Academic literature on the topic 'Fish larvae'
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Journal articles on the topic "Fish larvae"
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Hsieh, Hung-Yen, Ming-An Lee, Wei-Lun Chiu, and Pei-Jie Meng. "Comparison of Abundance and Structure of Larval Fish Assemblages between Autumn and Spring in the Waters Surrounding Taiwan Bank, Western North Pacific." Fishes 9, no. 1 (December 29, 2023): 16. http://dx.doi.org/10.3390/fishes9010016.
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The fluctuations in both time and space of larval fish assemblages in relation to hydrographic characteristics in the waters surrounding Taiwan Bank were studied in October 2021 (autumn) and March 2022 (spring). Throughout the study period, we identified a total of 149 taxa of fish larvae, encompassing 96 genera and 71 families. Engraulis japonicus, Diaphus slender type, unidentified Gobiidae, Apogon sp., unidentified Clupeidae, and Benthosema pterotum were the six dominant taxa and together constituted 47.39% of the total catch. There were no notable temporal variations observed in the abundance of fish larvae, but the species number of fish larvae was greater in spring than in autumn. Significant variations in species composition were observed between the different cruises, and the cluster analysis unveiled a distinct temporal structure of the assemblages of fish larvae. The dynamics of the prevailing currents induced by seasonal monsoons contribute significantly to the transportation of fish larvae. The distribution of fish larvae showed a good association with hydrographic characteristics, where seawater temperature and salinity emerged as the primary explanatory factors influencing the composition of larval fish assemblages in the waters surrounding Taiwan Bank. While the increased influx of nutrients from upwelling ensures abundant food availability, the hydrographic conditions may not be suitable for every fish larva.
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Puspasari, Reny, Ario Damar, M. Muklis Kamal, DTF Lumban Batu, Ngurah Nyoman Wiadnyana, and M. Taufik. "DINAMIKA LARVA IKAN SEBAGAI DASAR OPSI PENGELOLAAN SUMBER DAYA IKAN DI LAGUNA PULAU PARI KEPULAUAN SERIBU." Jurnal Kebijakan Perikanan Indonesia 5, no. 1 (May 31, 2013): 1. http://dx.doi.org/10.15578/jkpi.5.1.2013.1-7.
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Proses rekruitmen populasi ikan sangat ditentukan oleh kelangsungan hidup larva ikan yang ada di daerah pemijahan/asuhan. Laguna Pulau Pari merupakan daerah pemjahan bagi banyak jenis larva ikan karang. Tujuan dari penelitian ini adalah untuk mengkaji dinamika kelimpahan dan komposisi dari larva ikan di laguna Pulau Pari. Hasil penelitian menunjukkan bahwa kelimpahan larva ikan yang ditemukan berkisar antara 1,0 x103 – 14,7 x 103 individu/m3. Puncak kelimpahan tertinggi terjadi pada bulan Juli dan Oktober. Larva ikan ditemukan tersebar di semua lokasi pengamatan. Larva pada fase perkembangan pre flexion ditemukan dalam presentase yang paling tinggi. Selama masa pengamatan ditemukan 79 famili larva ikan yang didominasi oleh Pomacentridae, Aulostomidae, Blenniidae, Engraulidae dan Pinguipedidae. Dinamika yang terjadi pada larva ikan dapat dijadikan dasar bagi pengelolaan perikanan di wilayah Laguna Pulau Pari dengan cara memperluas daerah perlindungan laut dan rehabilitasi ekosistem Laguna Pulau Pari, sehingga peran dan fungsinya sebagai pemasok rekrut bagi stok ikan di perairan sekitarnya terjaga. Fish Recruitment is, in turn, thought to be directly related to the survival of the early life stages in the spawning/nursery ground. Pulau Pari Laguna is considered as a spawning ground for many reef fishes. The aims of the research were to investigate the dynamic of abundance and composition of fish larvae in Pulau Pari lagune. The Results show, fish larvae abundance range between 1,0 x 103 – 14,7 x 103 ind/m3. Highest larval abundance occurred on July and October, which predicted as the month of fish larvae production seasons. Fish larvae were distributed in all part of the lagune. Larvae in the pre flexion stage found in the highest precentation compare to other. Totally 79 families of reef fish larvae were found during June – November 2010 dominated by Pomacentridae, Aulostomidae, Blenniidae, Engraulidae and Pinguipedidae.
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Amri, Khairul, Atiah Al Mutoharoh, and Dwi Ernaningsih. "SEBARAN LARVA IKAN DAN KAITANNYA DENGAN KONDISI OSEANOGRAFI LAUT SULAWESI." Jurnal Penelitian Perikanan Indonesia 21, no. 2 (June 15, 2015): 103. http://dx.doi.org/10.15578/jppi.21.2.2015.103-114.
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<p>Laut Sulawesi diketahui sebagai daerah penangkapan ikan yang potensial sekaligus diduga sebagai lokasi pemijahan. Berbagai jenis larva ikan pelagis maupun demersal ditemukan di perairan ini. Kelimpahan dan sebaran larva ikan di suatu perairan sangat dipengaruhi oleh kondisi oseanografi seperti temperatur, salinitas dan sejumlah parameter lainnya termasuk ketersediaan pakan. Untuk mengetahui pengaruh parameter oseanografi terhadap kelimpahan dan sebaran spasial larva ikan di Laut Sulawesi, telah dilakukan penelitian menggunakan kapal riset KR Baruna Jaya VII pada Oktober 2012. Parameter oseanografi yaitu temperatur dan salinitas diukur menggunakan iCTD dan sampling larva menggunakan bonggo net pada 18 stasiun pengukuran. Analisa hubungan kondisi oseanografi dengan sebaran larva dilakukan secara deskriptif dan pemetaan sebarannya dilakukan secara spasial. Hasil menunjukan keterkaitan sejumlah parameter oseanografi dengan kelimpahan dan sebaran spasial larva ikan. Sebaran larva famili Scombroidae dominan berada pada perairan bersalinitas tinggi karena merupakan jenis ikan oseanik. Larva ikan demersal banyak ditemukan di perairan sekitar Kep.Sangihe Talaud. Kelimpahan larva tertinggi ditemukan di perairan bagian utara dan barat lokasi penelitian dimana kelimpahan plankton tinggi ditemukan.</p><p> </p><p>Celebes Sea is known as a potential fishing and spawning grounds for several pelagic fish species. Abundance and distribution of fish larvae are allegedly linked to oceanographic conditions such as temperature, salinity and others oceanographic parameters including food availablity. To see the effect of oceanographic on the abundance and spatial distribution of fish larvae in the Celebes Sea, has conducted a research in October 2012using the research vessel KR Baruna Jaya VII. The measurement of oceanographic parameters including temperature and salinity and larval sampling were done respectively by using iCTD and Bonggo net at 18 measuring stations. The analysis of data was carried out for dertemining the effect of oceanographic condition to the fish larvae distribution and distribution mapping spatially of larvae abundance. Results show that there were a connection between fish larvae abundance and spatial distribution with oceanographic parameters. Scombridae larvae distribution was dominant at waters with high salinity condition because they are oceanic. Demersal fish larvae are mostly found in waters around Sangihe-Talaud islands. Highest abundance of fish larvae was found at northern and western part of research locations where the higher plankton concentration was found.</p>
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Rinaldi, Rexa Kurnia, Niniek Widyorini, and Pujiono Wahyu Purnomo. "KOMPOSISI LARVA IKAN DI KAWASAN KOSERVASI MANGROVE DUSUN SENIK, DESA BEDONO, KECAMATAN SAYUNG, DEMAK." Management of Aquatic Resources Journal (MAQUARES) 6, no. 2 (March 9, 2018): 147–55. http://dx.doi.org/10.14710/marj.v6i2.19823.
