Aquaculture, Fish and Fisheries最新文献

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Comparison of Otolith and Pectoral Fin Spine Ages of Black Bullhead Ameiurus melas 黑头牛耳石与胸鳍脊柱年龄的比较
IF 1.1
Aquaculture, Fish and Fisheries Pub Date : 2025-02-21 DOI: 10.1002/aff2.70047
Glenn T. Schumacher, Logan W. Sikora, Joshua K. Raabe, Justin A. VanDeHey, Greg G. Sass
{"title":"Comparison of Otolith and Pectoral Fin Spine Ages of Black Bullhead Ameiurus melas","authors":"Glenn T. Schumacher,&nbsp;Logan W. Sikora,&nbsp;Joshua K. Raabe,&nbsp;Justin A. VanDeHey,&nbsp;Greg G. Sass","doi":"10.1002/aff2.70047","DOIUrl":"https://doi.org/10.1002/aff2.70047","url":null,"abstract":"<p>Black bullhead <i>Ameiurus melas</i> are an environmentally tolerant fish that are often the target of population-level management efforts due to overabundance and potential negative influences on sport fishes. Descriptions of black bullhead growth and life history have been limited in part due to challenges in age estimation. Pectoral fin spines have been validated as age estimation structures for other ictalurids, but not black bullhead. We evaluated the precision of black bullhead pectoral fin spine and whole otolith age estimates from a northern Wisconsin lake. Age bias of pectoral fin spines was evaluated relative to whole otoliths using age estimates from two readers. Age estimates from both structures were applied to produce von Bertalanffy growth models. Precision of both structures was similar for both readers (66% and 58% agreement, 89% and 87% within 1 year). Pectoral fin spine age estimates showed higher between-reader agreement (59%, 95% within 1 year, CV = 9.2) than whole otolith age estimates (45%, 91% within 1 year, CV = 15.1). Pectoral fin spines may underestimate age relative to whole otoliths, particularly in older fish. von Bertalanffy growth model parameters were similar using both structures. Our findings suggest pectoral fin spine and whole otolith age estimates provide utility for age estimation in black bullhead, but modified methods of otolith processing and known age fish are needed to evaluate the accuracy of each structure.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70047","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143466180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Aligning Fishing Gear Selectivity With Harvest Slot Limits for Ballan Wrasse Labrus bergylta 使捕鱼工具的选择性与巴兰梭鱼的捕捞时段限制相一致 Labrus bergylta
IF 1.1
Aquaculture, Fish and Fisheries Pub Date : 2025-02-21 DOI: 10.1002/aff2.70044
Calum J. Pritchard, Marthe M. R. Stendal, Kim T. Halvorsen, Lauren Stewart, Nabeil K. G. Salama, Iain Berrill, Samuel A. M. Martin, C. Tara Marshall
{"title":"Aligning Fishing Gear Selectivity With Harvest Slot Limits for Ballan Wrasse Labrus bergylta","authors":"Calum J. Pritchard,&nbsp;Marthe M. R. Stendal,&nbsp;Kim T. Halvorsen,&nbsp;Lauren Stewart,&nbsp;Nabeil K. G. Salama,&nbsp;Iain Berrill,&nbsp;Samuel A. M. Martin,&nbsp;C. Tara Marshall","doi":"10.1002/aff2.70044","DOIUrl":"https://doi.org/10.1002/aff2.70044","url":null,"abstract":"<p>Selectivity is an important parameter used to identify the portion of a stock caught by a fishing gear. In principle, fisheries management aligns the length at which 50% of individuals are selected for (<span></span><math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>L</mi>\u0000 <mn>50</mn>\u0000 </msub>\u0000 <annotation>${L_{50}}$</annotation>\u0000 </semantics></math>) with minimum landing sizes. Harvest slot limits (the implementation of minimum landing sizes alongside maximum landing sizes) are in place for ballan wrasse, a sequential hermaphrodite commercially exploited in northern Europe. The selectivity of fishing gears used has yet to be investigated for this fishery. Two fishing gears were dismantled into their selective apertures, and fall-through experiments were used to determine the selectivity of each aperture, alternative escape panels and alternative entrances. Binomial logistic models were fit to estimate the relationships between selectivity, fish length and condition factor for each aperture. Linear models were used to investigate the relationships between <span></span><math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>L</mi>\u0000 <mn>50</mn>\u0000 </msub>\u0000 <annotation>${L_{50}}$</annotation>\u0000 </semantics></math>, escape panel width and entrance diameter. Both commercial fishing gears retained fish both smaller and larger than the size-based harvest slot limits. Empirical relationships were developed to estimate escape panel widths and entrance diameters to align the <span></span><math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>L</mi>\u0000 <mn>50</mn>\u0000 </msub>\u0000 <annotation>${L_{50}}$</annotation>\u0000 </semantics></math> with harvest slot limits. Fisheries managers may use these relationships to propose modifications to fishing gear that align their selectivity with harvest slot limits. However, it should be considered that these relationships were based on morphology and do not account for behaviour within the estimation of selectivity.