisheries : Journal of Marine Fisheries Technology and Management 4, nr 2 (27.09.2016): 109. http://dx.doi.org/10.29244/jmf.4.2.109-114.
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<p>ABSTRACT<br />The use of capture technology is not environmentally friendly and low public awareness to restore the Mud crab (Scylla sp.) that still poses a threat to small crab in natural resource conservation. The use of a gap for passage of the mud crab trap folding is one of the fishing technology innovations that will increase the size of crabs caught making it more environmentally friendly. This study aims to determine the size, shape and position of mounting an effective escape gap on collapsible traps for mud crabs that have not passed a decent catch. The method used was a laboratory experiment conducted on Fisheries Department UNTIRTA using escape gap is 2 boxes (50x50) mm and rectangular (60x36) mm mounted on the top and bottom position of the mouth traps. The results showed that the folding rectangular traps more effective mud crab that has not passed a decent escape capture by the percentage reaches 65%. Position mounting a more effective escape gap is at the bottom position of the mouth traps with crab escape frequency percentage of 54%.<br />Key words: collapsible trap, escape gap, fishing technology, mud crab</p><p>-------</p><p><br />ABSTRAK<br />Penggunaan teknologi penangkapan yang tidak ramah lingkungan dan rendahnya kesadaran masyarakat untuk mengembalikan kepiting bakau yang masih berukuran kecil memberikan ancaman terhadap kelestarian sumberdaya kepiting di alam. Penggunaan celah pelolosan pada bubu lipat kepiting bakau merupakan salah satu inovasi teknologi penangkapan yang akan meningkatkan ukuran kepiting yang tertangkap sehingga lebih ramah lingkungan. Penelitian ini bertujuan untuk menentukan ukuran, bentuk dan posisi pemasangan celah pelolosan yang efektif pada bubu lipat untuk meloloskan kepiting bakau yang belum layak tangkap. Metode penelitian yang digunakan adalah percobaan laboratorium yang dilakukan di Jurusan Perikanan UNTIRTA dengan menggunakan 2 celah pelolosan yaitu kotak (50x50) mm dan persegi panjang (60x36) mm yang dipasang pada posisi atas dan bawah mulut bubu. Hasil penelitian menunjukkan bahwa bubu lipat berbentuk persegi panjang lebih efektif meloloskan kepiting bakau yang belum layak tangkap dengan persentase pelolosan mencapai 65%. Posisi pemasangan celah pelolosan yang lebih efektif adalah pada posisi bawah mulut bubu dengan persentase pelolosan mencapai 54%.<br />Kata kunci: bubu lipat, celah pelolosan, teknologi penangkapan, kepiting bakau</p>
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Jirapunpipat, Kanchana, Masashi Yokota i Seiichi Watanabe. "The benefits of species-based management of sympatric mud crabs migrating to a common fishing ground". ICES Journal of Marine Science 66, nr 3 (19.01.2009): 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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Suwirya, Ketut, Nyoman Adiasmara Giri i Muhamad Marzuqi. "REPLACEMENT OF FISH MEAL PROTEIN BY SOY BEAN AND CORN GLUTEN MEAL PROTEINS IN THE DIET OF MUD CRAB, Scylla paramamosain". Indonesian Aquaculture Journal 4, nr 1 (30.06.2009): 75. http://dx.doi.org/10.15578/iaj.4.1.2009.75-78.
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Mud crab culture relies heavily on trash fish as the main source of feed ingredients. Artificial diets have been developed for mud crab and most of them have high content of fish meal. The increasing cost and demand of fish meal has encouraged feed manufacture to search for cheaper alternative protein sources such as plant protein. There is an urgent need to find suitable alternative protein sources to reduce the dependence of fish meal in mud crab diet. The objective of this study was to develop compounded feeds for juvenile of mud crab with reduced fish meal content, and as an alternative of trash fish feeding. For that reason, the experiment was done. Experimental diets were fish meal, 20% of soy bean (20% SBP), 40% of soy bean (40% SBP), 20% of corn gluten (20% CGP), and 40% of corn gluten meal protein (40% CGP). Average initial mud crab body weight of 0.65 ± 0.03 g was fed experimental diets for 56 days. The result showed that dietary fish meal protein can be replaced by 20% of soy bean and 20%–40% of corn gluten proteins for mud crab (Scylla paramamosain) diet. Thus, it can arguably be concluded that soy bean and corn gluten proteins are the alternative protein sources to partially replaced fish meal.