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ABSTRAK Stadia larva merupakan fase pertumbuhan awal ikan. Distribusi dan Kelimpahan larva ikan di Ekosistem Mangrove merupakan proses rekruitmen alami. Kawasan Konservasi Mangrove Dusun Senik Desa Bedono merupakan daerah asuhan dan daerah mencari makan bagi larva ikan, saat ini daerah tersebut terkena abrasi. Hilangnya sebagian besar daratan memberikan pengaruh terhadap distribusi dan kelimpahan larva ikan. Penelitian ini bertujuan untuk mengetahui jenis, kelimpahan, dan sebaran larva ikan di kawasan konservasi mangrove Desa Bedono. Penelitian dilakukan di Kawasan Konservasi Mangrove Desa Bedono bulan September - Oktober 2016. Metode penelitian yang digunakan adalah survei dengan penentuan titik sampling secara purposive. Hasil yang diperoleh jumlah larva ikan yang tertangkap sebanyak 20.320 individu/150m3 yang terdiri dari 12 famili yaitu: Mugilidae (1.120 ind/150m3), Chanidae (20 ind/150m3), Gerreidae (60 ind/150m3), Apogonidae (17.360 ind/150m3), Scatophagidae (40 ind/150m3), Gobiidae (180 ind/150m3), Belonidae (40 ind/150m3), Ambassidae (20 ind/150m3), Lutjanidae (620 ind/150m3), Engraulidae (60 ind/150m3), Nemipteridae (40 ind/150m3), dan Oryziatidae (760 ind/150m3). Nilai kelimpahan larva ikan pada titik I sebesar 393 ind/150m3, titik II sebesar 607 ind/150m3, titik III sebesar 800 ind/150m3, titik IV sebesar 1.687 ind/150m3, titik V sebesar 1.633 ind/150m3, titik VI sebesar 607 ind/150m3, titik VII sebesar 235 ind/150m3, titik VIII sebesar 793 ind/150m3. Berdasarkan indeks morisita, pola sebaran larva ikan adalah acak. Kesimpulan yang dapat diambil adalah famili Apogonidae mendominasi dengan persentase 85,43%, nilai kelimpahan tertinggi terdapat pada titik IV, dan pola distribusi larva ikan menyebar secara acak yaitu keberadaan spesies tidak memiliki kecenderungan untuk hidup berkoloni dan dapat bertahan hidup di mana saja pada suatu ekosistem. Kata Kunci : Larva ikan; Komposisi; Kelimpahan; Pola Distribusi; Kawasan Konservasi Mangrove ABSTRACT Larval stage is the early growth phase of fish. Distribution and abundance of larval fish in mangrove ecosystem is a natural recruitment process. Mangrove Conservation Area at Senik hamlet Bedono village is the breeding and feeding areas for fish larvae, now the area is damaged by abrasion. The loss of the most mainland affects to the distribution and abundance of fish larvae. This study aims to determine the type, abundance and distribution of fish larvae in mangrove conservation area at Bedono village. The study was conducted in Bedono village Mangrove Conservation Area in September-October 2016. The research method that is used is a survey with purposive sampling point determination. The results obtained, the number of fish larvae caught are 20.320 individuals/150m3 consisting of 12 families, namely: Mugilidae (1.120 ind/150m3), Chanidae (20 ind/150m3), Gerreidae (60 ind/150m3), Apogonidae (17.360 ind/150m3), Scatophagidae (40 ind/150m3), Gobiidae (180 ind/150m3), Belonidae (40 ind/150m3), Ambassidae (20 ind/150m3), Lutjanidae (620 ind/150m3), Engraulidae (60 ind/150m3), Nemipteridae (40 ind/150m3), and Oryziatidae (760 ind/150m3). The value abundance of fish larvae in point I is 393 ind/150m3, in point II is 607 ind/150m3, in point III is 800 ind/150m3, point IV is 1.687 ind/150m3, point V is 1.633 ind/150m3, point VI is 607 ind/150m3, point VII is 235 ind/150m3, point VIII is 793 ind/150m3. Based on morisita index, the distribution pattern of fish larvae is random. The conclusion of this research are family Apogonidae dominates by percentage 85.43%, the highest abundance values is contained in point IV, and the distribution pattern of fish larvae randomly spread, means that the species does not live in colonies and can survive anywhere in an ecosystem. Keywords : Fish Larvae; Composition; Abundance; Distribution; Mangrove Conservation Area
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Wadjo, Amirudin, Frederika S. Pello, and Dicky Sahetapy. "POTENSI LARVA IKAN DI PERAIRAN TELUK KOTANIA, KABUPATEN SERAM BAGIAN BARAT." TRITON: Jurnal Manajemen Sumberdaya Perairan 19, no. 2 (October 30, 2023): 165–74. http://dx.doi.org/10.30598/tritonvol19issue2page165-174.
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The presence of fish larvae is one of the main factors for the sustainability of fish resources. Information on the potential of fish larvae is very useful for the conservation of fish resources. This study aims to analyze species composition (richness), individual abundance, the relationship of fish larvae abundance with physical-chemical parameters and formulate strategies and priorities for fish larvae management. The research was conducted in August and October at 8 stations. Potential data were analyzed using diversity index, uniformity index, dominance, and abundance of fish larvae. PCA analysis was used to assess the relationship between water quality parameters and fish larvae abundance. SWOT and AHP analysis were used to formulate management strategies and priorities. Based on the results, 9 genus/species of fish larvae belonging to 9 families, 5 orders of Class Osteichtyes were obtained. The abundance of fish larvae was highest in October. Serranus sp. and Siganus sp. larvae had high individual abundance. The parameters salinity, water temperature, current speed, PO4, SiO3, pH, water brightness, and DO have a correlation (+), meaning that these water quality parameters had a directly proportional relationship with fish larvae abundance. Eight strategies were formulated, with two primary priorities for the potential development of fish larvae in Kotania Bay waters, three secondary priorities and three tertiary priorities.
ABSTRAK
Keberadaan larva ikan merupakan salah satu faktor utama kelestarian sumberdaya ikan. Informasi tentang potensi larva ikan sangat berguna bagi kelestarian sumberdaya ikan. Penelitian ini bertujuan untuk menganalisis komposisi (kekayaan) spesies, kelimpahan individu, hubungan kelimpahan larva ikan dengan parameter fisik-kimia dan merumuskan strategi serta prioritas pengelolaan larva ikan. Penelitian dilakukan pada Agustus dan Oktober di 8 stasiun. Analisa data potensi menggunakan indeks keanekaragaman, indeks keseragaman, dominansi, dan kelimpahan larva ikan. Analisis PCA digunakan untuk mengkaji hubungan parameter kualitas air dengan kelimpahan larva ikan. Analisis SWOT dan AHP digunakan untuk merumuskan strategi dan prioritas pengelolaan. Berdasarkan hasil penelitian diperoleh 9 genus/spesies larva ikan yang termasuk dalam 9 famili, 5 Ordo dari Class Osteichtyes. Kelimpahan larva ikan tertinggi pada bulan Oktober. Larva ikan Serranus sp. dan Siganus sp. memiliki kelimpahan individu tinggi. Parameter salinitas, suhu air, kecepatan arus, PO4, SiO3, pH, kecerahan air, dan DO memiliki korelasi (+), yang berarti parameter kualitas perairan itu memiliki hubungan berbanding lurus dengan kelimpahan larva ikan. Dirumuskan delapan strategi, dengan dua prioritas primer pengembangan potensi larva ikan di perairan Teluk Kotania, tiga prioritas sekunder dan tiga prioritas tersier.
Kata Kunci: komposisi, kelimpahan, larva ikan, pengelolaan, Teluk Kotania
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Claus-Walker, Debra B., Philip H. Crowley, and Frank Johansson. "Fish predation, cannibalism, and larval development in the dragonfly Epitheca cynosura." Canadian Journal of Zoology 75, no. 5 (May 1, 1997): 687–96. http://dx.doi.org/10.1139/z97-089.
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We manipulated the risk of fish predation and cannibalism in semi-field and laboratory experiments with larvae of the dragonfly Epitheca cynosura. Results of a 22-week semi-field experiment showed that larvae from different densities were indistinguishable in mean size by the end of the experiment, but that individuals from low densities were larger until week 12. Larvae from low densities varied less in size than did those from high densities. Larvae showed rapid convergence of densities in the absence of fish. Fish predation also generated rapid convergence of densities. The presence of fish initially reduced larval size variation. There was a significant trend for the presence of fish scent to increase larval survival at low larval densities over survival in the absence of fish. Behavioral observations in the laboratory supported the results of the semi-field study in that (i) dragonfly larvae reduced their activity under daytime conditions, (ii) the presence of large larvae caused small larvae to increase their hiding inside a refuge and inhibited their crawling while exposed, (iii) small larvae ate fewer prey in the presence of fish. The results of our study suggest that the interaction between intra- and inter-specific predation risk may prove to be important for survival and development of animals in natural systems.
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Saraswati, Saraswati, Agus Hartoko, and Sasanti Retno Suharti. "HUBUNGAN KERAPATAN LAMUN DENGAN KELIMPAHAN LARVA IKAN DI PULAU PRAMUKA, KEPULAUAN SERIBU JAKARTA." Management of Aquatic Resources Journal (MAQUARES) 5, no. 3 (December 20, 2016): 111–18. http://dx.doi.org/10.14710/marj.v5i3.14397.
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ABSTRAKStadia larva merupakan fase awal daur kehidupan bagi ikan. Larva adalah biota perairan yang bersifat planktonik dan termasuk kedalam jenis meroplankton. Ekosistem Padang Lamun di Pulau Pramuka memiliki fungsi ekologis yang cukup penting di wilayah pesisir, dimana ekosistem ini merupakan salah satu daerah asuhan dan daerah mencari makan bagi larva ikan. Adanya perbedaan tingkat kerapatan lamun dan keberadaan makanan dapat memberikan pengaruh terhadap kelimpahan larva ikan. Sehingga hal tersebut menjadi landasan dilakukannya penelitian mengenai Hubungan Kerapatan Lamun Terhadap Kelimpahan Larva Ikan di Pulau Pramuka, Kepulauan Seribu Jakarta. Penelitian ini bertujuan untuk mengetahui kelimpahan larva ikan pada kerapatan lamun yang berbeda dan mengetahui pengaruh kerapatan lamun terhadap kelimpahan larva ikan. Metode yang digunakan adalah metode survei dengan penentuan titik sampling menggunakan metode purposive sampling. Hasil yang diperoleh adalah pada stasiun I tingkat kerapatan lamun padat (34156 individu/100m2) nilai kelimpahan larva ikan sebesar 756 individu/200m2 terdiri dari 8 famili. Stasiun II kerapatan sedang (26410 individu/100m2) nilai kelimpahan larva ikan yaitu 579 individu/200m2 terdiri dari 6 famili, dan stasiun III ketapatan jarang (6321 individu/100m2) nilai kelimpahan larva ikan sebesar 426 individu/200m2 yang terdiri dari 4 famili. Nilai korelasi antara kelimpahan larva ikan dengan kerapatan lamun yaitu sebesar r = 0,772. Berdasarkan hal tersebut dapat disimpulkan bahwa terdapat hubungan yang erat antara kelimpahan dan komposisi famili larva ikan dengan kerapatan lamun. Semakin tinggi nilai kerapatan lamun maka semakin tinggi pula nilai kelimpahan dan komposisi famili larva ikan. Begitu pula semakin rendah nilai kerapatan lamun maka nilai kelimpahan dan komposisi larva ikan juga semakin rendah. Kata Kunci : Kerapatan Lamun; Larva Ikan; Kelimpahan; Pulau Pramuka ABSTRACTLarval stage is the early phase of the life cycle for the fish. The larvae are aquatic biota that are planktonic and included into the type meroplankton. Seagrass ecosystems in Pramuka Island, has important ecological functions in coastal areas, where the ecosystem is one of the nursery ground and feeding ground for fish larvae. The big difference the density of seagrass and the presence of food can influence abundance of fish larvae. Thus, it will be the base for doing this research on The relations between Seagrass Density and Fish Larvae Abundance in Pramuka, Seribu Island Jakarta. This research aims to determine the abundance of fish larvae in different seagrass densities and determine the influence of the seagrass density on the abundance of fish larvae. The method used is survey method in determining the point of sampling using purposive sampling method. The results obtained are at station I the densities in dense seagrass (34156 individuals/100m2) abundance of fish larvae value at 756 individuals/200m2 consisting of eight families. Station II medium density (26410 individuals/100m2) the value of the abundance of fish larvae is 579 individuals/200m2 consisting of 6 families, and station III precision rarely (6321 individuals/100m2) the value of fish larvae abundance at 426 individuals/200m2 consisting of 4 families. The correlation values between the abundance of fish larvae with the density of seagrass in the amount of r = 0,772. Based on the above, we can conclude that there is a close relationship between the abundance and composition of fish larvae families with seagrass density. The higher the density of seagrass, the higher the families abundance and composition of fish larvae. Similarly, the lower the density value then the value of seagrass abundance and composition of fish larvae are also lower. Keywords: Sea Grass Density; Fish Larvae; Abundance; Pramuka Island.
