Pub Date : 2023-09-16DOI: 10.33997/j.afs.2023.36.3.003
RHODA MAE C. SIMORA, CINDY D. ARMADA, KARMELIE JANE M. MONAYA
Intermediate flying fish, Cheilopogon intermedius, Parin, 1961, is a popular source of inexpensive animal protein in the Philippines, but it remains susceptible to deterioration during processing. The study evaluated the sensory, microbiological, and physico-chemical characteristics of flying fish, C. intermedius stored at ambient conditions (27– 29 °C) and on ice (1–2 °C) storage. The storage duration of flying fish was 8 h at ambient temperature and around 12 days in ice. A ten-member taste panel rejected raw fish due to strong fishy to sour odours and soft texture. Similarly, cooked samples were rejected based on sour and ammoniacal odours, mushy texture, and a bitter taste. Results of sensory evaluation correlated with those of microbial and chemical analyses. Bacteria multiplied rapidly at ambient temperature with values of 11.05 log CFU.g-1 and 7.55 log CFU.g-1 (P < 0.05) for total viable count (TVC), and H2Sproducers count, respectively, at the end of the 20-h storage. In comparison, bacterial counts remained below rejection limits until the end of the storage period for samples stored in ice. Total volatile base nitrogen (TVB-N) and trimethylamine nitrogen (TMA-N) accumulated rapidly at ambient temperature, reaching 86.86 mg.100 g-1 and 35.65 mg.100 g-1, respectively, at the end of the storage period. In ice, TVB-N, TMA-N, and histamine values were slowed down, reaching rejection limits only at the end of the storage period. Moreover, the K value increased linearly at ambient storage, while a gradual increase was observed for samples stored in ice. Therefore, without the application of adequate icing, flying fish would undergo rapid decomposition at ambient temperature.
{"title":"Quality Changes in Intermediate Flying Fish, Cheilopogon intermedius Parin, 1961, During Ambient and Ice Storage","authors":"RHODA MAE C. SIMORA, CINDY D. ARMADA, KARMELIE JANE M. MONAYA","doi":"10.33997/j.afs.2023.36.3.003","DOIUrl":"https://doi.org/10.33997/j.afs.2023.36.3.003","url":null,"abstract":"Intermediate flying fish, Cheilopogon intermedius, Parin, 1961, is a popular source of inexpensive animal protein in the Philippines, but it remains susceptible to deterioration during processing. The study evaluated the sensory, microbiological, and physico-chemical characteristics of flying fish, C. intermedius stored at ambient conditions (27– 29 °C) and on ice (1–2 °C) storage. The storage duration of flying fish was 8 h at ambient temperature and around 12 days in ice. A ten-member taste panel rejected raw fish due to strong fishy to sour odours and soft texture. Similarly, cooked samples were rejected based on sour and ammoniacal odours, mushy texture, and a bitter taste. Results of sensory evaluation correlated with those of microbial and chemical analyses. Bacteria multiplied rapidly at ambient temperature with values of 11.05 log CFU.g-1 and 7.55 log CFU.g-1 (P < 0.05) for total viable count (TVC), and H2Sproducers count, respectively, at the end of the 20-h storage. In comparison, bacterial counts remained below rejection limits until the end of the storage period for samples stored in ice. Total volatile base nitrogen (TVB-N) and trimethylamine nitrogen (TMA-N) accumulated rapidly at ambient temperature, reaching 86.86 mg.100 g-1 and 35.65 mg.100 g-1, respectively, at the end of the storage period. In ice, TVB-N, TMA-N, and histamine values were slowed down, reaching rejection limits only at the end of the storage period. Moreover, the K value increased linearly at ambient storage, while a gradual increase was observed for samples stored in ice. Therefore, without the application of adequate icing, flying fish would undergo rapid decomposition at ambient temperature.","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":"234 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135305601","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}
Pub Date : 2023-09-14DOI: 10.33997/j.afs.2023.36.3.002
ANTAR SARKAR, SAIFUDDIN RANA, PRANTA BHOWMIK, MD. NAZMUL HASAN, SHAHIDA ARFINE SHIMUL, SK. AHMAD AL NAHID
Suckermouth armoured catfish of the genus Pterygoplichthys (Siluriformes: Loricariidae) are significant threats to aquatic biodiversity, ecosystems, habitats, and fishery production in different countries. Their unique characteristics and adaptive features help their successful invasion. These fish harm fish habitats, compete for food and space, prey on fish eggs, and displace the native fish populations. They erode river banks, alter benthic ecology, make holes in the river bank, and remove aquatic plants. Elimination, control, and intrusion prevention are possible management strategies. Utilising them as food and preparing value-added products and byproducts using them are viable ways to reduce their number. Management is challenging, owing to their tolerance and excellent adaptability. With severe dangers to Bangladesh's fisheries industry and aquatic environment, suckermouth armoured catfish have invaded natural waterbodies and aquaculture ponds. There is a lack of accurate information on invasion status, types of invading species, and potential dangers of invasion to create a management framework in Bangladesh. Therefore, this review introduces the key characteristics, habitats, invasion impacts, and management and utilisation aspects of suckermouth armoured catfish in different countries. The review may help in understanding how they affect native fish, aquatic organisms, habitats, and the aquatic environment globally. Finally, what kind of threats they may pose and how they can be managed sustainably in Bangladesh.
