Asian Fisheries Science最新文献_第8页

Diversity of Biological Communities Along the Major Rivers of Sundarbans in Bangladesh 孟加拉国孙德尔本斯主要河流沿岸生物群落的多样性

Asian Fisheries Science Pub Date : 2021-06-30 DOI: 10.33997/j.afs.2021.34.2.002

Md. Nagim Uddin, Israt Jahan Tumpa, Z. Hossain

{"title":"Diversity of Biological Communities Along the Major Rivers of Sundarbans in Bangladesh","authors":"Md. Nagim Uddin, Israt Jahan Tumpa, Z. Hossain","doi":"10.33997/j.afs.2021.34.2.002","DOIUrl":"https://doi.org/10.33997/j.afs.2021.34.2.002","url":null,"abstract":"Despite recent unexpected and irreversible changes in the environment brought on by global climate change, the largest mangrove forest of Sundarbans is still considered a biodiversity hotspot in Bangladesh. This study aimed to assess the abundance, diversity indices and richness of plankton and fisheries resources of the four major rivers (Pasur, Sela, Sibsa, and Kapotakkho) in Sundarbans. During the study period (July 2017 to November 2018), the range of pH, temperature, salinity and dissolved oxygen values were from 7.1 to 8.7, 25 °C to 32.8 °C, 1.5 ‰ to 23 ‰ and 4.3 mg.L-1 to 7.7 mg.L-1 , respectively. Phytoplankton and zooplankton communities were represented by 29 and 18 species, respectively. The number of plankton per litre was highest in the Pasur River during both pre-monsoon and post-monsoon season. A total of 186 species of fish and crustaceans were recorded in the rivers of Sundarbans. The plankton, fish and crustacean diversity indices were as follows: Shannon-Wiener diversity (1.22 ± 0.27 to 3.48 ± 0.22), Margalef’s richness (1.29 ± 0.33 to 4.56 ± 0.45) and Pielou’s evenness (0.94 ± 0.04 to 1.02 ± 0.04). The results of the present study underscore new insight on riverine biological communities of the Sundarbans and emphasise the need for long-term monitoring in this ecologically fragile ecosystem.","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44844402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Community-Based Cobia, Rachycentron canadum (Linnaeus, 1766) Culture in Open Sea Cages at Olaikuda, Pamban Island, India: An Economic Analysis of Technology Transfer Initiative 基于社区的Cobia, Rachycentron canadum (Linnaeus, 1766)。印度Pamban岛Olaikuda敞海网箱养殖:技术转移倡议的经济分析

Asian Fisheries Science Pub Date : 2021-06-30 DOI: 10.33997/j.afs.2021.34.2.003

G. Rajaprabhu, R. Kirubagaran, C. Sureshkumar, J. Santhanakumar, M. K. Rasheeda, R. Sendhil Kumar, G. Dharani

{"title":"Community-Based Cobia, Rachycentron canadum (Linnaeus, 1766) Culture in Open Sea Cages at Olaikuda, Pamban Island, India: An Economic Analysis of Technology Transfer Initiative","authors":"G. Rajaprabhu, R. Kirubagaran, C. Sureshkumar, J. Santhanakumar, M. K. Rasheeda, R. Sendhil Kumar, G. Dharani","doi":"10.33997/j.afs.2021.34.2.003","DOIUrl":"https://doi.org/10.33997/j.afs.2021.34.2.003","url":null,"abstract":"The Olaikuda Village of Pamban Island was chosen to demonstrate and transfer the open sea cage culture technology of cobia by the National Institute of Ocean Technology (NIOT). Olaikuda is a fishing hamlet with 1,000 traditional fishers who are primarily involved in trap fishing. An attempt was made to supplement their income under the societal development initiative of the NIOT. With the active participation of the local fishers of Olaikuda, 3,000 hatcheryproduced cobia, Rachycentron canadum (Linnaeus, 1766) fingerlings were stocked equally in two cages with a stocking density of 4.7 fingerlings.m-3 . The cobia stocked in sea cages were reared with the locally available low-value fishes for 8 months. The sea farmed cobia attained an average weight of 3.3 kg resulting in an average daily growth rate of 13.5 g with a survival rate of 75 %. The fish were harvested on the 245th day of culture, which yielded 7,000 kg of marketable size cobia fish (1st cage 3,687 kg and 2nd cage 3,313 kg with an FCR of 1:5.5). The harvested fish were sold at the farm gate price of USD4.42 kg-1 , fetched USD30911.84. The economic analysis revealed a profit margin of USD1.26 kg-1 . The parameters such as cost of production, productivity, profitability, socio-economic impacts of native fishers were analysed during the study. The result of this farmer-driven attempt is encouraging the farmers across the coastal states to do cage culture farming in a big way. Similar efforts in more organised massive programs will create new jobs and reduce the fishing pressure on the natural sea stocks and considered a viable alternative livelihood for the fishers’ community affected by the declining natural fishery resources and international border issues.","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43997032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bacterial Community Changes in Penaeus vannamei Boone, 1931 Surface and Rearing Water During Enterocytozoon hepatopenaei Infection 凡纳滨对虾(Penaeus vannamei Boone, 1931)地表和养殖水体感染乙肝肠细胞虫期间细菌群落的变化