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70044","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Assessment of Soft-Shell Mud Crab (Scylla olivacea) Farming Trend in the Southwest Coastal Region of Bangladesh 孟加拉国西南沿海地区软壳泥蟹养殖趋势评价
IF 1.1
Aquaculture, Fish and Fisheries Pub Date : 2025-02-20 DOI: 10.1002/aff2.70045
Md. Masudul Haque, Anirban Sarker, Shilpi Saha, Akond Mohammad Rafiqul Islam, Shaikh Nazrul Islam, Mohammad Abdul Baki
{"title":"Assessment of Soft-Shell Mud Crab (Scylla olivacea) Farming Trend in the Southwest Coastal Region of Bangladesh","authors":"Md. Masudul Haque,&nbsp;Anirban Sarker,&nbsp;Shilpi Saha,&nbsp;Akond Mohammad Rafiqul Islam,&nbsp;Shaikh Nazrul Islam,&nbsp;Mohammad Abdul Baki","doi":"10.1002/aff2.70045","DOIUrl":"https://doi.org/10.1002/aff2.70045","url":null,"abstract":"<p>Soft-shell crab aquaculture practices emerged as a profitable livelihood option in the study area due to its lower vulnerability to changing climatic conditions and high demand in the international market. Therefore, this study aims to identify the current growth of soft-shell mud crab farming to develop strategies to cope with future challenges. Random sampling was applied to collect primary empirical data from different stakeholders of the crab sub-sector based on structured and semi-structured questionnaires. In addition, focus group discussions (FGDs) and key informant interviews (KII) were arranged to collect information from a wide range of expert people to cross-validate the obtained information during the interviews. The study results indicated that the southwest region of Bangladesh has more than 380 farms having 5.55 ± 0.42 million seed crabs in demand in each cycle which is entirely dependent on wild stock. However, the wild crab harvesting amount has declined from 10.35 ± 2.07 to 4.38 ± 0.83 kg/day/person which represented a highly positive relationship with the active percentage of plastic cages that reduced from 99.43 ± 2.12% to 67.04 ± 4.75% during the investigated years. Farm mortality of stocking crabs has also increased by more than 8% in the last 9 years due to a lack of quality seed crabs. The soft-shell crab farmers preferred small stocking sizes to get quick moulting, ranging from 30.35 ± 2.59 to 43.50 ± 3.59 g. Most of the crab farmers used only tilapia fish as feed items leading to the increase in unit price from BDT 30.30 ± 1.98 to BDT 80.00 ± 2.46. The feeding demand and cost also increased many folds over the years with an increase in farm numbers and feed prices. So, crab hatchery development and formulated feed supply are inevitable for the sustainable growth of this sector.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70045","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Designing Digital Tools in Fisheries: What Fisherfolks Want in Malawi 在渔业中设计数字工具:马拉维渔民想要什么
IF 1.1
Aquaculture, Fish and Fisheries Pub Date : 2025-02-06 DOI: 10.1002/aff2.70043
Patrick Kawaye Chimseu, Samson Pilanazo Katengeza, Emmanuel Kaunda, Joseph Dzanja, Abigail Bennett
{"title":"Designing Digital Tools in Fisheries: What Fisherfolks Want in Malawi","authors":"Patrick Kawaye Chimseu,&nbsp;Samson Pilanazo Katengeza,&nbsp;Emmanuel Kaunda,&nbsp;Joseph Dzanja,&nbsp;Abigail Bennett","doi":"10.1002/aff2.70043","DOIUrl":"https://doi.org/10.1002/aff2.70043","url":null,"abstract":"<p>Use of digital tools is rapidly transforming the world, and Information and Communications Technology (ICT) integration in fisheries presents great opportunities for enhancing fishing-dependent livelihoods. This article employed latent class analysis and a multinomial logistic regression to explore preferred digital tools for fish traders to address the problem of lack of access to market information. Results from a sample of 548 participants show heterogeneous preferences