{"title":"A Review of Suckermouth Armoured Catfish (Siluriformes: Loricariidae) Invasion, Impacts and Management: Is Its Invasion a Threat to Bangladesh’s Fisheries Sector?","authors":"ANTAR SARKAR, SAIFUDDIN RANA, PRANTA BHOWMIK, MD. NAZMUL HASAN, SHAHIDA ARFINE SHIMUL, SK. AHMAD AL NAHID","doi":"10.33997/j.afs.2023.36.3.002","DOIUrl":"https://doi.org/10.33997/j.afs.2023.36.3.002","url":null,"abstract":"Suckermouth armoured catfish of the genus Pterygoplichthys (Siluriformes: Loricariidae) are significant threats to aquatic biodiversity, ecosystems, habitats, and fishery production in different countries. Their unique characteristics and adaptive features help their successful invasion. These fish harm fish habitats, compete for food and space, prey on fish eggs, and displace the native fish populations. They erode river banks, alter benthic ecology, make holes in the river bank, and remove aquatic plants. Elimination, control, and intrusion prevention are possible management strategies. Utilising them as food and preparing value-added products and byproducts using them are viable ways to reduce their number. Management is challenging, owing to their tolerance and excellent adaptability. With severe dangers to Bangladesh's fisheries industry and aquatic environment, suckermouth armoured catfish have invaded natural waterbodies and aquaculture ponds. There is a lack of accurate information on invasion status, types of invading species, and potential dangers of invasion to create a management framework in Bangladesh. Therefore, this review introduces the key characteristics, habitats, invasion impacts, and management and utilisation aspects of suckermouth armoured catfish in different countries. The review may help in understanding how they affect native fish, aquatic organisms, habitats, and the aquatic environment globally. Finally, what kind of threats they may pose and how they can be managed sustainably in Bangladesh.","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134910751","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}
In March 2020, the COVID-19 pandemic rapidly spread across Bangladesh, affecting various sectors, including aquaculture. However, there is a lack of evidence regarding the effects on aquaculture production and profitability in the country. The present study addresses this gap and investigates the impact of the COVID-19 pandemic using a convenience questionnaire survey utilising face-to-face and telephonic interviews with 499 fish farmers from five prominent fish-culture regions (Satkhira, Khulna, Madaripur, Bhola, and Mymensingh) in Bangladesh from April to August 2020. The results show aquaculture production losses averaging 29.1 % during the pandemic compared to the pre-pandemic period. Before the COVID-19 pandemic outbreak, the farmers reported a profit of USD3813 per hectare, which turned into a loss of USD2565.4 per hectare during the pandemic period. The standard multiple linear regression analysis indicated that large farms experienced a more significant impact on aquaculture production loss and economic loss during the pandemic period compared to small farms [β = 0.15, P = 0.029]. The causes for the production loss were identified by rank based quotient (RBQ), indicating that increased fish transportation costs and prices of seed and feed dominated during the lockdown. The lockdown and movement restrictions also reduced selling prices because of fewer buyers. The government provided financial support to the fish farmers, but only onethird (36 %) of the respondents received financial aid. The study suggests implementing medium and long-term measures, such as strengthening communication networks, digital marketing strategies and developing strategic planning initiatives to improve disaster management and resilience to mitigate the effects of the pandemic.