Asian Fisheries Science Pub Date : 2021-06-30 DOI: 10.33997/j.afs.2021.34.2.006

P. Baliga, Puneeth Thadooru Goolappa, M. Shekar, S. K. Girisha, K. S. Ramesh, Vilasini Udyavara, M. N. Venugopal

{"title":"Bacterial Community Changes in Penaeus vannamei Boone, 1931 Surface and Rearing Water During Enterocytozoon hepatopenaei Infection","authors":"P. Baliga, Puneeth Thadooru Goolappa, M. Shekar, S. K. Girisha, K. S. Ramesh, Vilasini Udyavara, M. N. Venugopal","doi":"10.33997/j.afs.2021.34.2.006","DOIUrl":"https://doi.org/10.33997/j.afs.2021.34.2.006","url":null,"abstract":"White faeces syndrome is one of the major disease problems in shrimp aquaculture, resulting in enormous economic losses to farmers. Although white faeces syndrome is usually associated with Enterocytozoon hepatopenaei (EHP) infections, it may not be the sole cause for the occurrence of white faecal strings on the pond water surface. There is limited information on the microbial dynamics in a pond affected by white faeces syndrome. Hence, this study aimed at the bacterial community changes occurring on the surface of shrimp Penaeus vannamei Boone, 1931 afflicted by the white faeces syndrome and the pond water in which it was reared. The pond water and the shrimp surface shared >45 % of the operational taxonomic units (OTUs), reflecting the influence of water quality on the bacterial community composition on the shrimp surface. Among these, the Proteobacteria formed the principal phyla and remained unaltered throughout the culture period. Bacteroidetes formed the second largest group across samples, followed by Cyanobacteria, Actinobacteria, Planctomycetes, Verrucomicrobia and Chloroflexi. The relative abundance levels of health indicator bacterial families such as Thiotrichaceae,Microbacteriaceae and Chitinophagaceae showed significant fluctuations on the shrimp surface. Disease indicators such as Rickettsiaceae, Mycobacteriaceae showed an increase in numbers on the shrimp surface. PICRUSt functional predictions revealed higher abundances of genes involved in metabolism and genetic information processing. The study provides valuable findings on the bacterial communities of rearing water and shrimp surface associated with white faeces syndrome.","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69688446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Genetic Diversity and Population Structure of Endangered Catfish Rita rita (Hamilton, 1822) Revealed by Heterologous DNA Microsatellite Markers 利用异源DNA微卫星标记揭示濒危鲶鱼Rita（Hamilton，1822）的遗传多样性和种群结构

Asian Fisheries Science Pub Date : 2021-06-30 DOI: 10.33997/j.afs.2021.34.2.007

Muhammad Forhad Ali, M. R. I. Sarder, M. Rahman, Md. Fazlul Awal Mollah, M. Salam

