Aquaculture, Fish and Fisheries最新文献

{"title":"Cage-Cultured Nile Tilapia (Oreochromis niloticus) Farming: A Third Generation of Pollution in Lake Victoria, Tanzania","authors":"Richard S. Komba,&nbsp;Chacha J. Mwita,&nbsp;Esther G. Kimaro","doi":"10.1002/aff2.70108","DOIUrl":"https://doi.org/10.1002/aff2.70108","url":null,"abstract":"<p>This study was carried out along the Mwanza Gulf, Lake Victoria, Tanzania, where water samples for the determination of physico-chemical parameters were collected from March to October 2023. NH⁴⁺-N, NO³⁻-N, NO²⁻-N, and PO⁴⁺-P were analyzed using standard methods. Temperature (°C), electrical conductivity (µS/cm), dissolved oxygen (mg/L), pH, and turbidity were measured in situ. Water temperature ranged from 27.9°C at Misungwi to 29.1°C at Nyamagana. Dissolved oxygen (DO) was high at Ilemela (6.70 mg/L) and declined (5.78 mg/L) at Nyamagana. Electrical conductivity and water turbidity increased as the number of cages sampled increased. Nitrate increased from 0.09 mg/L (90 µg/L) at Ilemela to 0.15 mg/L (150 µg/L) at Nyamagana, ammonia concentration from 0.26 mg/L (260 µg/L) to 0.45 mg/L (450 µg/L) at Nyamagana, and phosphate increased from 0.26 mg/L (260 µg/L) to 1.41 mg/L (1410 µg/L). When the results of this study were compared to those reported before 2015, the variations were significant at all levels. We conclude that inputs from cage fish farming are contributing immensely to nutrients loading and thus pollution in the lake. The riparian governments around the lake are urged to take measures that will ensure sustainable cage fish farming without jeopardizing the environmental quality of Lake Victoria with the consequential collapse of the existing fishery.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70108","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144773695","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}

{"title":"Hatchery Salmon and Ecological Overshoot","authors":"Benjamin William Van Alen","doi":"10.1002/aff2.70103","DOIUrl":"https://doi.org/10.1002/aff2.70103","url":null,"abstract":"<p>Is there an ecological niche for ‘ocean ranched’ hatchery salmon, <i>Oncorhynchus</i> spp., to supplement wild salmon? Ecologically, I hypothesize that the carrying capacity for biota is: (1) limited; (2) filled with locally adapted biota competing and cooperating to nurture viable offspring; and (3) sustained by the biogeochemical recycling of their nutrient elements. Thus, biotic abundance is limited more by the space and food needed to nurture viable adults than by the numbers reproduced. Hatchery immigrants compete for space and food with wild biota, spawn with and reduce the fitness and biodiversity of wild salmon, and their growth and commercial harvest consume more biogeochemical resources than they recycle. This contributes directly to ecological overshoot and to the declining or depressed populations of wild salmon, Pacific herring <i>Clupea pallasi</i> and eulachon <i>Thaleichthys pacificus</i> now observed in Southeast Alaska and wherever there are production releases of hatchery salmon. Industrial-scale hatcheries do not have a niche in sustainable salmon management.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 4","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70103","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144705591","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}