2020年3月，COVID-19大流行在孟加拉国迅速蔓延，影响到包括水产养殖在内的各个部门。然而，缺乏关于对该国水产养殖生产和盈利能力的影响的证据。本研究填补了这一空白，并于2020年4月至8月对孟加拉国五个主要养鱼区(satkira、kulna、Madaripur、Bhola和Mymensingh)的499名养鱼户进行了面对面和电话访谈，采用方便问卷调查的方式调查了COVID-19大流行的影响。结果显示，与大流行前相比，大流行期间水产养殖生产损失平均为29.1%。在新冠疫情爆发前，农民报告每公顷利润为3813美元，在疫情期间，每公顷损失为2565.4美元。标准多元线性回归分析表明，疫情期间，大型养殖场对水产养殖生产损失和经济损失的影响比小型养殖场更为显著[β = 0.15, P = 0.029]。通过基于秩的商(RBQ)确定了生产损失的原因，表明在封锁期间，鱼类运输成本增加以及种子和饲料价格占主导地位。由于买家减少，封锁和行动限制也降低了销售价格。政府为养鱼户提供了财政支持，但只有三分之一(36%)的回答者得到了财政援助。该研究建议实施中期和长期措施，例如加强通信网络、数字营销战略和制定战略规划举措，以改善灾害管理和复原力，以减轻大流行的影响。
{"title":"Impact of COVID-19 Pandemic on Aquaculture Production and Profitability in Bangladesh: A Comprehensive Analysis","authors":"REZAUL HOQUE, MD. INJA-MAMUN HAQUE, MAHMUD HASAN, RANAJIT KUMAR, TAPAN MAZUMDER, A.F.M. NAZMUS SALEHIN, RIPON KUMAR GHOSH, MD. ZAKIUL ALAM, SHANKAR CHANDRA MANDAL","doi":"10.33997/j.afs.2023.36.3.001","DOIUrl":"https://doi.org/10.33997/j.afs.2023.36.3.001","url":null,"abstract":"In March 2020, the COVID-19 pandemic rapidly spread across Bangladesh, affecting various sectors, including aquaculture. However, there is a lack of evidence regarding the effects on aquaculture production and profitability in the country. The present study addresses this gap and investigates the impact of the COVID-19 pandemic using a convenience questionnaire survey utilising face-to-face and telephonic interviews with 499 fish farmers from five prominent fish-culture regions (Satkhira, Khulna, Madaripur, Bhola, and Mymensingh) in Bangladesh from April to August 2020. The results show aquaculture production losses averaging 29.1 % during the pandemic compared to the pre-pandemic period. Before the COVID-19 pandemic outbreak, the farmers reported a profit of USD3813 per hectare, which turned into a loss of USD2565.4 per hectare during the pandemic period. The standard multiple linear regression analysis indicated that large farms experienced a more significant impact on aquaculture production loss and economic loss during the pandemic period compared to small farms [β = 0.15, P = 0.029]. The causes for the production loss were identified by rank based quotient (RBQ), indicating that increased fish transportation costs and prices of seed and feed dominated during the lockdown. The lockdown and movement restrictions also reduced selling prices because of fewer buyers. The government provided financial support to the fish farmers, but only onethird (36 %) of the respondents received financial aid. The study suggests implementing medium and long-term measures, such as strengthening communication networks, digital marketing strategies and developing strategic planning initiatives to improve disaster management and resilience to mitigate the effects of the pandemic.","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135981413","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}
Pub Date : 2023-07-03DOI: 10.33997/j.afs.2023.36.2.005
Tran Van Viet, Au Van Hoa, Huynh Truong Giang, V. Ut
The Mekong Delta produces about 70 % of Vietnam's national aquaculture output, and water quality management is a key factor in maintaining high levels of production and profitability. Effective water management strategies depend on understanding the spatial and temporal variations in water quality along major waterways. Therefore, this study aimed to assess the spatial and temporal fluctuation of water quality in the waterways of five provinces with intensive aquaculture operations in the Mekong Delta. The study sites included two inland provinces (An Giang and Can Tho) where striped catfish, Pangasianodon hypophthalmus (Sauvage, 1878), is farmed, and three coastal provinces (Soc Trang, Bac Lieu, and Ca Mau) where white leg shrimp, Litopenaeus vannamei (Boone, 1931), and black tiger shrimp Penaeus monodon Fabricius, 1798, are cultured. At each sampling site, physicochemical parameters were monitored for 12 months on the main rivers which supply water to aquaculture systems. Water quality data were analysed and compared based on the coefficient of variation (CV), Pearson correlation coefficients to identify relationships among variables and principal component analysis (PCA) to identify 2–3 key parameters having the most significant influence on spatial and temporal variation in water quality in each province. BOD, COD, PO4 3-, S2-, NO2 - and NO3 - were highly variable (CV 40–120 %). Significant interrelationships ranged from -0.5 to 0.5 between many water quality parameters. Overall, water in most provinces was considered polluted. However, the water quality parameters, except for S2- and NO2 - , were within acceptable levels specified by National Technical Regulation on Surface Water Quality for Protection of Aquatic Life.