{"title":"Genetic Diversity and Population Structure of Endangered Catfish Rita rita (Hamilton, 1822) Revealed by Heterologous DNA Microsatellite Markers","authors":"Muhammad Forhad Ali, M. R. I. Sarder, M. Rahman, Md. Fazlul Awal Mollah, M. Salam","doi":"10.33997/j.afs.2021.34.2.007","DOIUrl":"https://doi.org/10.33997/j.afs.2021.34.2.007","url":null,"abstract":"Genetic information is essential for conservation and future aquaculture development of the endangered catfish Rita rita (Hamilton, 1822). Two hundred catfish, R. rita, 50 from four rivers, the Old Brahmaputra, Jamuna, Meghna and Kangsa were collected and analysed to evaluate the genetic diversity and population structure using five microsatellite primers (Cba06-KUL, Cba08-KUL, Cba09-KUL, Phy03-KUL and Phy07-KUL). Four of the five amplified loci were found polymorphic (P95) in all the populations and 46 alleles were recorded with 9 to 14 alleles per locus. Differences were observed in the total number of alleles ranging from 41 to 44, effective number of alleles from 29.96 to 37.46, observed heterozygosity from 0.57 to 0.76, Shannon’s information index from 2.09 to 2.30 and polymorphic information content from 0.84 to 0.88 among the four populations. Results exposed the highest levels of genetic diversity in the Meghna population while the lowest in the Kangsa population of R. rita. All the populations were significantly deviated (P < 0.001) from the Hardy-Weinberg equilibrium for all the loci. Nei’s genetic distance between populations ranged 0.007 to 0.017 with low overall genetic difference FST = 0.011 and high gene flow Nm = 24.333, indicating that R. rita populations were not subdivided. This study revealed a high level of gene diversity with deficiency in genetic heterogeneity in all the populations of R. rita, emphasising natural management, conservation and rehabilitation measures of this species.","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47137348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Substitution of Fishmeal with Black Soldier Fly Hermetia illucens Linnaeus, 1758 Larvae in Finfish Aquaculture – A Review 1758黑兵蝇幼虫替代鱼粉在鱼类养殖中的应用研究进展

Asian Fisheries Science Pub Date : 2021-06-30 DOI: 10.33997/j.afs.2021.34.2.001

M. Priyadarshana, C. Walpita, M. Naveenan, M. Magamage, H. Ruwandeepika

{"title":"Substitution of Fishmeal with Black Soldier Fly Hermetia illucens Linnaeus, 1758 Larvae in Finfish Aquaculture – A Review","authors":"M. Priyadarshana, C. Walpita, M. Naveenan, M. Magamage, H. Ruwandeepika","doi":"10.33997/j.afs.2021.34.2.001","DOIUrl":"https://doi.org/10.33997/j.afs.2021.34.2.001","url":null,"abstract":"The reliance of aquaculture feed industry on fishmeal has been challenged by ecological, economic, and ethical limitations leading fish nutritionists to look for viable alternatives, and conventional animal-based protein sources showed varying degrees of success in this regard. However, a non-conventional protein source, black soldier fly Hermetia illucens Linnaeus, 1758 larvae (BSFL), received due attention as a focal point in fish nutrition research. Though many studies were conducted on H. illucens as a potential protein source for fish, a comprehensive review is not available. Therefore, this article aims to review the existing literature on the use of BSFL as a fishmeal replacer in aquaculture. The nutrient composition of BSFL varied with the developmental stage and the composition of growing medium. High crude protein levels (40.4–56.2 %) and high crude fat levels (4.8–24.8 %) made BSFL suitable for high protein and high energy diet. Early prepupa was the best stage for harvesting, considering its high crude protein content and dry matter yield and less chitin content. Up to 100 % inclusion levels of BSFL meal were tested in a wide range of fish species. Most studies revealed that up to 50 % of fishmeal replacement would be possible without negative effects on the fish. Notable adverse effects were found beyond 50 % of fishmeal replacement, mainly due to high chitin levels in the pupal stage and high crude fat levels. Harvesting BSFL before the pupal stage and defattening made it possible to replace 100 % of fishmeal without adverse effects on fish.","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44497748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Production Trends, and Challenges for Biodiversity Conservation and Sustainable Fisheries Management of Kaptai Lake, the Largest Reservoir in Bangladesh 孟加拉国最大水库Kaptai湖的生物多样性保护和可持续渔业管理的生产趋势和挑战