among fish traders who can be classified into three subgroups: digital-wise (70%), phone-wise (24%) and digital-local (6%) across different platforms and prefer the use of all platforms (USSD, calls, apps, radio and television [TV] programmes). On the basis of platform ranking, traders prefer calls more, followed by app, USSD, radio and TV, respectively. Results further show that social demographic characteristics, including marital status, gender, age and trust among players, influence class membership in different subgroups. To address the diverse needs of traders, there is a need for a free, cross-platform digital system, call centre/USSD service for convenience, data quality checks, endorsements, the provision of digital credit and stakeholder collaboration to exploit digital fish trade opportunities for Malawi to benefit from the African Continental Free Trade Agreement and not to be left behind in the fourth industrial revolution.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70043","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143248849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Assessment of Food Sources for Juvenile and Adult Penaeus monodon in Tanzania Coastal Waters 坦桑尼亚沿海水域单斑对虾幼鱼和成鱼的食物来源评价
IF 1.1
Aquaculture, Fish and Fisheries Pub Date : 2025-02-02 DOI: 10.1002/aff2.70041
Ambakisye P. Simtoe, Blandina R. Lugendo, Yunus D. Mgaya
{"title":"Assessment of Food Sources for Juvenile and Adult Penaeus monodon in Tanzania Coastal Waters","authors":"Ambakisye P. Simtoe,&nbsp;Blandina R. Lugendo,&nbsp;Yunus D. Mgaya","doi":"10.1002/aff2.70041","DOIUrl":"https://doi.org/10.1002/aff2.70041","url":null,"abstract":"<p>To investigate the food sources for juvenile and adult <i>Penaeus monodon</i> and reconstruct its diet, samples of potential food sources were collected from the nursery areas of Kondo, Mbegani and Kitame, as well as from the fishing grounds of Mwambakuni and Saadani, located in the Bagamoyo coastal waters of Tanzania in the Western Indian Ocean. The carbon and nitrogen isotopic ratios of both <i>P. monodon</i> muscle tissues and their respective potential food sources were determined from samples collected during the Northeast Monsoon (NEM, September–October) and Southeast Monsoon (SEM, April–May), representing the dry and wet seasons, respectively. <i>P. monodon</i> muscles exhibited a wide range of δ<sup>13</sup>C values from −20.87‰ to −12.22‰ (average of −16.23‰, <i>n</i> = 6) during NEM, alongside a narrower range of δ<sup>15</sup>N values from 5.32‰ to 8.86‰ (average of 6.63, <i>n</i> = 6). Similarly, during SEM, δ<sup>13</sup>C values ranged from −20.68‰ to −15.59‰ (average of −17.47‰, <i>n</i> = 6), while δ<sup>15</sup>N values ranged from 5.32‰ to 8.55‰ (average of 7.05‰, <i>n</i> = 6). Different size classes displayed distinct δ<sup>13</sup>C with a range of −8.27‰ but were closely related in δ<sup>15</sup>N, exhibiting an average range of only 2.66‰. The contributions of carbon and nitrogen from mangrove and terrestrial sources were found to be negligible as food sources for <i>P. monodon</i> across both seasons. However, both juvenile and adult <i>P. monodon</i> significantly relied on seagrass ecosystems for their food, with minimal connectivity (<i>p </i>˂ 0.05) between the nursery and fishing grounds. Furthermore, it was observed that the primary carbon sources for <i>P. monodon</i> included shellfish (prawns), sergestid shrimps, plankton and algae during the SEM, with a slight shift towards algae and polychaetes during the NEM. Notably, <i>P. monodon</i> specialized in a specific food source during NEM, with juveniles showing significantly higher levels of cannibalism compared to adults.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70041","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143110927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Parasites of Farmed and Wild Tilapine Fishes From Selected Farms and Lake Jipe in Taita Taveta County, Kenya 肯尼亚泰塔塔维塔县选定养殖场和吉普湖养殖和野生罗非鱼的寄生虫
IF 1.1
Aquaculture, Fish and Fisheries Pub Date : 2025-02-02 DOI: 10.1002/aff2.70042
Finnan O. Ageng'o, Robert M. Waruiru, Daniel W. Wanja, Philip N. Nyaga, Mercy M. Hamisi, Joseph M. Ndegwa, Shimaa E. Ali, Mohan V. Chadag, Paul G. Mbuthia