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Lacerda, A. C. F., M. Santin, R. M. Takemoto, G. C. Pavanelli, A. Bialetzki, and F. C. Tavernari. "Helminths parasitizing larval fish from Pantanal, Brazil." Journal of Helminthology 83, no. 1 (March 2009): 51–55. http://dx.doi.org/10.1017/s0022149x08092171.
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AbstractFish larvae of ‘corvinas’ (Pachyurus bonariensis and Plagioscion ternetzi) from Sinhá Mariana Lagoon, Mato Grosso State, were collected from March 2000 to March 2004, in order to determine the parasitic fauna of fishes. Larvae from the two species were parasitized by the same endoparasites: Contracaecum sp. Type 2 (larvae) (Nematoda: Anisakidae) in the mesentery and Neoechinorhynchus (Neoechinorhynchus) paraguayensis (Acanthocephala: Neoechinorhynchidae) in the stomach and the terminal portion of the intestine. Statistical analysis showed that there was a significant positive correlation between the standard length of hosts and the abundance of acanthocephalans and nematodes, and that the prevalence of nematodes presented a significant positive correlation with the standard length of the two species of hosts, indicating the presence of a cumulative process of infection. The present study constitutes the first record of nematodes and acanthocephalans parasitizing larval fish, as well as the first record of endoparasites in fish larvae in Brazil. In addition, it lists a new locality and two species of hosts for Contracaecum sp. Type 2 (larva) and N. (N.) paraguayensis.
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Daryumi, Daryumi, Sahala Hutabarat, and Abdul Ghofar. "KOMPOSISI DAN DISTRIBUSI SPASIAL LARVA IKAN EKONOMIS PENTING DI PERAIRAN ESTUARI BANJIR KANAL TIMUR KOTA SEMARANG." Management of Aquatic Resources Journal (MAQUARES) 5, no. 3 (December 20, 2016): 91–97. http://dx.doi.org/10.14710/marj.v5i3.14394.
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ABSTRAK Perairan estuari Banjir Kanal Timur berfungsi sebagai daerah asuhan bagi larva ikan. Daerah estuari bersifat fluktuatif sehingga sifat-sifat fisik, kimia dan biologi bervariasi, pada fase larva ikan sangat menentukan kelangsungan hidup dari spesies ikan maupun populasi. Oleh karena itu, mengetahui keberadaan larva ikan ekonomis penting dapat memberi informasi tentang daerah mana yang dapat digunakan sebagai daerah penangkapan dan daerah mana yang harus dilestarikan. Penelitian dilakukan pada bulan Maret-April 2016 di Muara Banjir Kanal Timur Kota Semarang yang bertujuan untuk mengetahui komposisi dan distribusi spasial larva ikan. Metode yang digunakan yaitu metode Purposive Random Sampling. Hasil penelitian menunjukan jumlah rata-rata larva ikan sebanyak 1851 ind/150m3 terdiri dari famili Apogonidae, Mugilidae, Gerreidae, Lutjanidae, Engraulidae, Nemipteridae, Ambassidae, Gobiidae dan Chanidae. Jenis larva ikan yang yang paling banyak ditemukan adalah Mugillidae (Belanak) 38,92%, sedangkan yang paling sedikit adalah Chanidae (Bandeng) 0,38%. Larva ikan paling banyak tertangkap di daerah pantai (Titik III) dan yang paling sedikit tertangkap didaerah muara menuju sungai (Titik VI). Perhitungan indeks morista menunjukan larva ikan menyebar secara acak. Struktur komunitas larva ikan yaitu indeks keanekaragaman (H’) berkisar 0,64-1,66, indeks keseragaman (E) berkisar 0,14-0,39, dan indeks dominasi berkisar 0,21-0,67. Berdasarkan hasil uji regresi menunjukkan antara salinitas dengan kelimpahan larva ikan berkorelasi positif, sedangkan kecepatan arus dengan kelimpahan larva ikan berkorelasi negatif. Kata Kunci: Estuari; Larva Ikan; Komposisi; Distribusi; Banjir Kanal Timur Semarang. ABSTRACT The estuaries of eastern Banjir Kanal served as the nursery ground for fish larvae. Areas of estuaries were fluctuating. So the parameters of the physical, chemical and biological were variation, in fish larvae phas largely determine survival rate of fish species or populations. For it to, knowing the existence of economically important fish larvae could providing information about which areas be using as a capture area and which areas that should be preserved. Research conducted in March-April 2016 at the Eastern Banjir Kanal of Semarang, aims to find out the composition and spatial distribution of fish larvae. The method used Purposive Random Sampling method. The research showed the range number of larvae as 1851 ind/150m3 consists of Familia Apogonidae, Mugilidae, Gerreidae, Lutjanidae, Engraulidae, Gobiidae, Ambassidae, Nemipteridae and Chanidae. Types of fish larvae found the most high was Mugillidae (Mullet) 38,92%, while the least was Chanidae (Milkfish) 0,38%. The larvae of most fish caught in coastal areas (point III) and the least caught in the estuary towards the river (Point VI). The calculation of the index morista fish larvae spread randomly. Fish larvae community structures were the index of diversity (H ') range from 0,64-1,66, uniformity index (E) range 0,14-0,39, and dominance index range from 0,21-0,67. Based on the results of the regression analysis showed between salinity with an abundance of fish larvae correlating positively, where the current speed with an abundance of fish larvae correlating negatively.Keywords: Estuarie; Fish Larvae; Composition; Distribution; Eastern Banjir Kanal Semarang.
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Stoll, Stefan, and Peter Beeck. "Larval fish in troubled waters — is the behavioural response of larval fish to hydrodynamic impacts active or passive?" Canadian Journal of Fisheries and Aquatic Sciences 69, no. 10 (October 2012): 1576–84. http://dx.doi.org/10.1139/f2012-086.
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In a mesocosm experiment, we tested whether larval fish show an active behavioural response to hydrodynamic impacts. Exposing 1- to 3-week-old allis shad ( Alosa alosa ) larvae to a pulsed wave regime, we found that already 1-week-old larvae immediately adapt their microhabitat use and activity patterns at the onset of the wave pulses. The fish larvae instantaneously increased their activity level and moved downwards, concentrating in the calmer lower third of the water column. Within 4 min after the end of the wave pulse, the fish returned to their former distribution. Two- and 3-week-old fish larvae foraged close to the bottom substratum during calm periods but avoided this zone during the wave pulses. Thus, larval fish show an active response to hydrodynamic impacts. With the ability to adjust microhabitat use and activity level, already fish larvae are able to trade costs and benefits associated with spatio-temporal hydrodynamic heterogeneity. In particular, fish larvae should be able to minimize some of the harmful effects of navigation-induced waves where calmer evasion habitats are available.
Dissertations / Theses on the topic "Fish larvae"
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Le, Vay Lewis. "Nutritional studies on fish and crustacean larvae." Thesis, Bangor University, 1994. https://research.bangor.ac.uk/portal/en/theses/nutritional-studies-on-fish-and-crustacean-larvae(7c8004f1-ea27-4a8e-9d38-30c32f9ace4f).html.
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The effects of live foods and microencapsulated diets on growth, survival, body composition and digestive physiology of fish (mirror carp, Cyprinus =LQ) and penaeid shrimp ftna= japQnim) larvae were examined. Raising the lipid content of a microencapsulated enrichment diet from 18.3% to 33.6% improved accumulation of highly unsaturated fatty acids (HUFA) and total lipid in rotifers. Lipids in rotifers were assimilated by carp larvae, as demonstrated by improved growth and accumulation of HUFA in larvae reared on rotifers pre-fed the "high-lipid" diet. Poor diet digestibility coupled with low ingestion rates and low digestive enzyme activity in larvae were identified as contributing to the failure of a microencapsulated diet to support good growth and survival when fed directly to first-feeding carp. Preliminary testing indicates that digestibility of microencapsulated diets for fish larvae can be improved by inclusion of pancreatin. Experiments with Penaeus japonicus indicate that dietary requirements for protein, energy and HUFA by penaeid larvae are lower than previously thought. Foods of low protein content (Chaetoceros gladlia) or low digestibility (microencapsulated diet) elicited high trypsin activity in mysis larvae, compared to those fed Artemia. Larvae receiving both C , gmcilis and Artemi exhibited an intermediate level of trypsin activity - which may explain the superior growth and protein retention in postlarvae reared on the mixed regime. A microencapsulated diet did not support growth and carbon and nitrogen retention equivalent to that in larvae fed live food, despite the strong trypsin response, in mysis larvae. When used together with a low density of _C, p-racilis the microencapsulated diet produced postlarvae of the same size and tissue composition as those reared using live food. It is suggested that the algal co-feed may enhance growth through stimulation of trypsin secretion, supply of extra digestible nutrients or provision of unidentified specific growth enhancing factor(s).