Asian Fisheries Science Pub Date : 2021-06-30 DOI: 10.33997/j.afs.2021.34.2.004

Kamrul Hassan Suman, Md. Shakhawat Hossain, M. A. Salam, Quazi Sunjida Shawket Rupok, Md Niamul Haque

{"title":"Production Trends, and Challenges for Biodiversity Conservation and Sustainable Fisheries Management of Kaptai Lake, the Largest Reservoir in Bangladesh","authors":"Kamrul Hassan Suman, Md. Shakhawat Hossain, M. A. Salam, Quazi Sunjida Shawket Rupok, Md Niamul Haque","doi":"10.33997/j.afs.2021.34.2.004","DOIUrl":"https://doi.org/10.33997/j.afs.2021.34.2.004","url":null,"abstract":"Kaptai Lake (KL), the largest artificial lake in Bangladesh, supports an important inland open water fishery. Nevertheless, detailed studies on its fish diversity and environmental threats are still limited. Hence, a study was conducted to evaluate the current fish management scenarios, fish production, relative abundance to improve the production and biodiversity of KL. Data were collected from stakeholders through personal observation, focus group discussions, and cross-check interviews from September 2018 to July 2019. The fish production of KL increased from 1,200 metric tons (MT) in 1965–1966 to 10,577 MT in 2018–2019. The output of the lake was dominated by small fish remarkably, Gudusia chapra (Hamilton, 1822), Gonialosa manmina (Hamilton, 1822), and Corica soborna Hamilton, 1822, accounting for 64 % of the total production in 2018–2019. A total of seventy-six fish species were observed under ten orders, including seven exotic fish species. According to the IUCN Bangladesh, 14 % of total species were identified as vulnerable, 11 % as endangered, 3 % as critically endangered, 11 % as near threatened and 51 % as least concern. The study also identified that climate change and various human-driven causes threaten the fish production and biodiversity of this lake. These findings suggest that community-based fisheries management, protection of natural breeding grounds of carps, control of pollution, amendment of existing fishing laws, and collaborative research would be a necessary approach for mitigating the negative environmental impact of this lake. The overall practical knowledge of this investigation could assist in policymaking and further research.","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44372870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Length-Based Stock Assessment of Smith's Barb, Puntioplites proctozystron (Bleeker, 1865) (Cyprinidae) and Asian Redtail Catfish, Hemibagrus nemurus, (Valenciennes, 1840), (Bagridae) in a Multipurpose Reservoir in Thailand 泰国某多功能水库Smith’s Barb, Puntioplites proctozystron (Bleeker, 1865)(鲤科)和亚洲红尾鲶鱼Hemibagrus nemurus (Valenciennes, 1840) (Bagridae)的长度种群评价