{"title":"Sinoatrial Contracaeciasis in Johnny Darters (Etheostoma nigrum) and Plains Topminnow (Fundulus sciadicus) From the South Platte Drainage, Colorado","authors":"Paula Andrea Schaffer,&nbsp;Ashley K. McGrew,&nbsp;Jessica Henley,&nbsp;Catherine M. Adams,&nbsp;Dana L. Winkelman,&nbsp;Ryan M. Fitzpatrick,&nbsp;Pete Cadmus","doi":"10.1002/aff2.70100","DOIUrl":"https://doi.org/10.1002/aff2.70100","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <p>Intra-sinoatrial nematodes were incidentally recognized in wild-caught Colorado Johnny Darters (<i>Etheostoma nigrum</i>, JD) in 2020–2021 and in Colorado Plains Topminnow (<i>Fundulus sciadicus</i>, PTM) in 2023-2024. PTM and JD were evaluated histologically. Nematodes dissected from PTM were used for morphologic evaluation and molecular identification. The first and second internal transcribed spacers (ITS1 and ITS2) of ribosomal DNA were sequenced. Sinoatrial nematodes were found in two of 1232 JD (0.2%) and nine of 110 PTM (8.2%). Worms caused dilation or aneurysm of the sinus venosus. One JD had severe sinus venosus phlebitis. Morphologic, histologic and molecular features were diagnostic for <i>Contracaecum</i> spp. This is the first identification of larval <i>Contracaecum</i> in PTM, the first record of an intravascular nematode in this species, and the first documentation of vascular localization of <i>Contracaecum</i> larvae in JD. Vascular pathology could result in increased susceptibility to predation and favour the completion of the nematode life cycle. Parasites could become detrimental to population survival, especially those that are stressed by ecological and anthropogenic factors.</p>\u0000 </section>\u0000 </div>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 4","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70100","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144687847","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}

{"title":"Feeding Mystus gulio Fry With Different Dietary Inclusion of Coccomyxa Sp.: Changes in Nutritional Profile, Pigments and Digestive Enzyme Activities","authors":"Subeda Newase,&nbsp;Mohammad Ekramul Haque,&nbsp;Mahima Ranjan Acharjee,&nbsp;Trina Das,&nbsp;Sifatun Nur,&nbsp;Sadia Afrin,&nbsp;Zannatul Nayma,&nbsp;S. K. M. Azizul Islam,&nbsp;Helena Khatoon","doi":"10.1002/aff2.70102","DOIUrl":"https://doi.org/10.1002/aff2.70102","url":null,"abstract":"<p>The aim of this study was to investigate the effects of <i>Coccomyxa</i> sp. on the survival, nutritional profile, pigments and digestive enzyme activities of <i>Mystus gulio</i>. A 75-day feeding trial was performed during which the fish fry were fed with microalgae as a partial replacement for other nutritional components. The fry were fed five different diets: a commercial feed, a control diet without <i>Coccomyxa</i> sp. and three experimental diets incorporating <i>Coccomyxa</i> sp. at varying rates of T1 (5% inclusion), T2 (10% inclusion) and T3 (15% inclusion). Fry (35 per tank) were cultured in triplicate 35 L glass tanks and fed twice a day at 5% of their body weight. The findings showed that among the treatment groups, T3 had the highest survival rate (81% ± 4.36%), followed by T1, T2, control and commercial. Furthermore, T3 had the highest quantities of protein (43.8% ± 6.55% dry weight) and lipids (25.9% ± 0.68% dry weight), whereas T2 had higher amounts of carbohydrate (14.9% ± 1.99% dry weight). Meanwhile, the polyunsaturated fatty acid (PUFA) content varied significantly (<i>p</i> &lt; 0.05) among the treatments, whereas T3 was the highest (41.75 ± 0.12 ppm). Additionally, it was also found that the T3 group exhibited higher carotenoid and astaxanthin content in the fish body. Moreover, the T2 diet resulted in higher levels of amylase (13.7 ± 0.16 U/g) compared to the other diets. Conversely, protease (12.6 ± 0.15 U/g) and lipase (2.20 ± 0.13 U/g) activity were found greater in T3 treatment. These results suggest that microalgae can be used as a viable and alternative feed ingredient in aquaculture diets.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 4","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70102","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144681118","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}