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Fjellheim, Anders Jon. "Selection and administration of probiotic bacteria to marine fish larvae." Doctoral thesis, Norwegian University of Science and Technology, Department of Biology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-2217.
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Uji, Susumu. "Muscle development and muscular abnormalities in the teleost fish larvae." Kyoto University, 2014. http://hdl.handle.net/2433/192130.
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Catalán, Alemany Ignacio. "Condition Indices and their Relationship with Environmental Factors in Fish Larvae." Doctoral thesis, Universitat de Barcelona, 2003. http://hdl.handle.net/10803/1422.
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The high variability in the recruitment of marine fishes is probably explained by small fluctuations in the mortality rates of early developmental stages. A popular proxy for the potential mortality of fish larvae is the study of nutritional condition (or simply "condition"). According to the growth-mortality hypothesis, a lowered condition has a high associated probability of total mortality.This thesis offers new information on several aspects of nutritional condition and growth indices, by working on two main lines:
1) Laboratory Studies: Three main types of condition indices were investigated in larvae of a well-known laboratory-reared species (sea bass Dicentrarchus labrax). Acknowledging for the species-specificity of condition indices, this experimental Chapter was devoted to the study of various properties of morphometric, histological and biochemical indices, in response to several feeding schemes. Also, effort was placed in the improvement of some of the indices and the study of their relationship with survival in the laboratory.
In the last Section of this Chapter (comparative analysis), a model to relate potential survival with the different indices is proposed.
2) Field Studies: the relationships between environmental variables, nutritional status and growth of Sardina pilchardus (Walbaum 1972) larvae in an area of the Catalan Sea (NW Mediterranean) were studied. Pilchard is the most abundant commercial pelagic fish species in the NW Med. Despite its economic importance and the known decline of the stock since 1993, the studies on possible links between environmental conditions and pilchard early life history are hardly developed in this area.
The field studies were based on three oceanographic cruises conducted in November 1998, February 1999 and November 1999. Firstly, biotic and abiotic environmental variables were related to larval distribution, abundance and size-structure. Secondly, the nutritional condition and growth was studied in two of the cruises. Environmental variables considered at each station included potential food, fluorescence, temperature, salinity and the maximum Brünt-Väisälä frequency. Long-term growth was analysed through otolith analyses and muscle fibre growth patterns. Condition was studied through hystological an biochemical (protein ad RNA/DNA ratios) indices. The possible effect of environmental variables on potential survival is discussed.
The main conclusions of the thesis were:
LABORATORY STUDIES
1)Morphometric indices proved useful in distinguishing the shape of larvae subjected to differing feeding conditions. This was done through multivariate analysis on variables from which the effect of size had been completely removed, whilst incorporating the information on allometry.
2)The quantitative determination of muscle fibre separation (MFS) showed to be the best histological method (within those tested) to detect a suboptimal nutritional state.
3)The RNA/DNA ratio is more appropriate in detecting a nutritional deficiency in post-flexion than in pre-flexion larvae.
4)Within the biochemical indices studied in post-flexion larvae subjected to a short-term food deprivation and re-feeding, the RNA/DNA and the LDH/DNA ratios are considered particularly useful.
5)In post-flexion larvae subjected to 2 days of fast, the cell proliferation rate measured in the muscle was significantly lower than in Fed larvae. This was not observed in the brain, which is more conservative to the food withdrawal.
6)The comparison of morphometric, histological and biochemical indices shows that, in pre-flexion larvae, the quantitative determination of muscle fibre separation is the index that soonest detects the effect of food deprivation. For the same age-range, the RNA/DNA yields the maximum correct discrimination percentage (100%). In this study, the MFS was the condition index that held the best correspondence with larval mortality.
7)The larval susceptibility to mortality at sea may be more related to those deficiencies that involve organs or tissues that are of crucial importance for feeding behaviour, escape response or maintenance of floatability, like the muscle. It is here proposed an scheme of how indices could be weighted in order to relate them with survival potential.
FIELD STUDIES
8)In November 1998, certain environmental characteristics were found to be positively associated with nutritional condition of S.pilchardus, measured through histological and RNA/DNA indices. These areas can be characterised by an optimum "environmental window" defined by temperature values under 19ºC, values of the Brunt-Väissälä (B-V) water stability index under 0.8 cycles h-1 and values of potential food abundance over 4.5 nauplii l-1 and 5.5 individuals l-1 of the rest of the microzooplankton. The variables that best related to larval condition were the B-V index and the amount of potential food. Moreover, the larval abundance was higher in those areas. Therefore, it is considered that larval survival would be enhanced in these areas.
9)In February 1999 the eggs and larval abundance was lower than in November 1998.
10)The long-term growth studied through otolith analyses suggests that larval growth was enhanced in November 1998 with respect to February 1999. This result was confirmed by the analysis of the muscle fibre growth patterns. Condition was also better in November 1998, although the February data were less clear.
11)The measures of growth and condition showed a general coincident pattern. The analysis of muscle growth patterns suggests that in pilchard larvae growth is hypertrophic until 6-7 mm SL, becoming hyperplastic at least until 13.5 mm SL. Within the histological measures studied, the MFS was the most informative. The RNA/DNA appeared more useful in larvae over 8-10 mm SL.
12)The amount of larvae in the November 1998 and February 1999 cruises was anomalously low for the time of the year. Hydrographic conditions during both cruises were highly unusual, exhibiting high stratification in November and an inverted salinity pattern in February. The presence of a mesoscale anticyclonic eddy of new AW, that remained in the area from October 1998 to February 1999, is thought to account for the unusual hydrographic conditions and the low numbers of eggs and larvae in some areas.
13)Overall, the data on larval abundance, nutritional condition and environmental characteristics suggest that the spawning season autumn 1998-winter 1999 was characterised by a low larval production of this species. It is concluded, from the joint interpretation of all data, that putative larval survival would be the result of a reduced spawning and nutritional condition in some areas and periods, and a reduced growth in the winter cruise.
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Nanton, Dominic André. "Nutritional value of marine harpacticoid copepods as live food for marine fish larvae." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq24887.pdf.
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Theron, Dirk Leopold. "The biological control of malaria mosquito larvae using smaller indigenous freshwater fish species." Thesis, University of Limpopo, 1987. http://hdl.handle.net/10386/2611.
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Minkoff, Gideon. "The effect of secondarily enriched rotifers on growth and survival of marine fish larvae." Thesis, University of Stirling, 1988. http://hdl.handle.net/1893/2536.
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Nutritional aspects of three species of marine fish larvae, herring Clupea harengus L., plaice Pleuronectes platessa L. and turbot, Scophthalmus maximus L. were examined. Larvae were fed three different diets all of which were derived from rotifers Brachionus plicatilis (O.F. Mtlller). These rotifers had been mass cultivated on baker's yeast and then enriched with baker's yeast, or with one of two unicellular algae, Isochrysis galbana Park or Nannochloropsis (Nannochloris) oculata (Droop) Hibberd. The biochemical changes that these enrichments conferred on the rotifer were examined. There was little difference in proximate and amino acid compositions. Dry weights, and calorific contents of the rotifers fluctuated according to the type, temperature and duration of enrichment, with the yeast enriched rotifers tending to weigh less (200-320 ng) than their algal counterparts (250-370ng). Major differences were found in the total fatty acid profiles of the rotifers. Yeast-enriched rotifers had no 18:3n-3 or 20:5n-3 and only trace amounts of 22:6n-3 fatty acids. The Nanrinochioropsis-enriched rotifers had substantial amounts of n-3 fatty acids though only of 20:5n-3 (11-14%), while rotifers enriched with Isochrysis had only trace amounts of 20:5n-3 (2-4%). All three species of fish responded similarly to the yeast enriched rotifer diet. Their growth, in terms of length and weight, was minimal and they never developed any fin ray elements. Both flatfishes developed a looped gut in the short growth duration on this diet and some turbot (20%) inflated their swim bladder. This retardation of growth was attributed to the lack of long chain highly unsaturated n-3 fatty acids (n-3 HUFA) in the diet. During one month feeding trials it was shown that herring and plaice were able to exploit both algal-enriched rotifer diets equally well. Turbot, on the other hand grew better, over 14 days, on rotifers enriched with lsochrysis compared with Nannochioropsis. The reaction of the different species was linked to the fatty acid profiles of the diet. Hence, turbot require a dietary input of 22:6n-3 while herring and plaice thrived equally well on diets containing only 20:n-3. Juvenile plaice consistently exhibited improved pigmentation when Isochrysis compared to Nannochloropsis were used as the rotifer enrichment. The effect was attributed to specific nutrients particular to algal chloroplasts, which need to be present in the diet of the larvae up to metamorphosis. Assessment of daily rations, employing the rotifer enriched with Isochrysis diet only, showed herring to reduce their food intake from 46 to 19% body dry weight/d between days 10-21 post hatch while turbot consumed between 34-169% body dry weight/d with no apparent age related effects. The gross growth efficiencies (Ki, Brett & Groves, 1979) for both species were seemingly unaffected by age related processes and fluctuated between 15-50% in turbot and 20-61% in herring according to fluctuations in daily food intake. Ingestion is further described for both species with a linear model that related food intake to larval weight. The weight-specific ingestion was found to be a constant 13% and 43% of body dry weight in herring and turbot respectively. The weight-specific ingestion and specific growth rate estimates were combined with other data available from the literature, revealing that larvae tend to consume food (in dry weight) at a level equivalent to approximately twice their daily dry weight increase.