{"title":"Variation of Water Quality in Intensive Aquaculture Areas of the Mekong Delta, Vietnam","authors":"Tran Van Viet, Au Van Hoa, Huynh Truong Giang, V. Ut","doi":"10.33997/j.afs.2023.36.2.005","DOIUrl":"https://doi.org/10.33997/j.afs.2023.36.2.005","url":null,"abstract":"The Mekong Delta produces about 70 % of Vietnam's national aquaculture output, and water quality management is a key factor in maintaining high levels of production and profitability. Effective water management strategies depend on understanding the spatial and temporal variations in water quality along major waterways. Therefore, this study aimed to assess the spatial and temporal fluctuation of water quality in the waterways of five provinces with intensive aquaculture operations in the Mekong Delta. The study sites included two inland provinces (An Giang and Can Tho) where striped catfish, Pangasianodon hypophthalmus (Sauvage, 1878), is farmed, and three coastal provinces (Soc Trang, Bac Lieu, and Ca Mau) where white leg shrimp, Litopenaeus vannamei (Boone, 1931), and black tiger shrimp Penaeus monodon Fabricius, 1798, are cultured. At each sampling site, physicochemical parameters were monitored for 12 months on the main rivers which supply water to aquaculture systems. Water quality data were analysed and compared based on the coefficient of variation (CV), Pearson correlation coefficients to identify relationships among variables and principal component analysis (PCA) to identify 2–3 key parameters having the most significant influence on spatial and temporal variation in water quality in each province. BOD, COD, PO4 3-, S2-, NO2 - and NO3 - were highly variable (CV 40–120 %). Significant interrelationships ranged from -0.5 to 0.5 between many water quality parameters. Overall, water in most provinces was considered polluted. However, the water quality parameters, except for S2- and NO2 - , were within acceptable levels specified by National Technical Regulation on Surface Water Quality for Protection of Aquatic Life.","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42269055","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}
Pub Date : 2023-06-30DOI: 10.33997/j.afs.2023.36.2.004
N. T. Suong, Truyen Nha Dinh Hue, Mai Dang Tien, N. Thinh, N. P. Thuong
Skeletal deformities are a common issue that poses a challenge that hinders the production of cultured finfish worldwide. The present study aims to describe for the first time skeletal deformities in cultured striped catfish Pangasianodon hypophthalmus (Sauvage, 1878) from the Mekong Delta, Vietnam. A total of 68 striped catfish were collected from three nurseries in highly concentrated areas of Long An and Dong Thap provinces. These provinces are known for their numerous hatcheries and nursing farms of P. hypophthalmus in the country. The skeletal deformities recorded included saddleback syndrome, missing pectoral fins, lordosis and kyphosis, unilateral deformities of the opercular complex bones, branchiostegal ray and lower jaw deformities. Abnormalities in bone morphotypes between normal and deformed fish were analysed using X-ray scanning and double staining (alizarin red and alcian blue) methods. The morphological abnormalities, in general, can reduce the fillet yield of fish, thereby affecting their market value. Since P. hypophthalmus is the most important freshwater fish exported from the Mekong Delta, a regular monitoring program of skeletal deformities can contribute to identifying improved rearing protocols and enhance the product quality available in the markets.