{"title":"Unbundling Fish Kills Associated Losses and Compliance Aspects in Lacustrine Cage Aquaculture Farms","authors":"Christopher Mulanda Aura,&nbsp;Hezron Awandu,&nbsp;Venny Mziri,&nbsp;Fonda Jane Awuor,&nbsp;Chrispine S. Nyamweya,&nbsp;Safina Musa,&nbsp;Melckzedeck Osore","doi":"10.1002/aff2.70101","DOIUrl":"https://doi.org/10.1002/aff2.70101","url":null,"abstract":"<p>Cage fish farming has emerged as a key component of aquaculture in Lake Victoria, Kenya, providing critical contributions to food security, employment and local livelihoods. Despite its growth, the sector faces recurring challenges—including inadequate regulatory compliance, poor environmental management and frequent mass fish kills that threaten its long-term sustainability. Notably, there is a lack of empirical data and structured analyses on the economic consequences of these fish kills and the extent of non-compliance with statutory regulations. The mass fish kills that occurred in November 2022 in Kisumu and Homa Bay counties highlighted these systemic vulnerabilities, resulting in significant financial losses and ecological disruptions. This study addresses this critical gap by assessing the socio-economic impacts and governance shortcomings associated with fish kills in Lake Victoria's cage aquaculture. Specifically, the study quantifies economic losses, evaluates regulatory compliance among affected farms and proposes actionable recommendations to enhance sustainability and resilience in the sector. A mixed-methods approach was employed, involving surveys, stakeholder interviews and field observations across 10 affected beaches. The study found that fish kills led to total economic losses of $7.7 million, with Kisumu County incurring 95.35% of the losses. High-density cage farms, particularly at Ogal, experienced severe losses due to overcrowding, degraded water quality and nutrient accumulation. Harmful algal blooms exacerbated these conditions, leading to widespread fish mortality. Male-owned farms bore the largest financial burden, reflecting their dominance in the sector. The lack of compliance with statutory licensing requirements further amplified vulnerabilities. Inadequate governance, poor environmental management and limited farmer training are critical threats to cage aquaculture sustainability. Therefore, strengthening regulatory frameworks, promoting environmental monitoring and enhancing farmer capacity through training are recommended. Additionally, integrating Beach Management Units (BMUs) into formal governance frameworks and supporting cooperative farming models could enhance fish health resilience.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 4","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70101","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144681116","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}

{"title":"Determinants of Choice of Climate Smart Aquaculture Practices: Insights From Smallholder Fish Farmers in Kakamega County, Kenya","authors":"Boke Christopher Magesi,&nbsp;Augustus Sammy Muluvi,&nbsp;Hillary Kiplangat Bett","doi":"10.1002/aff2.70096","DOIUrl":"https://doi.org/10.1002/aff2.70096","url":null,"abstract":"<p>The impact of climate change on aquaculture threatens global food security, disrupting fish productivity and sector sustainability. Climate-smart aquaculture (CSAq) offers a viable strategy to mitigate these challenges, particularly during droughts, through practices such as adjusted fish stocking, dam lining, tanks, boreholes and pond covers. Despite their benefits, adoption among smallholder fish farmers in Kakamega County remains low. This study examines factors influencing CSAq adoption among 220 smallholder fish farmers, selected through a multistage sampling technique. A multivariate probit model was employed to analyse the data. Results indicate that farming experience, gender, education level, age, land ownership, household size, extension service frequency and access to CSAq training significantly influence the adoption of these practices. Farmers with more experience, higher education and greater access to training and extension services were more likely to implement CSAq techniques. The findings highlight the need for targeted interventions to enhance CSAq adoption. Policies promoting knowledge dissemination, improved farmer training and increased access to extension services are crucial for strengthening climate resilience in aquaculture. Investment in these areas will encourage smallholder farmers to adopt CSAq practices, ensuring sustainable fish production and long-term sector stability amid climate change challenges.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 4","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70096","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144672890","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}