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Pham, Cong Tri. "The ecology of fish larvae in Pumicestone Passage : an estuarine system in Southeast Queensland, Australia /." St. Lucia, Qld, 2000. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16437.pdf.
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Omar, Othman Abdu Hashim. "Abundance and distribution of Ichthyoplankton in the Firth of Forth, Scotland." Thesis, Heriot-Watt University, 1988. http://hdl.handle.net/10399/963.
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Huebert, Klaus B. "Behavior and Transport of Pelagic Coral Reef Fish Larvae in the Straits of Florida." Scholarly Repository, 2009. http://scholarlyrepository.miami.edu/oa_dissertations/266.
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The supply of coral reef fish larvae from the open ocean to reefs is vital for the persistence of local fish populations. Whether larvae are dispersed over hundreds of km or only few km depends on biophysical interactions between larvae and their environment. Relationships between environmental variables, larval swimming behavior, and larval transport were examined for reef fish larvae in the Florida Straits. In a series of research cruises, the upper 100 m of the water column was sampled with plankton nets fishing at four different depths. Variability in the vertical distributions of most larvae was not consistently related to measured environmental variables. Relative densities of larvae were predictably related to sampling depth in five taxa. In seven taxa, more developed larvae were distributed significantly deeper than less developed larvae, revealing ontogenic vertical migrations. In three taxa, vertical distributions varied significantly between day and night, revealing diel migrations. Since the Florida Current was strongest near the surface, observed vertical distributions and migrations resulted in reduced larval transport relative to surface currents. To identify cues involved in regulating vertical distributions, behavioral experiments were conducted with larvae from four reef fish families. All four groups showed significant responses to pressure cues, swimming up in response to high pressure and down in response to low pressure. In two families there was a significant correlation between capture depth and experimental pressure preference, suggesting that larvae use similar behavior to regulate depth in situ. To study horizontal swimming behavior, late-stage larvae of one species were caught in light-traps and observed by SCUBA divers ~1 km offshore of the Florida Keys barrier reef. All larvae swam remarkably straight, but their swimming directions were distributed randomly. A simulation model was used to generate swimming trajectories of longer duration than could be observed directly. Observed and simulated trajectories indicated that horizontal swimming by larvae with or without an external reference frame was important at spatial scales of several km. Overall, some larvae exercised a strong influence on transport, either by vertical or horizontal swimming. Behaviors varied between species and families, highlighting the need for more species-specific data.
Books on the topic "Fish larvae"
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Kohler, Carl. Marine fish eggs and larvae. Ottawa, Ont: Communications Directorate, Dept. of Fisheries and Oceans, 1985.
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Canada. Dept. of Fisheries and Oceans. Marine Fish Eggs and Larvae. S.l: s.n, 1985.
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N, Finn R., and Kapoor B. G, eds. Fish larval physiology. Enfield, NH: Science Publishers, 2008.
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N, Finn R., and Kapoor B. G, eds. Fish larval physiology. Enfield, NH: Science Publishers, 2008.
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Yúfera, Manuel, ed. Emerging Issues in Fish Larvae Research. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73244-2.
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Neira, Francisco J. Larvae of temperate Australian fishes: Laboratory guide for larval fish identification. Nedlands, W.A: University of Western Australia Press, 1998.
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Holt, J. Larval fish nutrition. Chichester, West Sussex, UK: Wiley-Blackwell, 2011.
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Larval Fish Conference (10th 1986 Miami, Fla.). 10th Annual Larval Fish Conference. Bethesda, Md: American Fisheries Society, 1987.
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I, Browman Howard, Skiftesvik Anne Berit, Havforskningsinstituttet (Norway), Universitetet i. Bergen, Norges forskningsråd, and Fifth Framework Programme (European Commission), eds. The big fish bang: Proceedings of the 26th annual Larval Fish Conference. Bergen, Norway: [Institute of Marine Research], 2003.
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Larval Fish Conference (13th 1989 Mérida, México). Larval fish recruitment and research in the Americas: Proceedings of the thirteenth annual Larval Fish Conference, Mérida, México, May 1989. Edited by Hoyt Robert D, Mote Marine Laboratory (Sarasota, Fla.), and Instituto Nacional de Pesca (Mexico). Seattle, WA: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, 1991.
Find full textBook chapters on the topic "Fish larvae"
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Sautereau, Camille A., Emma Gairin, Marc Besson, Vincent Laudet, David Lecchini, and Laurence Besseau. "Coral Reef Fish Larvae as Model Systems to Understand Marine Fish Larval Recruitment." In Marine Larvae, 55–87. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003359388-4.
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Primo, Ana Lígia. "Ecology of Marine Fish Larvae." In Encyclopedia of the UN Sustainable Development Goals, 323–32. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-319-98536-7_27.
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Primo, Ana Lígia. "Ecology of Marine Fish Larvae." In Encyclopedia of the UN Sustainable Development Goals, 1–10. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-319-71064-8_27-1.
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Ishikawa, Yuji, Naoyuki Yamamoto, and Hanako Hagio. "Nervous System in Medaka Larvae." In Brain Development of Medaka Fish, 169–200. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4324-9_12.
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Oozeki, Yoshioki. "Biological Monitoring: Fish Eggs, Fish Larvae, and Zooplankton." In Fish Population Dynamics, Monitoring, and Management, 111–38. Tokyo: Springer Japan, 2018. http://dx.doi.org/10.1007/978-4-431-56621-2_7.
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Fernández-Palacios, Hipólito, Birgitta Norberg, Marisol Izquierdo, and Kristin Hamre. "Effects of Broodstock Diet on Eggs and Larvae." In Larval Fish Nutrition, 151–81. Oxford, UK: Wiley-Blackwell, 2011. http://dx.doi.org/10.1002/9780470959862.ch5.
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Kamler, Ewa. "Feeding of fish larvae in aquaculture." In Early Life History of Fish, 211–15. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2324-2_7.
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Pyatkina, Galina A. "Olfactory Receptors in Acipenseridae Fish Larvae." In Chemical Signals in Vertebrates 6, 161–64. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4757-9655-1_26.
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Kime, David E. "Disruption in Eggs, Embryos, Larvae and Juvenile Fish." In Endocrine Disruption in Fish, 187–200. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-4943-7_8.
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Engrola, Sofia, Cláudia Aragão, Luisa M. P. Valente, and Luís E. C. Conceição. "Nutritional Modulation of Marine Fish Larvae Performance." In Emerging Issues in Fish Larvae Research, 209–28. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73244-2_7.
Full textConference papers on the topic "Fish larvae"
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Uzdensky, Anatoly B. "Helium-neon laser radiation effect on fish embryos and larvae." In OE/LASE '94, edited by R. Rox Anderson. SPIE, 1994. http://dx.doi.org/10.1117/12.184953.
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Supriatna, S., M. P. Tambunan, and H. F. Azzahra. "Estuary area and fish larvae cathing location in Cimadur, Bayah, Banten, Indonesia." In PROCEEDINGS OF THE 3RD INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES 2017 (ISCPMS2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5064182.
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Zhang, Ji-Min. "Primary survey and investigation on fish eggs and larvae in Lai Zhou Bay." In 2016 International Conference on Advanced Materials and Energy Sustainability (AMES2016). WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813220393_0082.
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Babkin, A. M., I. B. Babkina, N. E. Khodkevich, A. A. Atrokhova, and A. V. Simakova. "MUSCULAR TREMATODOSIS OF LEUCISCUS IDUS IN THE BASIN OF THE MIDDLE OB." In V International Scientific Conference CONCEPTUAL AND APPLIED ASPECTS OF INVERTEBRATE SCIENTIFIC RESEARCH AND BIOLOGICAL EDUCATION. Tomsk State University Press, 2020. http://dx.doi.org/10.17223/978-5-94621-931-0-2020-63.
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Ide plays a dominant role in commercial catches in the Middle Ob basin (Tomsk Oblast, Russia). The most numerous muscular trematodes of the ide are Opisthorchis felineus, which is pathogenic for humans, and Paracoenogonimus ovatus, a parasite of fish-eating birds. The highest rates of infection of the ide by the larvae of the feline fluke (the extensiveness of invasion is 100%, the intensity of invasion is 52.6 ind. per fish). The rates of P. ovatus metacercariae infection are two times lower. The intensity of invasion increases with the size and age of the fish. Thus, ide is of key importance in maintaining the focus of opisthorchiasis in the basin of the Middle Ob.
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Faqihuddin, M., S. Supriatna, and T. G. Pin. "The distribution of fish larvae based on salinity values at coastal Sukabumi, West Java, Indonesia." In PROCEEDINGS OF THE 3RD INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES 2017 (ISCPMS2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5064184.
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Li, Gen, Hao Liu, Ulrike K. Mu¨ller, and Johan L. van Leeuwen. "Swimming Hydrodynamics and Maneuverability in C-Start of Zebrafish Larvae: An Integrated Computational Study." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-19020.