{"title":"Skeletal Deformities in Cultured Striped Catfish Pangasianodon hypophthalmus (Sauvage, 1878) in the Mekong Delta, Vietnam","authors":"N. T. Suong, Truyen Nha Dinh Hue, Mai Dang Tien, N. Thinh, N. P. Thuong","doi":"10.33997/j.afs.2023.36.2.004","DOIUrl":"https://doi.org/10.33997/j.afs.2023.36.2.004","url":null,"abstract":"Skeletal deformities are a common issue that poses a challenge that hinders the production of cultured finfish worldwide. The present study aims to describe for the first time skeletal deformities in cultured striped catfish Pangasianodon hypophthalmus (Sauvage, 1878) from the Mekong Delta, Vietnam. A total of 68 striped catfish were collected from three nurseries in highly concentrated areas of Long An and Dong Thap provinces. These provinces are known for their numerous hatcheries and nursing farms of P. hypophthalmus in the country. The skeletal deformities recorded included saddleback syndrome, missing pectoral fins, lordosis and kyphosis, unilateral deformities of the opercular complex bones, branchiostegal ray and lower jaw deformities. Abnormalities in bone morphotypes between normal and deformed fish were analysed using X-ray scanning and double staining (alizarin red and alcian blue) methods. The morphological abnormalities, in general, can reduce the fillet yield of fish, thereby affecting their market value. Since P. hypophthalmus is the most important freshwater fish exported from the Mekong Delta, a regular monitoring program of skeletal deformities can contribute to identifying improved rearing protocols and enhance the product quality available in the markets.","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48499928","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}
Pub Date : 2023-06-24DOI: 10.33997/j.afs.2023.36.2.003
J. W. Devaa, Stalin Nithaniyal, Vimalanathane Panneerselvam, Ramesh Uthandakalaipandian
Rainbow trout, Oncorhynchus mykiss (Walbaum, 1792), is a popular cold-water fish widely distributed and farmed globally. In the nineteenth century, rainbow trout were introduced into India, and since then, it has gradually spread and established itself as one of the most prevalent non-native fish. In Southern India, rainbow trout were introduced from New Zealand in 1909 in the Ooty region of the Western Ghats, followed by introductions in other coldwater regions in the Peninsular uplands such as Munnar and Kodaikanal. Continuous introductions were done from various geographical locations at different periods to increase O. mykiss stocks in the Peninsular upland regions. Despite being regularly introduced in the streams of Munnar, Ooty, and Kodaikanal of Southern India, they still have not become self-sustaining, and genetic diversity has been suggested as a potential underlying factor. Therefore, this study aimed to resolve these questions and explore the structure and origin of Southern Indian stocks by conducting a population genetic study. The Y-linked marker of the trout stocks sampled from Munnar, Ooty, and Kodaikanal was compared with that of the native populations from North America. The results showed less proportion of inter-population genetic variation, suggesting that Southern Indian stocks were derived from multiple origins of population, with a great majority of parental populations belonging to the coastal rainbow trout from North America. This study revealed no considerable genetic differences among the Southern Indian stocks and reported the major ecotype as the Steelhead trout, Oncorhynchus mykiss irideus (Gibbons, 1955).
{"title":"Origin and History of Introduction of Rainbow Trout, Oncorhynchus mykiss (Walbaum, 1792) Stocks in Southern India As Inferred From Y-linked Marker","authors":"J. W. Devaa, Stalin Nithaniyal, Vimalanathane Panneerselvam, Ramesh Uthandakalaipandian","doi":"10.33997/j.afs.2023.36.2.003","DOIUrl":"https://doi.org/10.33997/j.afs.2023.36.2.003","url":null,"abstract":"Rainbow trout, Oncorhynchus mykiss (Walbaum, 1792), is a popular cold-water fish widely distributed and farmed globally. In the nineteenth century, rainbow trout were introduced into India, and since then, it has gradually spread and established itself as one of the most prevalent non-native fish. In Southern India, rainbow trout were introduced from New Zealand in 1909 in the Ooty region of the Western Ghats, followed by introductions in other coldwater regions in the Peninsular uplands such as Munnar and Kodaikanal. Continuous introductions were done from various geographical locations at different periods to increase O. mykiss stocks in the Peninsular upland regions. Despite being regularly introduced in the streams of Munnar, Ooty, and Kodaikanal of Southern India, they still have not become self-sustaining, and genetic diversity has been suggested as a potential underlying factor. Therefore, this study aimed to resolve these questions and explore the structure and origin of Southern Indian stocks by conducting a population genetic study. The Y-linked marker of the trout stocks sampled from Munnar, Ooty, and Kodaikanal was compared with that of the native populations from North America. The results showed less proportion of inter-population genetic variation, suggesting that Southern Indian stocks were derived from multiple origins of population, with a great majority of parental populations belonging to the coastal rainbow trout from North America. This study revealed no considerable genetic differences among the Southern Indian stocks and reported the major ecotype as the Steelhead trout, Oncorhynchus mykiss irideus (Gibbons, 1955).","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44079966","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}
Pub Date : 2023-06-06DOI: 10.33997/j.afs.2023.36.2.002
Tô Văn Phương, K. Q. Nguyen, L. T. Nguyen, N. Vu
Vietnam’s capture fisheries play a significant role in the country’s socioeconomic development. However, COVID-19 has seriously impacted Vietnam’s coastal communities and marine fisheries. This study aimed to assess the effect of the COVID-19 pandemic on Vietnam’s marine fisheries, recommend solutions to help fishers recover their operations and suggest long-term policies for similar pandemics in the future. A survey was conducted in 12 coastal provinces across Vietnam’s North, North Central, South Central and South West regions using mixed methods, including online questionnaires and group discussions via Google Meet from June to August 2021. The study involved 109 fishing vessel captains, fishers and owners who participated when social distancing in most coastal provinces was still enforced. The results showed that 87% of the fishers experienced negative to strongly negative impacts of COVID-19 on their fisheries activities. The most significant difficulties faced by fishers were accessing the fishing port and dealing with the logistics procedures of docking and departure, accounting for 77.1 %, 72.5 % and 76.1 %, respectively. The fishers also reported reduced seafood demand and price, and difficulties in seafood transportation. Most respondents expected the government to effectively support fisheries activities and facilitate seafood marketing during an ongoing pandemic. The results of this study are crucial in developing policy solutions to restore disrupted fish supply chains, enhancing online selling or e-commerce in fisheries marketing, and implementing timely subsidy policies to support Vietnam’s marine fisheries sectors during a pandemic.