{"title":"Parasites of Farmed and Wild Tilapine Fishes From Selected Farms and Lake Jipe in Taita Taveta County, Kenya","authors":"Finnan O. Ageng'o,&nbsp;Robert M. Waruiru,&nbsp;Daniel W. Wanja,&nbsp;Philip N. Nyaga,&nbsp;Mercy M. Hamisi,&nbsp;Joseph M. Ndegwa,&nbsp;Shimaa E. Ali,&nbsp;Mohan V. Chadag,&nbsp;Paul G. Mbuthia","doi":"10.1002/aff2.70042","DOIUrl":"https://doi.org/10.1002/aff2.70042","url":null,"abstract":"<p>Parasitic infections threaten the endangered <i>Oreochromis jipe</i> and other ichthyic populations in Lake Jipe, thereby hindering conservation efforts. Initiatives have been made to farm <i>O. jipe</i> as a conservation strategy. To develop effective conservation approaches and ensure the species' survival in its natural habitat and aquaculture systems, it is imperative to understand the diverse parasites in these habitats. Consequently, this cross-sectional study was conducted to determine parasitic loads in tilapias from selected farms and Lake Jipe. A total of 111 fishes were collected (76 farmed, 35 from the lake), comprising 66 <i>O. jipe</i>, 34 <i>Oreochromis niloticus</i> and 11 hybrids of <i>O. jipe</i> and <i>O. niloticus</i>. The fish were euthanized, necropsied and examined for parasitic infections via visual inspection and light microscopy. Out of 111 fishes examined, 58 (52.3%) were infected with 212 parasites, including 135 (63.7%) and 77 (36.3%) from farm and lake habitats, respectively. The prevalence of parasitic infections in fish from the lake and farm habitats was 68.6% and 44.7%, respectively. The most frequently occurring parasite genera identified were <i>Diplostomum</i> (30.63%), <i>Acanthocephalus</i> (20.7%), <i>Dactylogyrus</i> (9.9%) and <i>Contracaecum</i> (2.7%), with mean intensities of 2.9, 3.7, 1.9 and 1.7, respectively<i>. Contracaecum</i> and <i>Camallanus</i> were exclusively found in fish from Lake Jipe, while <i>Euclinostomum</i> and <i>Gyrodactylus</i> were only observed in farmed fish. <i>O. jipe</i> had the highest prevalence of parasitic infections (59.1%), followed by <i>O. niloticus</i> (44.1%) and hybrids (36.4%) (<i>p</i> &gt; 0.05). In conclusion, the examined fishes were infected with diverse parasites, which have both public health concerns (<i>Euclinostomum</i> and <i>Acanthocephalus</i>) and economic significance (<i>Dactylogyrus</i> and <i>Gyrodactylus</i>). Consequently, it is imperative to enhance public awareness and enforce biosecurity measures to mitigate potential health risks and to improve the productivity of the pond culture system and lake ecosystem. These measures will help reduce parasite dissemination and promote sustainable fish production and populations.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70042","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143110928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Length-Based Stock Assessment of the Mackerel Scad, Decapterus macarellus (Cuvier, 1833) From the Tanzanian Coastal Waters 坦桑尼亚沿海水域鲭鱼科,Decapterus macarellus(居维叶,1833年)基于长度的种群评估
IF 1.1
Aquaculture, Fish and Fisheries Pub Date : 2025-01-29 DOI: 10.1002/aff2.70039
Joseph Salawa Sululu, Blandina Robert Lugendo, Paul Tuda, Benaiah Lameck Benno
{"title":"Length-Based Stock Assessment of the Mackerel Scad, Decapterus macarellus (Cuvier, 1833) From the Tanzanian Coastal Waters","authors":"Joseph Salawa Sululu,&nbsp;Blandina Robert Lugendo,&nbsp;Paul Tuda,&nbsp;Benaiah Lameck Benno","doi":"10.1002/aff2.70039","DOIUrl":"https://doi.org/10.1002/aff2.70039","url":null,"abstract":"<p>This study aimed to conduct a stock assessment of <i>Decapterus macarellus</i> from Tanzanian coastal waters to determine its current stock status and provide appropriate management recommendations. We used a suite of length-based methods, including the Electronic Length Frequency Analysis (ELEFAN) programme to estimate growth parameters and catch curves to evaluate exploitation fishing and mortality parameters; Length-Based Spawning Potential Ratio (LBSPR) to calculate the spawning potential ratio (SPR), length-based indicators (LBI) to assess sustainable fishing levels and length-based reference point (LBRP) to determine the target reference point (RP) for stock spawning biomass (SB). The results indicated that this small pelagic species grows fast, with a growth rate (<i>K</i>) of 0.74 year<sup>−1</sup> and a growth performance index (Ф′) of 2.88. However, the stock is currently at risk of overfishing due to high fishing pressure (<i>F</i>/<i>M</i> &gt; 1) and an elevated exploitation rate (<i>E</i> = 0.71), which resulted in a very low SPR (SPR = 0.11) and SB below the target RP. Yield-per-recruit analysis revealed that the current fishing effort (<i>F</i><sub>curr</sub> = 2.57) far exceeded the precautionary limit (<i>F</i><sub>0.1</sub>) and surpassed the fishing mortality rate that maximizes yield per recruit (<i>F</i><sub>max</sub> = 1.73). This excessive effort largely impacted mega-spawners, reducing their proportion in the catch to a critically low percentage (9%). On the basis of these findings, the study recommends reducing the current fishing effort to <i>F</i><sub>0.1</sub> (0.84) by limiting the number of ring nets, implementing seasonal closures during peak spawning periods and operating in deeper waters (40–200 m) to protect juveniles and minimize mega-spawner capture.