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Fishes often exhibit stable body undulating in body and caudal fin (BCF) mode during cyclic swimming, but can perform remarkable maneuverability with significantly different swimming modes in case of C-start. Aiming at unveiling the mechanisms of swimming hydrodynamics and maneuverability of C-start, we have developed an integrated computational framework to model a free-swimming larval zebrafish (Danio rerio) by coupling the equations of 3DoF (Degrees of Freedom) motion and Navier-Stokes (NS) equations. Unsteady hydrodynamics is resolved by integrating models of realistic fin-body morphology and body-undulatory kinematics with an in-house NS solver. The instantaneous forces and moments on the body provided by the NS-solutions serve as input for 3DoF equations of motion. In this study, with a specific focus on a C- start as well as a subsequent transient phase till the cyclic swimming phase, we construct a larval zebrafish model, which can mimics realistic body motions and deformations based on measurements. Validation of the simulation is discussed by comparing model predictions with experimental measurements, which indicates that the present integrated model is capable to accurately predict free-swimming dynamics and hydrodynamics. The model successfully simulated a swimming bout of C-start and cyclic swimming: a wake topology of double row vortex ring structures is observed behind the fish; and a strong jet is visible at the center of the vortex ring, pushing water backward as the fish accelerates.
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P.S., Iliushina, and Brigida A.V. "THE USE OF DRUGS TO COMBAT SAPROLEGNIOSIS AND THEIR EFFECT ON THE RESULT OF HATCHING OF STURGEON LARVAE." In II INTERNATIONAL SCIENTIFIC AND PRACTICAL CONFERENCE "DEVELOPMENT AND MODERN PROBLEMS OF AQUACULTURE" ("AQUACULTURE 2022" CONFERENCE). DSTU-Print, 2022. http://dx.doi.org/10.23947/aquaculture.2022.56-57.
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Based on scientific research, the article presents the main morphometric indicators of sterlet grown in closed water supply installations under certain conditions: temperature, oxygen and pH modes. The article describes the behavior of these sturgeon fish in favorable and unfavorable conditions. The analysis of scientific articles on this topic was carried out and the results of the study were presented.
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Muzaki, Farid Kamal, Aninditha Giffari, and Dian Saptarini. "Community structure of fish larvae in mangroves with different root types in Labuhan coastal area, Sepulu – Madura." In PROCEEDING OF INTERNATIONAL BIOLOGY CONFERENCE 2016: Biodiversity and Biotechnology for Human Welfare. Author(s), 2017. http://dx.doi.org/10.1063/1.4985416.
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Yu.A., Novoselova, Arnautov M.V., and Gershunskaya V.V. "STUDY OF THE EFFECTIVENESS OF MANNANOLIGOSACCHARIDES IN COMPOUND FEEDS FOR STURGEON FINGERLING." In II INTERNATIONAL SCIENTIFIC AND PRACTICAL CONFERENCE "DEVELOPMENT AND MODERN PROBLEMS OF AQUACULTURE" ("AQUACULTURE 2022" CONFERENCE). DSTU-Print, 2022. http://dx.doi.org/10.23947/aquaculture.2022.96-99.
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The general characteristics of immunomodulators related to the class of oligosaccharides, which are perspective for use in the starter compound feeds for sturgeon are given. Because of fish-breeding and biological tests, it was revealed that the use of Agrimos in an amount of 1% in the composition of starter feed has a positive effect on the survival and growth perfomance of the bester larvae.
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Hii, Y. S., M. H. Mohd, Mohd Izzat Mohd Thiyahuddin, M. A. A. Rahman, and C. H. Tan. "Improving Biological Reefing Viability Index as a Predictive Tool for Assessment of Potential Reefing Site in the Tropical Shallow Offshore Environment." In SPE Symposium: Decommissioning and Abandonment. SPE, 2021. http://dx.doi.org/10.2118/208497-ms.
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Abstract The current study improved the predictive capability of the biological reefing viability index (BRVI) calibrated using local data. The prediction capability of the BRVI improved from 61% to 76% accuracy out of the 181 locations where the underwater videos available for verification. The BRVI includes corals larvae density, age of larvae at site, sea current, sea temperature, chlorophyll-a, water depth and sediment type to predict biological productivity of an area. Among the parameters, corals larvae density and age of the larvae are the most critical parameters that influent establishment of new biological ecosystem. The BRVI uses settlement of corals larvae as the precursors for the establishment of new habitats in the offshore environment because scleractinian corals is known to be able to form backbone of a new habitat in the environment. In this approach, the BRVI focuses on habitat creation instead of just being a fish aggregating device (FAD) when an artificial reef is deployed in an area. The BRVI can be used as a rapid screening tool to identified potential area for deployment of artificial reefs. The BRVI could reduce the chances of artificial reefs deployment that failed to address its objectives and intended outcomes.
Reports on the topic "Fish larvae"
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Koven, William, Gordon Grau, Benny Ron, and Tetsuya Hirano. Improving fry quality, survival and growth in commercially farmed fish by dietary stimulation of thyroid hormone production in premetamorphosing larvae. United States Department of Agriculture, 2004. http://dx.doi.org/10.32747/2004.7695856.bard.
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There is a direct correlation between successful metamorphosis from larvae to post-larvae and the quality of the resultant juveniles or fry. Juvenile quality, in turn, is a major factor influencing fish production level and market price. However, following the profound morphological and physiological changes occurring during metamorphosis, the emerging juveniles in some species characteristically demonstrate heterotrophic growth, poor pigmentation, cannibalism and generally poor survival. The white grouper (Epinephelus aeneus) in Israel and the Pacific threadfin (Polydactylussexfilis) in Hawaii are two promising candidates for mariculture that have high market value but a natural fishery that has sharply declined in recent years. Unfortunately, their potential for culture is severely hampered by variable metamorphic success limiting their production. The main objective was to compare the efficacy and economic viability of dietary or environmental iodine on metamorphic success and juvenile quality in the white grouper and the pink snapper which would lead to improved commercial rearing protocols and increased production of these species both in Israel and the US. The Hawaii Institute of Marine Biology encountered problems with the availability of pink snapper brood stock and larvae and changed to Pacific threadfin or moi which is rapidly becoming a premier aquaculture species in Hawaii and throughout the Indo-Pacific. The white grouper brood stock at the National Center for Mariculture was lost as a result of a viral outbreak following the sudden breakdown of the ozone purification system. In addition, the NCM suffered a devastating fire in the fall of 2007 that completely destroyed the hatchery and laboratory facilities although the BARD project samples were saved. Nevertheless, by studying alternate species a number of valuable findings and conclusions that can contribute to improved metamorphosis in commercially valuable marine species resulted from this collaborative effort. The Israeli group found that exposing white grouper larvae to external TH levels synchronized and increased the rate of metamorphosis. This suggested that sub-optimal synthesis of TH may be a major factor causing size heterogeneity in the larval population and high mortality through cannibalism by their larger more metamorphosed cohorts. Two protocols were developed to enrich the larvae with higher levels of the TH precursor, iodine; feeding iodine enriched Artemia or increasing the level of seawater iodine the larvae are exposed to. Results of accumulated iodine in gilthead seabream larvae indicated that the absorption of iodine from the water is markedly more efficient than feeding iodine enriched Artemia nauplii. Samples for TH, which will be analyzed shortly, will be able to determine if another dietary factor is lacking to effectively utilize surplus tissue iodine for TH synthesis. Moreover, these samples will also clarify which approach to enriching larvae with iodine, through the live food or exposure to iodine enriched seawater is the most efficient and cost effective. The American group found that moi larvae reared in ocean water, which possessed substantially higher iodine levels than those found in seawater well water, grew significantly larger, and showed increased survival compared with well water reared larvae. Larvae reared in ocean water also progressed more rapidly through developmental stages than those in low-iodine well seawater. In collaboration with Israeli counterparts, a highly specific and precise radioimmunoassay procedure for thyroid hormones and cortisol was developed. Taken altogether, the combined Hawaiian and Israeli collaborative research suggests that for teleost species of commercial value, adequate levels of environmental iodine are more determinate in metamorphosis than iodine levels in the live zooplankton food provided to the larvae. Insuring sufficiently high enough iodine in the ambient seawater offers a much more economical solution to improved metamorphosis than enriching the live food with costly liposomes incorporating iodine rich oils.
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Wilkens, Justin, and Burton Suedel. Using the Fish Larvae and Egg Exposure System (FLEES) to generate effects data for informing environmental windows. Environmental Laboratory (U.S.), March 2017. http://dx.doi.org/10.21079/11681/21640.
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Gothilf, Yoav, Roger Cone, Berta Levavi-Sivan, and Sheenan Harpaz. Genetic manipulations of MC4R for increased growth and feed efficiency in fish. United States Department of Agriculture, January 2016. http://dx.doi.org/10.32747/2016.7600043.bard.
