Aquaculture, Fish and Fisheries最新文献

{"title":"Comparative Performance of Kenyan and Imported Artemia in Early Larval Rearing of Clarias gariepinus","authors":"Morine M. Ngarari,&nbsp;Mary A. Opiyo,&nbsp;Hinzano S. Mdzomba,&nbsp;Miriam W. Wainaina,&nbsp;Anthony M. Nzioka,&nbsp;Betty M. Nyonje,&nbsp;James M. Mwaluma,&nbsp;Derrick G. Rugendo,&nbsp;Charles C. Ngugi,&nbsp;Charles W. Gatune","doi":"10.1002/aff2.70326","DOIUrl":"https://doi.org/10.1002/aff2.70326","url":null,"abstract":"<p>Successful larval rearing of fish depends largely on live feed availability, during the critical first-feeding stage. In Kenya, hatcheries commonly use phytoplankton or imported Artemia cysts as starter feeds, although locally produced Artemia is available. Hatchery operators' reports on low larval survival when using imported Artemia prompted this study to compare growth performance and survival of Clarias gariepinus larvae fed Kenyan-produced and imported Artemia. A 21-day feeding trial was conducted using 12 glass aquaria (60 cm × 30 cm × 30 cm), each containing 30 L of water. A total of 5400 larvae (mean initial weight 1.83 mg; mean initial length 6.09 mm) were stocked at 15 larvae L⁻¹. Three dietary treatments, each replicated four times were tested: Kenyan-produced Artemia (KMFRI strain), Great Salt Lake Artemia (GSL) and Shell-Free <i>Artemia</i> (SFA). Larvae were fed exclusively on Artemia from Day 3 to Day 8 post-hatch, co-fed with Artemia and dry starter feed from Day 9 to Day 11 and thereafter fed exclusively on dry starter feed until Day 21. No significant differences (<i>p &gt; </i>0.05) were observed in mean total length among treatments throughout the trial. Body weight differed significantly (<i>p</i> &lt; 0.05) on Day 7 with SFA-fed larvae showing superior growth. Survival was also significantly higher (<i>p</i> &lt; 0.05 in SFA-fed larvae compared to encapsulated treatments. Although the KMFRI strain contained lower crude protein content, it supported larval growth comparable to imported GSL. These findings suggest that seven days of live feeding are sufficient for efficient larval rearing of C. gariepinus. There is also an indication that the KMFRI strain has a potential as a locally available live feed to be used in African catfish hatcheries. However, studies on nutritional quality and comprehensive economic evaluation should be undertaken before its commercial adoption.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"6 5","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70326","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148943229","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":"Bacterial Diseases in Farmed Nile Tilapia (Oreochromis niloticus): A Review of Pathogenesis, Immune Responses and Recent Advances in Diagnostics and Management","authors":"Catherine Agoe,&nbsp;John Walakira,&nbsp;Gerald Kwikiriza,&nbsp;Nasser Kasozi,&nbsp;Ivan Abaho,&nbsp;Manuel Curto,&nbsp;Paul Meulenbroek,&nbsp;Harald Meimberg,&nbsp;Peter Akoll","doi":"10.1002/aff2.70319","DOIUrl":"https://doi.org/10.1002/aff2.70319","url":null,"abstract":"<p>Nile tilapia (<i>Oreochromis niloticus</i>) is among the most widely farmed fish globally that plays a major role in ensuring food security in many low- and middle-income countries. This is attributed to its environmental tolerance, ease of breeding, rapid growth, efficient feed use and high consumer acceptance. As aquaculture production intensifies, bacterial diseases increasingly constrain yields and economic benefits. Although many studies document bacterial outbreaks and have evaluated interventions, heterogeneity across pathogens in virulence, geographic distribution, mortality patterns, environmental drivers and antimicrobial resistance (AMR), together with differences in study designs and outcome, limit a unified understanding of disease risk. Following Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, we systematically searched PubMed, Web of Science and Scopus; of 689 records identified, 615 remained after removing duplicates, and 399 full texts were assessed after removing 216 articles that were not clearly relevant to the review topic. Of 399 full-text articles assessed, 87 articles were excluded, yielding 312 studies that met inclusion