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Hidayat, Thomas, Helman Nur Yusuf, Nurulludin Nurulludin i Andina Ramadhani Putri Pane. "PARAMETER POPULASI KEPITING BAKAU (Scylla serrata) DI PERAIRAN PASAMAN BARAT". BAWAL Widya Riset Perikanan Tangkap 9, nr 3 (30.01.2018): 207. http://dx.doi.org/10.15578/bawal.9.3.2017.207-213.
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Pemanfaatan sumber daya kepiting bakau (Scylla serrata) di perairan Pasaman Barat sudah lama dilakukan oleh nelayan kecil dengan menggunakan bubu (tangkul) yang bersifat tidak selektif. Sebagai komoditi perikanan yang mempunyai nilai ekonomis penting di Indonesia, perlu dilakukan pengelolaan yang tepat agar ketersediaannya tetap berkelanjutan. Penelitian dilaksanakan bulan Januari - November 2016, dengan tujuan mengkaji beberapa parameter populasi sebagai bahan kebijakan pengelolaan kepiting bakau di perairan Pasaman Barat agar tetap lestari. Pengumpulan sampel dilakukan secara acak dari hasil tangkapan nelayan oleh enumerator. Metode analisis parameter populasi menggunakan distribusi frekwensi lebar karapas dengan bantuan program FiSAT (FAO-ICLARM Stock Assessement Tools)-II. Hasil analisis diperoleh laju pertumbuhan (K) sebesar 0,63 pertahun, (CW)= 178,5 mm, kematian alami (M) 1,06 pertahun, kematian karena penangkapan (F)= 1,03 per tahun, dan kematian total (Z)=2,09 pertahun. Tingkat eksploitasi (E) =0,49. Tingkat pemanfaatan kepiting bakau di perairan Pasaman Barat sudah pada tahapan yang jenuh (fully exploited). Pembatasan alat tangkap merupakan opsi yang paling memungkinkan.Mud crab (Scylla serrata) is one of fisheries commodity that has an important economic value in Indonesia. Utilization of mud crabs in West Pasaman had been exploited for years long time with traps fishing gear. The research was conducted in January - November 2016 in the waters of West Pasaman. Sampling were conducted randomly. This paper aims to determine some population parameters of mud crab to used as a guidance guidance in the management of mud crab. in the waters of West Pasaman. Population parameter data analysis using software FiSAT (FAO-ICLARM Stock assessement Tools) II. The results of population dynamic parameters of mud crab showed that growth rate (K) was 0.63 per year, Length infinity (L) was 178.5 mm, natural mortality (M) was 1.06 per year, fishing mortality (F) was 1.03 per year, and total mortality (Z) 2.09 per year. Exploitation rate (E) was 0.49. The exploitation rate of mud crabs in the waters of West Pasaman were (fully exploited), the fishing need to be managed carefully, limitation of fishing gear is the most likely option to be enforced.
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Hudita, Kemala, Agustono Agustono i Widya Paramita Lokapirnasari. "Addition of Crude Fish Oil (CFO) on Feed Toward Growth and Feed Conversion Ratio of Mud Crab (Scylla serrata)". Journal of Marine and Coastal Science 9, nr 1 (15.07.2020): 30. http://dx.doi.org/10.20473/jmcs.v9i1.20758.
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Mud crab is one of the fishery commodity which potential to be cultured because it has high economic value. Mud crab has nutrients content such as protein 62,72%, lipid 0,83%, ash 7,5% and water content 9,9%. Trash fish is fresh feed which commonly used as main feed for the growth of mud crab juvenile of 5,3to 13,8%, however Kuniran fish has omega-3 eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) content which is necessary for optimum growth of mud crab.The study method was implemented as the experimental method use Completely Randomized Design (CRD) which consists of five treatments and four replications. The quantity of Crude Fish Oil which is added in trash fish feed on this study are: Treatment A (0%), B (2%), C (4%), D (6%) dan E (8%). The observed parameters are growth of mud crab and feed conversion ratio value. Data analysis use Variant Analysis (ANAVA) and continued with Duncan's Multiple Range Test to determine differences between treatments. The results shows that addition of Crude Fish Oil in trash feed fish for 32 days of rearing gives significantly different effect (P<0,05) toward length and width of mud crab carapace, meanwhile toward feed conversion value of mud crab doesn’t gives significantly different effect (P>0,05). High length and width growth of carapace were obtained on D and E treatment. The water quality of mud crab during 32 days of rearing is the temperature range of 28-29°C, pH range of 7,5-9,0, salinity range of 15-21ppt, dissolve oxygen range of 4 mg/l and ammonium range of 0,09-0,27 mg/l.
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Kantun, Wayan, Warda Susaniati i 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, nr 1 (17.05.2022): 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.