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70039","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143120593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Otolith Increments and Elements: Assessing a Recently Discovered Population of Weather Loach 耳石增量和元素:评估最近发现的天气泥鳅种群
IF 1.1
Aquaculture, Fish and Fisheries Pub Date : 2025-01-27 DOI: 10.1002/aff2.70037
Brendan R. Amman, Wesley L. Gerrin, Sarah F. McNair, Peter D. Hazelton, James L. Shelton, Brian M. Shamblin, Martin J. Hamel
{"title":"Otolith Increments and Elements: Assessing a Recently Discovered Population of Weather Loach","authors":"Brendan R. Amman,&nbsp;Wesley L. Gerrin,&nbsp;Sarah F. McNair,&nbsp;Peter D. Hazelton,&nbsp;James L. Shelton,&nbsp;Brian M. Shamblin,&nbsp;Martin J. Hamel","doi":"10.1002/aff2.70037","DOIUrl":"https://doi.org/10.1002/aff2.70037","url":null,"abstract":"<p>The introduction of aquatic non-native species into novel systems may have negative impacts on native biodiversity. Introduced species can predate native species, compete for resources, transmit diseases, hybridise and degrade habitat. To minimise impacts on aquatic biota, management efforts are needed to reduce invasive species abundance. However, eradication or reduction efforts require information about the source of introductions and the biology and ecology of the organism. Therefore, the objective of this study was to quantify population dynamics, natal origins and dispersal characteristics of the introduced Weather Loach <i>Misgurnus anguillicaudatus</i>, which was recently discovered in Georgia, USA waters. Sagittal otoliths were extracted and aged to determine dynamic rate functions, and we performed microchemical analysis on a subset of otoliths to quantify dispersal and introduction events. Sampled Weather Loach consisted of a wide range of ages and lengths, indicating that natural reproduction and recruitment have been occurring for multiple years. The change in otolith microchemistry seen in some fish reveals that they have dispersed from their introduction or reproduction sites into different areas, while others have likely remained in the same system since hatching. Overall, our findings indicate that the Weather Loach populations in Georgia are disjunct, likely stemming from multiple introductions. These results will be used to develop management strategies as well as aid in the effort to continue and enhance outreach regarding the release of unwanted aquarium fish.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70037","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143119965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Current Status of Hilsa (Tenualosa ilisha) Fisheries in Bangladesh and Implications for Future Research and Development 孟加拉国Hilsa (Tenualosa ilisha)渔业的现状及其对未来研究和发展的影响
IF 1.1
Aquaculture, Fish and Fisheries Pub Date : 2025-01-27 DOI: 10.1002/aff2.70040
Md. Mehedi Alam, Mohammad Mahfujul Haque, Morena Santi, Md. Asadur Rahman, Neaz A. Hasan, Balaram Mahalder
{"title":"Current Status of Hilsa (Tenualosa ilisha) Fisheries in Bangladesh and Implications for Future Research and Development","authors":"Md. Mehedi Alam,&nbsp;Mohammad Mahfujul Haque,&nbsp;Morena Santi,&nbsp;Md. Asadur Rahman,&nbsp;Neaz A. Hasan,&nbsp;Balaram Mahalder","doi":"10.1002/aff2.70040","DOIUrl":"https://doi.org/10.1002/aff2.70040","url":null,"abstract":"<p>Hilsa shad (<i>Tenualosa ilisha</i>) is an anadromous fish, making the single largest wild fishery in Bangladesh, supporting the livelihoods of about 2% of the population and contributing 1% to the national GDP. Several studies reported positive outcomes associated with its catch status, biology, ecology, nutritional profile, conservation and management and socio-economic impacts. However, significant knowledge gaps exist in hilsa