Asian Fisheries Science Pub Date : 2021-06-30 DOI: 10.33997/j.afs.2021.34.2.005

Kajitpan Charernnate, P. Noranarttragoon, T. Jutagate

{"title":"Length-Based Stock Assessment of Smith's Barb, Puntioplites proctozystron (Bleeker, 1865) (Cyprinidae) and Asian Redtail Catfish, Hemibagrus nemurus, (Valenciennes, 1840), (Bagridae) in a Multipurpose Reservoir in Thailand","authors":"Kajitpan Charernnate, P. Noranarttragoon, T. Jutagate","doi":"10.33997/j.afs.2021.34.2.005","DOIUrl":"https://doi.org/10.33997/j.afs.2021.34.2.005","url":null,"abstract":"Catches from inland fisheries in Thailand are about 200,000 tonnes annually and plays an important role in food security and subsidiary income. However, fish stocks are seldom assessed because of the lack of catch and effort data. In this study, two fish stock assessment models, viz., relative yield per recruit and length-based spawning potential ratio, were used to evaluate the status of two species as well as to highlight their applications to datalimited situation in Thailand. The study was conducted at Kangkrajan Reservoir, Thailand, for two targeted species, viz., Smith's barb, Puntioplites proctozystron (Bleeker, 1865) and Asian redtail catfish, Hemibagrus nemurus (Valenciennes, 1840) using length frequency data. The data were collected throughout 2019. Both species showed isometric growth. Von Bertalanffy growth parameters were estimated. Asymptotic length, curvature parameter and theoretical age at length zero were 36.2 cm TL, 0.39 yr-1 and -0.28 yr for P. proctozystron, respectively, and 63.2 cm TL, 0.37 yr-1 and -0.32 yr for H. nemurus. The exploitation rates reveal that both species are slightly overfished. Sizes at 50 % maturity and 50 % selectivities were 17.8 and 23.5 cm TL for P. proctozystron, respectively, and 15.6 and 20.8 cm TL for H. nemurus. Considering both parameters, the size at first capture to sustain the fisheries of P. proctozystron and H. nemurus should be >18 cm and >30 cm, respectively, which can be achieved by mesh-size regulations.","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43422202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

COVID-19 and Small-Scale Fisheries in Southeast Asia: Impacts and Responses 2019冠状病毒病与东南亚小规模渔业:影响和应对

Asian Fisheries Science Pub Date : 2021-04-26 DOI: 10.33997/J.AFS.2021.34.1.011

A. Ferrer, R. Pomeroy, M. Akester, U. Muawanah, Watcharapong Chumchuen, Wen Chiat Lee, P. Hai, K. Viswanathan

{"title":"COVID-19 and Small-Scale Fisheries in Southeast Asia: Impacts and Responses","authors":"A. Ferrer, R. Pomeroy, M. Akester, U. Muawanah, Watcharapong Chumchuen, Wen Chiat Lee, P. Hai, K. Viswanathan","doi":"10.33997/J.AFS.2021.34.1.011","DOIUrl":"https://doi.org/10.33997/J.AFS.2021.34.1.011","url":null,"abstract":"This paper describes the impacts of and responses to COVID-19 of small-scale fisheries in six selected countries in Southeast Asia, including Indonesia, Malaysia, Myanmar, Philippines, Thailand, and Vietnam. The paper used a structured case study approach to analyse the impacts and responses and relied heavily on existing reports and data sources in each country. The pandemic has further revealed the vulnerability of small-scale fishing households in the region. Given the few assets of fisher households, their ability to cushion the negative impact of crises and shocks is limited. Fishers made adaptive responses such as direct fish marketing, online marketing, and home delivery services. While short-term responses of providing food and financial assistance have been helpful, long-term support to address pandemics such as COVID-19 and other stressors will require developing more resilient fishing households. The paper recommends several approaches and interventions to improve household resilience and to be better prepared for similar challenges and threats in the future. These include: i) strengthening the fishing households’ social network of friends, relatives, and neighbours to serve as both a social safety net and a bridge towards the transition to financial inclusion; ii) diversifying livelihood to reduce dependency on the fishery and provide for additional sources of income and food; iii) promoting financial inclusion through savings, credit, digital payment products, and insurance; iv) value chain upgrading through post-harvest fish handling and processing methods; and, v) providing access, especially for women, to social protection measures such as government health insurance and social security.","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45985535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 32