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The hypothalamic melanocortin system plays a central role in the regulation of food consumption and energy homeostasis in mammals. Accordingly, our working hypothesis in this project was that genetic editing of the mc4r gene, encoding Melanocortin Receptor 4 (MC4R), will enhance food consumption, feed efficiency and growth in fish. To test this hypothesis and to assess the utility of mc4r editing for the enhancement of feed efficiency and growth in fish, the following objectives were set: Test the effect of the mc4r-null allele on feeding behavior, growth, metabolism and survival in zebrafish. Generate mc4r-null alleles in tilapia and examine the consequences for growth and survival, feed efficiency and body composition. Generate and examine the effect of naturally-occurring mc4r alleles found in swordfish on feeding behavior, growth and survival in zebrafish. Define the MC4R-mediated and MC4R-independent effects of AgRP by crossing mc4r- null strains with fish lacking AgRP neurons or the agrpgene. Our results in zebrafish did not support our hypothesis. While knockout of the agrpgene or genetic ablation of hypothalamic AgRP neurons led to reduced food intake in zebrafish larvae, knockout (KO) of the mc4r gene not only did not increase the rate of food intake but even reduced it. Since Melanocortin Receptor 3 (MC3R) has also been proposed to be involved in hypothalamic control of food intake, we also tested the effectofmc3r gene KO. Again, contrary to our hypothesis, the rate of food intake decreased. The next step was to generate a double mutant lucking both functional MC3R and MC4R. Again, the double KO exhibited reduced food intake. Thus, the only manipulation within the melanocortin system that affected food intake in consistent with the expected role of the system was seen in zebrafish larvae upon agrpKO. Interestingly, despite the apparent reduced food intake in the larval stage, these fish grow to be of the same size as wildtype fish at the adult stage. Altogether, it seems that there is a compensatory mechanism that overrides the effect of genetic manipulations of the melanocortin system in zebrafish. Under Aim 3, we introduced the Xna1, XnB1l, and XnB2A mutations from the Xiphophorus MC4R alleles into the zebrafish MC4R gene. We hypothesized that these MC4R mutations would act as dominant negative alleles to increase growth by suppressing endogenous MC4R activity. When we examined the activity of the three mutant alleles, we were unable to document any inhibition of a co-transfected wild type MC4R allele, hence we did not introduce these alleles into zebrafish. Since teleost fish possess two agrpgenes we also tested the effect of KO of the agrp2 gene and ablation of the AgRP2 cells. We found that the AgRP2 system does not affect food consumption but may rather be involved in modulating the stress response. To try to apply genetic editing in farmed fish species we turned to tilapia. Injection of exogenous AgRP in adult tilapia induced significant changes in the expression of pituitary hormones. Genetic editing in tilapia is far more complicated than in zebrafish. Nevertheless, we managed to generate one mutant fish carrying a mutation in mc4r. That individual died before reaching sexual maturity. Thus, our attempt to generate an mc4r-mutant tilapia line was almost successful and indicate out non-obvious capability to generate mutant tilapia.
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Axenrot, Thomas, and Erik Degerman. Ontogenetic variation in lacustrine European smelt (Osmerus eperlanus) populations as a response to ecosystem characteristics : an indicator of population sensitivity to environmental and climate stressors. Department of Aquatic Resources, Swedish University of Agricultural Sciences, 2024. http://dx.doi.org/10.54612/a.5qdiolcgj2.
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Smelts play a key role in the pelagic ecosystem of large lakes in northern Europe and North America. In numbers, they often dominate the open water. In large lakes in Scandinavia (including Finland), European smelt (Osmerus eperlanus L.), a cold-water glacial relict, is commonly the most important prey for piscivorous fish species, but also acts by ontogenetic shifts as a predator on zoo-plankton, small crustaceans, fish larvae, mysids and occasionally – with increasing size - fish. Furthermore, the large numbers of smelt in the open water are important competitors to other planktivorous fish. Due to the diverse life histories and biological interactions of smelt in large lakes, its role in the food-web structure is expected to be variable. Smelt population dynamics, recruitment, size and age structure, growth, life history and mortality were analysed and compared for five Swedish lakes that varied in size, depth, morphology, trophic status and latitude to understand the varying life histories and roles in lake food-webs. The results showed that in shallow, eutrophic lakes smelt stayed small and short-lived, and populations experienced high mortality. In deeper, colder and less nutrient-rich lakes, smelts grew larger and older, and might shift to a piscivorous trophic level. By ontogenetic adaptions smelt seems to uphold high abundance and recruitment over a wide range of ecosystems, but in shallow lakes without cold water refuges smelt populations run the risk of collapsing on the occasion of extremely warm summers with drastic consequences for their predators and lake ecosystems.
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Funk, Steffen, and Felix Mittermayer. Biological oceanography and fishery science practical at Sea in the framework of the SeaRanger educational programme, Cruise No. AL607, February 10th – February 16th 2024, Kiel (Germany) – Kiel (Germany), SeaRanger. GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany, 2024. http://dx.doi.org/10.3289/cr_al607.
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This cruise was conducted as part of the educational training of fishers in the framework of the transdisciplinary SeaRanger program which is scientifically accompanied by the Institute of marine ecosystem and fisheries Science (IMF) at the University of Hamburg (UHAM), the Christian-Albrechts University Kiel, Centre for Ocean and Society (CeOS), the Thuenen-Institute for Baltic Sea fisheries (TI-OF), and the German Centre for Integrative Biodiversity Research (iDiv) in the framework of the joint project SpaCeParti (Coastal Fishery, Biodiversity, Spatial Use and Climate Change: A Participative Approach to navigate the Western Baltic Sea into a Sustainable Future; Grant no. 03F0914) funded by the BMBF. In order to give the fishermen as realistic an application of the standard monitoring techniques as possible, the trip was planned in such a way that the training part was integrated into a scientific monitoring programme focussing on the spawning activity of fish in the Belt Sea. By sampling a standardised station grid contributing to the joint long-term sampling efforts in the Western Baltic Sea which are internationally coordinated by the WBCF (Western Baltic cod Forum), the fishers learned how plankton, fish and water samples are taken, preserved, and analysed and gained a comprehensive insight into the hydrography and fauna of the western Baltic. Similar to the previous cruise AL606 in January 2024 conducted by the IMF no cod larvae and generally less larvae compared to previous years were observed in the Bongo 500 μm net samples from the Plankton grid stations, potentially indicating a delayed spawning activity of fish in the Belt Sea potentially related to the comparably low water temperatures in winter 2023/24. (Alkor-Berichte ; AL607)
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Funk, Steffen, and Christian Möllmann. Monitoring winter spawning activity of Western Baltic cod (Gadus morhua) (2021-25), Cruise No. AL606, January 22nd – January 30th 2024, Kiel (Germany) – Kiel (Germany), Winter cod 2021-25. GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany, 2023. http://dx.doi.org/10.3289/cr_al606.
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This cruise was the fourth out of five proposed cruises in the framework of the winter cod 2021- 25 cruises of the IMF, which aim to investigate the early winter spawning activity of Western Baltic cod. For this purpose, ichthyoplankton samples and cod samples were taken on a pre-defined station grid. Cod samples were used to investigate maturity stages and condition of adult cod. Plankton samples were analysed with a focus on the occurrence of cod eggs and larvae. The data will be used to identify whether there is a shift towards earlier spawning activities of Western Baltic cod and how spawning activity differs spatially between parts of the Belt Sea. During the cruise AL606 spawning cod were found in the Kiel Bight, the Mecklenburg Bight, and the Fehmarn Belt. First analyses of BONGO-net samples revealed no occurrence of cod larvae in the sampling area during this year’s January cruise 2024. This absence of cod larvae might be a result of the relatively harsh and cold winter of 2023/24 and an associated delay in the maturation and spawning of western Baltic cod compared to the warmer previous years 2021-2023. The observation of fewer larvae of other fish species (e.g., plaice) compared to previous years supports this hypothesis. However, especially the observation of spawning and post-spawning cod in the Mecklenburg Bight during AL606 provided further evidence for the hypothesised temporal shift in spawning phenology towards an earlier onset than described in the past. (Alkor-Berichte ; AL606)
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Funkenstein, Bruria, and Cunming Duan. GH-IGF Axis in Sparus aurata: Possible Applications to Genetic Selection. United States Department of Agriculture, November 2000. http://dx.doi.org/10.32747/2000.7580665.bard.
Full textAbstract:
Many factors affect growth rate in fish: environmental, nutritional, genetics and endogenous (physiological) factors. Endogenous control of growth is very complex and many hormone systems are involved. Nevertheless, it is well accepted that growth hormone (GH) plays a major role in stimulating somatic growth. Although it is now clear that most, if not all, components of the GH-IGF axis exist in fish, we are still far from understanding how fish grow. In our project we used as the experimental system a marine fish, the gilthead sea bream (Sparus aurata), which inhabits lagoons along the Mediterranean and Atlantic coasts of Europe, and represents one of the most important fish species used in the mariculture industry in the Mediterranean region, including Israel. Production of Sparus is rapidly growing, however, in order for this production to stay competitive, the farming of this fish species has to intensify and become more efficient. One drawback, still, in Sparus extensive culture is that it grows relatively slow. In addition, it is now clear that growth and reproduction are physiological interrelated processes that affect each other. In particular sexual maturation (puberty) is known to be closely related to growth rate in fish as it is in mammals, indicating interactions between the somatotropic and gonadotropic axes. The goal of our project was to try to identify the rate-limiting components(s) in Sparus aurata GH-IGF system which might explain its slow growth by studying the ontogeny of growth-related genes: GH, GH receptor, IGF-I, IGF-II, IGF receptor, IGF-binding proteins (IGFBPs) and Pit-1 during early stages of development of Sparus aurata larvae from slow and fast growing lines. Our project was a continuation of a previous BARD project and could be divided into five major parts: i) obtaining additional tools to those obtained in the previous project that are necessary to carry out the developmental study; ii) the developmental expression of growth-related genes and their cellular localization; iii) tissue-specific expression and effect of GH on expression of growth-related genes; iv) possible relationship between GH gene structure, growth rate and genetic selection; v) the possible role of the IGF system in gonadal development. The major findings of our research can be summarized as follows: 1) The cDNAs (complete or partial) coding for Sparus IGFBP-2, GH receptor and Pit-1 were cloned. Sequence comparison reveals that the primary structure of IGFBP-2 protein is 43-49% identical to that of zebrafish and other vertebrates. Intensive efforts resulted in cloning a fragment of 138 nucleotides, coding for 46 amino acids in the proximal end of the intracellular domain of GH receptor. This is the first fish GH receptor cDNA that had been cloned to date. The cloned fragment will enable us to complete the GH - receptor cloning. 2) IGF-I, IGF-II, IGFBP-2, and IGF receptor transcripts were detected by RT-PCR method throughout development in unfertilized eggs, embryos, and larvae suggesting that these mRNAs are products of both the maternal and the embryonic genomes. Preliminary RT-PCR analysis suggest that GH receptor transcript is present in post-hatching larvae already on day 1. 3) IGF-1R transcripts were detected in all tissues tested by RT-PCR with highest levels in gill cartilage, skin, kidney, heart, pyloric caeca, and brain. Northern blot analysis detected IGF receptor only in gonads, brain and gill cartilage but not in muscle; GH increased slightly brain and gill cartilage IGF-1R mRNA levels. 4) IGFBP-2 transcript were detected only in liver and gonads, when analyzed by Northern blots; RT-PCR analysis revealed expression in all tissues studied, with the highest levels found in liver, skin, gonad and pyloric caeca. 5) Expression of IGF-I, IGF-II, IGF-1R and IGFBP-2 was analyzed during gonadal development. High levels of IGF-I and IGFBP-2 expression were found in bisexual young gonads, which decreased during gonadal development. Regardless of maturational stage, IGF-II levels were higher than those of IGF-L 6) The GH gene was cloned and its structure was characterized. It contains minisatellites of tandem repeats in the first and third introns that result in high level of genetic polymorphism. 7) Analysis of the presence of IGF-I and two types of IGF receptor by immunohistochemistry revealed tissue- and stage-specific expression during larval development. Immunohistochemistry also showed that IGF-I and its receptors are present in both testicular and ovarian cells. Although at this stage we are not able to pinpoint which is the rate-limiting step causing the slow growth of Sparus aurata, our project (together with the previous BARD) yielded a great number of experimental tools both DNA probes and antibodies that will enable further studies on the factors regulating growth in Sparus aurata. Our expression studies and cellular localization shed new light on the tissue and developmental expression of growth-related genes in fish.