{"title":"Nile Tilapia (Oreochromis niloticus L.) Cage Aquaculture in Africa: Potential Threats to Congeneric Fish Species and Advances to Detect Escapes","authors":"Gerald Kwikiriza,&nbsp;Mavindu Muthoka,&nbsp;Timothy Omara,&nbsp;Ivan Abaho,&nbsp;Papius Dias Tibihika,&nbsp;Manuel Curto,&nbsp;Mary A. Opiyo,&nbsp;Jonathan Munguti,&nbsp;Jacob Abwao,&nbsp;Paul Orina,&nbsp;Harald Meimberg","doi":"10.1002/aff2.70090","DOIUrl":"https://doi.org/10.1002/aff2.70090","url":null,"abstract":"<p>Cage fish farming, a recent development in aquaculture, has enhanced fisheries production due to its higher stocking densities than traditional pond and open-water systems. Although it can enhance production, the system can pose biodiversity threats when there is an unintentional or intentional release of stocked fish into the wild. In this review, we examine the expansion of Nile tilapia (<i>Oreochromis niloticus</i> L.) cage aquaculture in Africa and the potential threats that this may have on congeneric <i>Oreochromis</i> species. Threats such as interspecific competition, disease transmission and hybridisation, which are drivers of genetic diversity loss among native fish populations, have been reported. However, most studies have focused on investigating cage fish production, water quality and the associated economics, but research assessing the genetic and ecological impacts imposed by the escaped fish from cages on native species is still limited across African countries. While direct evidence of hybridisation due to cage fish farming is lacking, genetic mixing of Nile tilapia with native <i>Oreochromis</i> species has been reported in some African water bodies. Further, only Egypt, Kenya and Uganda have functional Fisheries and Aquaculture regulations for guiding the aquaculture activities. Thus, there is an urgent need to institute regulatory frameworks that not only provide clear guidelines on aquaculture production but also balance between environmental conservation and economic sustainability.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 4","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70090","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144624233","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}

{"title":"Seascapes of Economic Returns: Income Distribution and Inequality in Tanzania's Seafood Trade","authors":"Franco Mbegallo,&nbsp;Betty Waized,&nbsp;Zena Mpenda","doi":"10.1002/aff2.70093","DOIUrl":"https://doi.org/10.1002/aff2.70093","url":null,"abstract":"<p>Global trade in marine and aquaculture fishery products reached $186 billion by 2022, reflecting a 63% increase over the past decade and contributing to economic growth and supporting Sustainable Development Goals 1, 2 and 14. Tanzania's exports of processed small pelagic products surged to $3.9 million in 2023–2024, driven by rising demand in African markets, while exports of crustacean products to the global north reached $11.8 million. Despite the sector's contribution to economic growth and livelihoods, the influence of marine trade on microeconomic development and income distribution among actors remains underexplored. This study fills this gap by examining the distribution of trade benefits and associated inequality in Tanzania's seafood trade. The study was conducted at four landing sites in three coastal districts of Tanzania. The net income distribution approach, Lorenz concentration curve and Gini coefficient were used to analyse income distribution and inequality in seafood trade. Findings showed a significant gap in income and costs across actors in the small pelagic and crustacean value chains, with traders earning higher income than other actors. The Gini coefficients for the small pelagic and crustacean chains were 0.58 and 0.44, respectively, signifying greater income inequality among traders (aggregators and wholesalers), processors and fishers in both chains. The study recommends improving market infrastructure and institutionalising pre-trade agreements to ensure a fair distribution of benefits within the sector.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 4","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70093","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144598674","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}