Status of Fish Assemblages in Four Major Reservoirs of Thailand 泰国四大水库鱼类群落现状

Asian Fisheries Science Pub Date : 2021-03-31 DOI: 10.33997/J.AFS.2021.34.1.001

A. Sakset, Suwimon Seehirunwong, Chatchai Preecha

{"title":"Status of Fish Assemblages in Four Major Reservoirs of Thailand","authors":"A. Sakset, Suwimon Seehirunwong, Chatchai Preecha","doi":"10.33997/J.AFS.2021.34.1.001","DOIUrl":"https://doi.org/10.33997/J.AFS.2021.34.1.001","url":null,"abstract":"Fish assemblage status is essential information for practical fishery resource management in productive water bodies. This study aimed to assess fish assemblages’ status and provide recommendations for practical fishery management in four major reservoirs in Thailand. Night-time samples were collected between January 2015 and December 2019 using gill net with multiple mesh sizes. Results obtained through univariate and multivariate analyses showed that the Pa Sak Jolasid Reservoir had the highest number of fish species (70), while the Rajjaprabha Reservoir had the lowest number (41). Eight species were identified as in danger of extinction and six species as alien. The percentage of the index of relative importance (% IRI) showed that the major species mainly belong to the family Cyprinidae. The forage and carnivorous fish ratio (F/C ratio) showed balanced communities in all reservoirs (4.4–9.2) except the Sirikit Reservoir (1.0). The evenness index (J') (0.53–0.67) and diversity index (H') (1.86–2.38) indicated moderate diversity and distribution in all reservoirs. Catch per unit effort (CPUE) value displayed a medium abundance in the Sirikit and Ubolratana Reservoirs (614.8 and 826.0 g.100 m of gill net/night, respectively), and a high abundance in the Rajjaprabha and Pa Sak Jolasid Reservoirs (1,087.2 and 1,012.5 g.100 m of gill net/night, respectively). In the overall assessment of fish assemblage status among the reservoirs, the Pa Sak Jolasid and Rajjaprabha Reservoirs showed the most desirable condition, while the Sirikit Reservoir showed the least desirable condition. These findings suggest the need to implement various practical fishery resource management, such as banning the introduction of invasive exotic species, and establishing conservation measures for species on the list of extinction.","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49533275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Diet of Exotic Pirapitinga Piaractus brachypomus (Cuvier, 1818) From Vembanad-Kole Wetland, India, as Inferred From Gut Content Analysis and DNA Barcoding 来自印度Vembanad-Kole湿地的外来piapitinga Piaractus brachypomus (Cuvier, 1818)的饮食，根据肠道含量分析和DNA条形码推断

Asian Fisheries Science Pub Date : 2021-03-31 DOI: 10.33997/J.AFS.2021.34.1.005

V. Anupama, Smrithy Raj, S. Devi, Appukuttan Nair Biju Kumar

{"title":"Diet of Exotic Pirapitinga Piaractus brachypomus (Cuvier, 1818) From Vembanad-Kole Wetland, India, as Inferred From Gut Content Analysis and DNA Barcoding","authors":"V. Anupama, Smrithy Raj, S. Devi, Appukuttan Nair Biju Kumar","doi":"10.33997/J.AFS.2021.34.1.005","DOIUrl":"https://doi.org/10.33997/J.AFS.2021.34.1.005","url":null,"abstract":"Gut contents of the exotic characid fish Piaractus brachypomus (Cuvier, 1818) that escaped into the Vembanad-Kole Wetland, India, during the floods were examined for their gut food spectrum. The qualitative analysis of gut contents showed that the fish is an omnivore with detritus (27 %) as the most dominant food item followed by, plant matter (25 %), crabs (16 %), molluscs (12 %), fish (11 %) and insects (7 %), respectively. DNA barcoding of the gut contents revealed taxa such as Puntius mahecola (Valenciennes, 1844) (Cyprinid fish), Bellamaya sp. (Mollusca, Gastropoda, Viviparidae), Spiralothelphusa sp. (Crustacea, Brachyura, Gecarcinucidae) and Ictinogomphus sp. (Insecta, Odonata, Gomphidae) among diet contents. Ontogenic diet shift was not recorded, and none of the fishes showed empty guts, indicating the higher feeding rate and abundance of food in the habitat. The most predominant food item of P. brachypomus in the Vembanad-Kol wetland system is crabs in terms of percentage occurrence, percentage number, percentage volume, index of preponderance, and index of relative importance. Piaractus brachypomus showed greater variations in diet spectrum from their frugivorous nature in the home range (Amazon basin) to a more generalist heterogeneous feeding nature in the introduced ecosystem. The study found that in a highly biodiverse ecosystem, the introduced alien fish may compete with native fish and feed on native organisms. The paper suggests a precautionary approach in flood plain aquaculture, especially with the increase in extreme climatic events and holistic studies on invasion biology to manage invasive species.","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45395961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1