{"title":"Impacts of the COVID-19 Pandemic on Vietnam's Marine Fisheries","authors":"Tô Văn Phương, K. Q. Nguyen, L. T. Nguyen, N. Vu","doi":"10.33997/j.afs.2023.36.2.002","DOIUrl":"https://doi.org/10.33997/j.afs.2023.36.2.002","url":null,"abstract":"Vietnam’s capture fisheries play a significant role in the country’s socioeconomic development. However, COVID-19 has seriously impacted Vietnam’s coastal communities and marine fisheries. This study aimed to assess the effect of the COVID-19 pandemic on Vietnam’s marine fisheries, recommend solutions to help fishers recover their operations and suggest long-term policies for similar pandemics in the future. A survey was conducted in 12 coastal provinces across Vietnam’s North, North Central, South Central and South West regions using mixed methods, including online questionnaires and group discussions via Google Meet from June to August 2021. The study involved 109 fishing vessel captains, fishers and owners who participated when social distancing in most coastal provinces was still enforced. The results showed that 87% of the fishers experienced negative to strongly negative impacts of COVID-19 on their fisheries activities. The most significant difficulties faced by fishers were accessing the fishing port and dealing with the logistics procedures of docking and departure, accounting for 77.1 %, 72.5 % and 76.1 %, respectively. The fishers also reported reduced seafood demand and price, and difficulties in seafood transportation. Most respondents expected the government to effectively support fisheries activities and facilitate seafood marketing during an ongoing pandemic. The results of this study are crucial in developing policy solutions to restore disrupted fish supply chains, enhancing online selling or e-commerce in fisheries marketing, and implementing timely subsidy policies to support Vietnam’s marine fisheries sectors during a pandemic.","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41780546","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}
Pub Date : 2023-05-10DOI: 10.33997/j.afs.2023.36.2.001
Denise Vergara Miranda, Victor Marco Emmanuel N. Ferriols
Blood cockles, Tegillarca granosa (Linnaeus, 1758), were induced to spawn by temperature stimulation. Larval to spat rearing was accomplished in the hatchery facility of the Institute of Aquaculture of the University of the Philippines Visayas. The survival rate from day 1 larval stage to day 120 spat stage was 2.48 % (15,200) from the initial 614,100 eggs reared. The fertilised eggs (average size: 50.23 ± 5.18 µm in diameter) passed through the morula stage 5 h postfertilisation and reached the trochophore stage after 8 h. Day 1 D-shaped larvae (average size: 84.60 ± 3.90 µm length (l) and 66.36 ± 1.92 µm height (h)) transformed into umboned larvae by day 7. The majority of the larvae reached the advanced umbo stage by day 12 (average size: 204.52 ± 21.06 µm l and 178.24 ± 17.04 µm h). By day 20, loss of velum and foot development in larvae were observed, marking the beginning of the pediveliger stage. The growth of post-set larvae starting from the initial settling stage at day 30 (average size: 360.50 ± 52.10 µm l and 309.56 ± 34.56 µm h) to day 120 (average shell length: 3.870 ± 0.400 mm) was periodically monitored. Cockle spats had squarish shells with central elevation and visible radial ribs resembling the morphological characteristics of adult T. granosa. Only Isochrysis galbana Parke, 1949, was given as food for the cockles throughout the rearing activity. Further refining of larval and post-set rearing methodology is necessary for future mass production of cockle seeds in the Philippines.