{"title":"Preliminary Investigation Into the Appropriateness of Control Measures and Harvest Control Rules for a Data-Limited, Sex-Changing Fish Managed by Harvest Slot Limits","authors":"Calum J. Pritchard,&nbsp;Jim Treasurer,&nbsp;Ash Highway,&nbsp;Nabeil K. G. Salama,&nbsp;Iain Berrill,&nbsp;Samuel A. M. Martin,&nbsp;C. Tara Marshall","doi":"10.1002/aff2.70091","DOIUrl":"https://doi.org/10.1002/aff2.70091","url":null,"abstract":"&lt;p&gt;Fisheries assessments require valid life-history information to evaluate species’ abundance and reproductive potential. Assessing sequential hermaphrodites requires additional information to account for these species’ complex maturation schedules. For data-limited species, harvest control rules may be applied to inform management decisions on how much fishing should be permitted. Ballan wrasse (&lt;i&gt;Labrus bergylta&lt;/i&gt;) are data-limited sequential hermaphrodites used as cleaner fish throughout northern European salmonid aquaculture. In Scotland, harvest slot limits and a seasonal fishery closure were introduced to manage the fishery but the appropriateness of these measures has not been assessed. This fishery has never been formally assessed and management decisions are not currently informed by harvest control rules. This study analysed three years of fishery-dependent length-frequency data. Demographic data (sex, gonadosomatic indices &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;G&lt;/mi&gt;\u0000 &lt;mi&gt;S&lt;/mi&gt;\u0000 &lt;mi&gt;I&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$GSI$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, and age) were collected from 620 fish, and an age-length key was constructed. Ages were assigned to length data, the total mortality rate (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mi&gt;Z&lt;/mi&gt;\u0000 &lt;annotation&gt;$Z$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;) was estimated from a catch curve, and the ratio of fishing mortality (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mi&gt;F&lt;/mi&gt;\u0000 &lt;annotation&gt;$F$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;) to natural mortality (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mi&gt;M&lt;/mi&gt;\u0000 &lt;annotation&gt;$M$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;) was compared with proximate values for sustainable fishing practices. Landings data were obtained from the Scottish government and harvest control rules were applied. Around 4.4% of landings were outside of harvest slot limits. No males were identified. The maximum observed &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;G&lt;/mi&gt;\u0000 &lt;mi&gt;S&lt;/mi&gt;\u0000 &lt;mi&gt;I&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$GSI$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; was 1.54%, suggesting the fishing season does not coincide with the spawning period. &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mi&gt;F&lt;/mi&gt;\u0000 &lt;annotation&gt;$F$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; (0.58) accounted for 75% of &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mi&gt;Z&lt;/mi&gt;\u0000 &lt;annotation&gt;$Z$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; (0.77). There were fundamental incompatibilities between the assumptions of the","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 4","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70091","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144582347","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}

{"title":"Pathogens From Salmon Aquaculture in Relation to Conservation of Wild Pacific Salmon in Canada: An Alternative Perspective","authors":"Gary D. Marty,&nbsp;Jayde A. Ferguson,&nbsp;Theodore R. Meyers,&nbsp;Thomas B. Waltzek,&nbsp;Michael L. Kent,&nbsp;Esteban Soto","doi":"10.1002/aff2.70079","DOIUrl":"https://doi.org/10.1002/aff2.70079","url":null,"abstract":"<p>Several articles over the last two decades have provided data, analyses and interpretations that suggest there are significant impacts of pathogens transmitted from farmed salmon on wild Pacific salmon populations in British Columbia (BC), the westernmost province of Canada. Because disease is a normal part of all animal populations, there is always a potential for pathogen transfer between animal populations that interact. However, the evidence is weak that pathogens transmitted from farmed salmon cause significant impacts on wild salmon populations. We provide additional data and alternative interpretations of the available evidence to show that (i) many studies overestimate the risk of pathogens transmitted from farmed salmon to wild Pacific salmon, (ii) these risks have not manifested as having significant impacts on wild Pacific salmon populations, and, therefore, (iii) the evidence better supports the conclusion that pathogens transmitted from farmed salmon are having no more than minimal impact on wild Pacific salmon populations. On the basis of this information, we hypothesize that removing open net pen salmon farms will have no detectable effect on wild Pacific salmon population productivity in relation to reference populations.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"5 4","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70079","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144573474","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}