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Klinger, Richard. Bachelor-MARSYS education cruise in the Baltic Sea Cruise No. AL577, 28.07. – 08.08.2022, Kiel (Germany) – Kiel (Germany) BALTEACH - 1. Institute for Marine Ecosystem and Fishery Science, Kiel, Germany, 2022. http://dx.doi.org/10.3289/cr_al577.
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During this teaching cruise, bachelor students of the Institute of Marine Ecosystem and Fishery Science (IMF) were supposed to get the opportunity to learn about the most commonly used scientific methods, gears and working procedures on board of a research vessel for fisheries science as well as biological oceanography. In order to achieve a great number of students participating a teaching cruise, this one has been split in half. Thus a change of 7 students has been realizable in Rønne, on the Danish island Bornholm. The scientific objective of the cruise was the investigation of distribution patterns of certain spawning fish species, such as cod, whiting, sprat, plaice, flounder and dab in the Kiel, Arkona and with special focus within the Bornholm Basin. In addition to fisheries, a comprehensive grid of plankton net stations was sampled in order to gain insights into the spatial distribution of fish eggs, planktivorous prey (larval to adult life stages) cod larvae and plankton distribution (most important for sprat) within the Bornholm Basin. Of special interest were picoplankton communities´ short term responses (on board) to temperature along the respective gradient in the Baltic Sea with an additional sampling scheme to later isolate Ostreococcus sp. and its associated viruses for future laboratory studies at the Institute for Marine Ecosystem and Fishery Science. (Alkor-Berichte ; AL577)
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Funkenstein, Bruria, and Shaojun (Jim) Du. Interactions Between the GH-IGF axis and Myostatin in Regulating Muscle Growth in Sparus aurata. United States Department of Agriculture, March 2009. http://dx.doi.org/10.32747/2009.7696530.bard.
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Growth rate of cultured fish from hatching to commercial size is a major factor in the success of aquaculture. The normal stimulus for muscle growth in growing fish is not well understood and understanding the regulation of muscle growth in fish is of particular importance for aquaculture. Fish meat constitutes mostly of skeletal muscles and provides high value proteins in most people's diet. Unlike mammals, fish continue to grow throughout their lives, although the size fish attain, as adults, is species specific. Evidence indicates that muscle growth is regulated positively and negatively by a variety of growth and transcription factors that control both muscle cell proliferation and differentiation. In particular, growth hormone (GH), fibroblast growth factors (FGFs), insulin-like growth factors (IGFs) and transforming growth factor-13 (TGF-13) play critical roles in myogenesis during animal growth. An important advance in our understanding of muscle growth was provided by the recent discovery of the crucial functions of myostatin (MSTN) in controlling muscle growth. MSTN is a member of the TGF-13 superfamily and functions as a negative regulator of skeletal muscle growth in mammals. Studies in mammals also provided evidence for possible interactions between GH, IGFs, MSTN and the musclespecific transcription factor My oD with regards to muscle development and growth. The goal of our project was to try to clarify the role of MSTNs in Sparus aurata muscle growth and in particular determine the possible interaction between the GH-IGFaxis and MSTN in regulating muscle growth in fish. The steps to achieve this goal included: i) Determining possible relationship between changes in the expression of growth-related genes, MSTN and MyoD in muscle from slow and fast growing sea bream progeny of full-sib families and that of growth rate; ii) Testing the possible effect of over-expressing GH, IGF-I and IGF-Il on the expression of MSTN and MyoD in skeletal muscle both in vivo and in vitro; iii) Studying the regulation of the two S. aurata MSTN promoters and investigating the possible role of MyoD in this regulation. The major findings of our research can be summarized as follows: 1) Two MSTN promoters (saMSTN-1 and saMSTN-2) were isolated and characterized from S. aurata and were found to direct reporter gene activity in A204 cells. Studies were initiated to decipher the regulation of fish MSTN expression in vitro using the cloned promoters; 2) The gene coding for saMSTN-2 was cloned. Both the promoter and the first intron were found to be polymorphic. The first intron zygosity appears to be associated with growth rate; 3) Full length cDNA coding for S. aurata growth differentiation factor-l I (GDF-II), a closely related growth factor to MSTN, was cloned from S. aurata brain, and the mature peptide (C-terminal) was found to be highly conserved throughout evolution. GDF-II transcript was detected by RT -PCR analysis throughout development in S. aurata embryos and larvae, suggesting that this mRNA is the product of the embryonic genome. Transcripts for GDF-Il were detected by RT-PCR in brain, eye and spleen with highest level found in brain; 4) A novel member of the TGF-Bsuperfamily was partially cloned from S. aurata. It is highly homologous to an unidentified protein (TGF-B-like) from Tetraodon nigroviridisand is expressed in various tissues, including muscle; 5) Recombinant S. aurata GH was produced in bacteria, refolded and purified and was used in in vitro and in vivo experiments. Generally, the results of gene expression in response to GH administration in vivo depended on the nutritional state (starvation or feeding) and the time at which the fish were sacrificed after GH administration. In vitro, recombinantsaGH activated signal transduction in two fish cell lines: RTHI49 and SAFI; 6) A fibroblastic-like cell line from S. aurata (SAF-I) was characterized for its gene expression and was found to be a suitable experimental system for studies on GH-IGF and MSTN interactions; 7) The gene of the muscle-specific transcription factor Myogenin was cloned from S. aurata, its expression and promoter activity were characterized; 8) Three genes important to myofibrillogenesis were cloned from zebrafish: SmyDl, Hsp90al and skNAC. Our data suggests the existence of an interaction between the GH-IGFaxis and MSTN. This project yielded a great number of experimental tools, both DNA constructs and in vitro systems that will enable further studies on the regulation of MSTN expression and on the interactions between members of the GHIGFaxis and MSTN in regulating muscle growth in S. aurata.
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Saillant, Eric, Jason Lemus, and James Franks. Culture of Lobotes surinamensis (Tripletail). Mississippi Department of Marine Resources, January 2014. http://dx.doi.org/10.18785/ose.001.
Full textAbstract:
The Tripletail, Lobotes surinamensis, is a pelagic fish found in tropical and sub-tropical waters of all oceans. Tripletails are often associated with floating debris and make frequent incursions in bays and estuaries where they are targeted by recreational fishermen. In Mississippi waters the species is typically present during the late spring and summer season that also correspond to the period of sexual maturation and spawning (Brown-Peterson and Franks 2001). Tripletail is appreciated as a gamefish but is also prized for its flesh of superior quality. The fast growth rate of juveniles in captivity documented by Franks et al. (2001) and the excellent quality of Tripletail flesh both contribute to the potential of this species for marine aquaculture. In addition, the production of cultured juveniles would be precious to develop a better understanding of the biology, early life history and habitat use of Tripletail larvae and juveniles, a topic largely undocumented to date, through experimental releases and controlled studies. The culture of tripletail thus supports the Tidelands Trust Fund Program through improved conservation of natural resources, potential enhancement of fisheries productivity and potential development of a new economic activity on the Gulf coast producing tripletail via aquaculture. The Objective of this project was to initiate development of methods and techniques needed to spawn captive held tripletail broodfish and raise their offspring to evaluate their growth and development in captivity. In this report we will present the results of studies aiming to develop methods and protocols for captive spawning of tripletail and the first data obtained on the early development of tripletail larvae. A major issue that was encountered with tripletail broodstock development during the project lied in the difficulties associated with identifying the sex of adults caught in the wild and candidates for being incorporated in mating sets for spawning. This issue was addressed during the course of the project by examining the potential of a non-lethal method of hormonal sexing. The results of these preliminary investigations are presented in the third part of this report. All protocols used in the project were determined with the guidance of the Institutional Animal Care and Use Committee (IACUC) of the University of Southern Mississippi (USM IACUC protocol number 10100108).