{"title":"Initial Attempts on Spawning and Larval Rearing of the Blood Cockle, Tegillarca granosa (Linnaeus, 1758), in the Philippines","authors":"Denise Vergara Miranda, Victor Marco Emmanuel N. Ferriols","doi":"10.33997/j.afs.2023.36.2.001","DOIUrl":"https://doi.org/10.33997/j.afs.2023.36.2.001","url":null,"abstract":"Blood cockles, Tegillarca granosa (Linnaeus, 1758), were induced to spawn by temperature stimulation. Larval to spat rearing was accomplished in the hatchery facility of the Institute of Aquaculture of the University of the Philippines Visayas. The survival rate from day 1 larval stage to day 120 spat stage was 2.48 % (15,200) from the initial 614,100 eggs reared. The fertilised eggs (average size: 50.23 ± 5.18 µm in diameter) passed through the morula stage 5 h postfertilisation and reached the trochophore stage after 8 h. Day 1 D-shaped larvae (average size: 84.60 ± 3.90 µm length (l) and 66.36 ± 1.92 µm height (h)) transformed into umboned larvae by day 7. The majority of the larvae reached the advanced umbo stage by day 12 (average size: 204.52 ± 21.06 µm l and 178.24 ± 17.04 µm h). By day 20, loss of velum and foot development in larvae were observed, marking the beginning of the pediveliger stage. The growth of post-set larvae starting from the initial settling stage at day 30 (average size: 360.50 ± 52.10 µm l and 309.56 ± 34.56 µm h) to day 120 (average shell length: 3.870 ± 0.400 mm) was periodically monitored. Cockle spats had squarish shells with central elevation and visible radial ribs resembling the morphological characteristics of adult T. granosa. Only Isochrysis galbana Parke, 1949, was given as food for the cockles throughout the rearing activity. Further refining of larval and post-set rearing methodology is necessary for future mass production of cockle seeds in the Philippines.","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47977094","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}
Pub Date : 2023-03-31DOI: 10.33997/j.afs.2023.36.1.005
W. Taparhudee, Roongparit Jongjaraunsuk
Changes in fish behaviour caused by stress are difficult to measure. In this study, tracker software-based computer vision techniques were applied, with formalin used as a stressor. At different formalin concentrations, stress responses of Nile tilapia, Oreochromis niloticus (Linnaeus, 1758), were examined for fish swimming velocity (FSV) and behaviour. Seven treatments included 1 (control) without formalin, with treatments 2–7 consisting of 100, 200, 300, 400, 500 and 600 mg.L-1formalin concentration, respectively. Three (25 × 51 × 31 cm, width × length × height) glass tanks were 80 % filled with water for each trial. Each tank contained three fish with weights of 0.5–1.0 g, and the FSV of each fish was recorded for 120 min after exposure to formalin. Average FSV statistically differed (P < 0.05) at different formalin concentrations. Treatment 1 (control) gave the highest FSV at 0.038 ± 0.005 m.S-1 followed by treatments 2 (100 mg.L-1) and 3 (200 mg.L-1) at 0.020 ± 0.013 and 0.018 ± 0.020 m.S-1, respectively. Treatments 4 (300 mg.L-1), 5 (400 mg.L-1), 6 (500 mg.L-1) and 7 (600 mg.L-1) recorded 0.007 ± 0.010, 0.006 ± 0.090, 0.004 ± 0.008 and 0.003 ± 0.007 m.S-1, respectively. Differences in FSV at each concentration interval were applied to indicate the behavioural expression of fish response to stress in phase III (tertiary responses). Results indicated that computer vision techniques were suitable for studying Nile tilapia behaviour, with possible applications in other aquatic animals. Highlights of this technique included continuous real-time results to monitor fish stress using a non-invasive method.