fisheries, particularly in the areas crucial for research and development. In this article, we conducted a systematic review of literature to identify and address the knowledge gaps, challenges and research priorities in hilsa fisheries to ensure their sustainable management and production. Recent data from the Department of Fisheries (DoF) indicate rising production of hilsa in Bangladesh, sparking debate about its accuracy. Reliable data are essential to avoid miscalculations that could lead to risk of overfishing or underfishing of this important fish. Hilsa matures at 6–12 months, lives 2–6 years, feeds primarily on phytoplankton and spawns mostly during full moon of September and October. The abundance of brood hilsa in the river systems before and after the peak breeding season suggests further research is needed to refine breeding period for sustainable production. Although recent molecular studies have mapped the complete genome of hilsa, there remains a lack of comprehensive knowledge on its biology, ecology, conservation and life cycle—the key areas for sustainable catches and domestication. Enhancing global demand for this species requires value addition, such as removing sharp pin bones in the flesh. DoF has implemented various policies and projects, including establishment of sanctuaries to protect and conserve hilsa fisheries for sustainable exploitation. However, these measures have sparked controversy due to their adverse impacts on income and livelihoods of fishermen. Addressing these challenges and knowledge gaps requires focused research and development initiatives to ensure sustainable hilsa fisheries in Bangladesh.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70040","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143119966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Impact of Socio-Demographic Factors and Handling Practices on Post-Harvest Fish Losses in Kakamega County's Cultured Tilapia Value Chain 社会人口因素和处理做法对Kakamega县养殖罗非鱼价值链收获后鱼类损失的影响
IF 1.1
Aquaculture, Fish and Fisheries Pub Date : 2025-01-19 DOI: 10.1002/aff2.70034
James Adero Obar, Joseph Wafula Matofari, John Masani Nduko
{"title":"Impact of Socio-Demographic Factors and Handling Practices on Post-Harvest Fish Losses in Kakamega County's Cultured Tilapia Value Chain","authors":"James Adero Obar,&nbsp;Joseph Wafula Matofari,&nbsp;John Masani Nduko","doi":"10.1002/aff2.70034","DOIUrl":"https://doi.org/10.1002/aff2.70034","url":null,"abstract":"<p>Post-harvest fish losses (PHFL) significantly impact the aquaculture sector in Kenya, undermining food security and economic growth. This study investigated socio-demographic factors and handling practices influencing PHFL in Kakamega County's cultured tilapia value chain. Data were collected from 94 value chain actors operating across multiple nodes, including farming, processing and retail stages from six sub-counties using surveys and observations. Results revealed that 64% of participants were female, and 40.3% had completed high school, with only 26.6% holding valid food handler certificates. Household sizes mostly ranged from 4 to 9 members, and experience in the value chain varied, with 33% having 5–10 years of experience and 17% had over 21 years of experience. PHFL were significant across nodes, with farm gate losses highest in Butere (32%) and lowest in Likuyani (8.42%). Wholesale and retail losses were also notable, with Mumias East showing the highest overall losses. Regression analysis identified key predictors of PHFL, including poor sanitary conditions, lack of training, inadequate water quality and cooling practices, explaining 87.2% of the variance in PHFL. Experience negatively correlated with PHFL (<i>r</i> = −0.354, <i>p</i> &lt; 0.01), indicating that more experienced individuals incurred lower losses. Chi-square tests showed significant associations between PHFL and factors like household size, occupation, training and sanitation but not gender, education or age. The findings highlight the need for targeted interventions, including training programmes, infrastructure improvements and adherence to food safety standards, to minimise PHFL, improve fish quality and enhance food and nutrition security in Kakamega County.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70034","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143117164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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