{"title":"Behavioural Response Detection in Nile Tilapia, Oreochromis niloticus (Linnaeus, 1758) With Different Formalin Concentrations Using Tracker Software-Based Computer Vision Techniques","authors":"W. Taparhudee, Roongparit Jongjaraunsuk","doi":"10.33997/j.afs.2023.36.1.005","DOIUrl":"https://doi.org/10.33997/j.afs.2023.36.1.005","url":null,"abstract":"Changes in fish behaviour caused by stress are difficult to measure. In this study, tracker software-based computer vision techniques were applied, with formalin used as a stressor. At different formalin concentrations, stress responses of Nile tilapia, Oreochromis niloticus (Linnaeus, 1758), were examined for fish swimming velocity (FSV) and behaviour. Seven treatments included 1 (control) without formalin, with treatments 2–7 consisting of 100, 200, 300, 400, 500 and 600 mg.L-1formalin concentration, respectively. Three (25 × 51 × 31 cm, width × length × height) glass tanks were 80 % filled with water for each trial. Each tank contained three fish with weights of 0.5–1.0 g, and the FSV of each fish was recorded for 120 min after exposure to formalin. Average FSV statistically differed (P < 0.05) at different formalin concentrations. Treatment 1 (control) gave the highest FSV at 0.038 ± 0.005 m.S-1 followed by treatments 2 (100 mg.L-1) and 3 (200 mg.L-1) at 0.020 ± 0.013 and 0.018 ± 0.020 m.S-1, respectively. Treatments 4 (300 mg.L-1), 5 (400 mg.L-1), 6 (500 mg.L-1) and 7 (600 mg.L-1) recorded 0.007 ± 0.010, 0.006 ± 0.090, 0.004 ± 0.008 and 0.003 ± 0.007 m.S-1, respectively. Differences in FSV at each concentration interval were applied to indicate the behavioural expression of fish response to stress in phase III (tertiary responses). Results indicated that computer vision techniques were suitable for studying Nile tilapia behaviour, with possible applications in other aquatic animals. Highlights of this technique included continuous real-time results to monitor fish stress using a non-invasive method.","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46798583","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}
Pub Date : 2023-03-10DOI: 10.33997/j.afs.2023.36.1.004
Gazi Md Nurul Islam, T. S. Yew, Muhammad Abrar ul haq
Poverty in small-scale fisheries is a global issue; most of the time, the solution to poverty is discussed through economic variables. Scholars highlight the contribution of social capital factors to the livelihoods of small-scale fishing communities and suggest that social aspects can be used as an alternative solution to reduce poverty. The concept of social capital has been extensively used to explain the relationship between social capital factors and wellbeing. The role of social capital in the well-being of small-scale fisher communities in Malaysia needs to be clarified. The current study investigates the contribution of various livelihood assets to the household income of small-scale fishers in Malaysia. Data for the survey were collected from 182 respondents from across multiple fishing villages on Langkawi Island, off the west coast of Peninsular Malaysia, using a structured questionnaire. The partial least square (PLS) technique was applied for statistical analysis. The study’s empirical findings depict that social capital, trust, job experience, and financial capital are important factors contributing to fishers' household income. The results show that the contribution of social capital and trust factors are significant to household income, indicating that social factors are essential in improving the well-being of small-scale fisher households in Malaysia. Policy for livelihood improvement of small-scale fisheries in Malaysia needs to prioritise investments in financial, human, natural and physical capital assets.
{"title":"Social Capital and Well-Being of Small-Scale Fishers in the West Coast Island of Peninsular Malaysia","authors":"Gazi Md Nurul Islam, T. S. Yew, Muhammad Abrar ul haq","doi":"10.33997/j.afs.2023.36.1.004","DOIUrl":"https://doi.org/10.33997/j.afs.2023.36.1.004","url":null,"abstract":"Poverty in small-scale fisheries is a global issue; most of the time, the solution to poverty is discussed through economic variables. Scholars highlight the contribution of social capital factors to the livelihoods of small-scale fishing communities and suggest that social aspects can be used as an alternative solution to reduce poverty. The concept of social capital has been extensively used to explain the relationship between social capital factors and wellbeing. The role of social capital in the well-being of small-scale fisher communities in Malaysia needs to be clarified. The current study investigates the contribution of various livelihood assets to the household income of small-scale fishers in Malaysia. Data for the survey were collected from 182 respondents from across multiple fishing villages on Langkawi Island, off the west coast of Peninsular Malaysia, using a structured questionnaire. The partial least square (PLS) technique was applied for statistical analysis. The study’s empirical findings depict that social capital, trust, job experience, and financial capital are important factors contributing to fishers' household income. The results show that the contribution of social capital and trust factors are significant to household income, indicating that social factors are essential in improving the well-being of small-scale fisher households in Malaysia. Policy for livelihood improvement of small-scale fisheries in Malaysia needs to prioritise investments in financial, human, natural and physical capital assets.","PeriodicalId":37296,"journal":{"name":"Asian Fisheries Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44785472","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}
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