criteria for qualitative synthesis. This review synthesizes evidence on major bacterial pathogens, epidemiological and environmental drivers, AMR, virulence mechanisms, host innate and adaptive responses, diagnostics and disease management strategies. <i>Streptococcus</i>, <i>Aeromonas</i>, <i>Francisella</i> and <i>Edwardsiella</i> emerged as major bacterial taxa of global importance, although emerging and opportunistic pathogens can also cause severe disease outbreaks under stressful conditions. Disease outcomes reflect interactions among pathogen virulence, host susceptibility, environmental stress, co-infections and husbandry practices. AMR is an additional One Health concern through resistance selection, horizontal gene transfer, mobile genetic elements and environmental dissemination into aquaculture systems. Sustainable disease management requires integrated, data-driven strategies that link pathogen surveillance, biosecurity, environmental stewardship and preventive disease management.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"6 5","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70319","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942730","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":"Correction to “Nutritional Composition of African Catfish (Clarias gariepinus) in Ghana: Effects of Culture Conditions, Feed and Processing”","authors":"","doi":"10.1002/aff2.70320","DOIUrl":"https://doi.org/10.1002/aff2.70320","url":null,"abstract":"<p>Atter, A., N. Taye, C. Osei Tutu, et al. 2026. “Nutritional Composition of African Catfish (<i>Clarias gariepinus</i>) in Ghana: Effects of Culture Conditions, Feed and Processing.” <i>Aquaculture, Fish and Fisheries</i> 6, no. 4: e70303. https://doi.org/10.1002/aff2.70303</p><p>In paragraph 6, line 6, of Section 4.1, and in paragraph 2, line 7, of Section 4.2, the citation “(Matea and Avenant-Oldewage 2026)” was incorrect. This should be “(Tunde et al. 2016).”</p><p>In paragraph 3, line 13, of Section 4.3, the citations “(Sáezetal 2015; Acheampong et al. 2025; Osei Tutu et al. 2026)” were incorrect. These should be “(Sáezetal 2015; Acheampong et al. 2025).”</p><p>In paragraph 3, line 18, of Section 4.3, the citations “(Zhu et al. 2016; Kortei et al. 2026; Nyasordzi et al. 2025; Javed et al. 2025)” were incorrect. This should be “(Zhu et al. 2016).”</p><p>In paragraph 2, line 8, of Section 6, the citations “(Oluyemi et al. 2024; Khan et al. 2025; Javeria et al. 2026; Ozmen et al. 2025)” were incorrect. This should be “(Oluyemi et al. 2024).”</p><p>We apologise for these errors.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"6 5","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70320","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942690","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":"Morphometric Relationships, Condition Indices and Size-Dependent Morphometric Shifts in Four Lobster Species From Southeastern Brazil","authors":"Rodrigo Barreto,&nbsp;Andressa Carolina Mendes de Melo,&nbsp;Rayana Brandão Santos,&nbsp;Lucas Galdino Caseiro,&nbsp;Mariana Herpet Salvador,&nbsp;Nadia Ortolan da Vitória,&nbsp;Jones Santander-Neto","doi":"10.1002/aff2.70313","DOIUrl":"https://doi.org/10.1002/aff2.70313","url":null,"abstract":"<p>Reliable morphometric relationships are essential for integrating fisheries datasets collected under different sampling protocols, yet regional information remains scarce for several commercially exploited Brazilian lobsters. We quantified species- and sex-specific morphometric relationships for four commercially important lobster species landed by small-scale fisheries along the southern coast of Espírito Santo, southeastern Brazil. A total of 802 individuals, sampled between April 2020 and March 2025, were measured for total length (TL), cephalothorax length (CL), cephalothorax width (CW) and total weight (TW). Analytical sample sizes varied among species, sexes and models according to data availability and quality-control procedures. Length–weight and length–length relationships were estimated for each species and sex, condition indices were evaluated and segmented regression was used to investigate size-dependent changes in morphometric scaling. Length–weight models explained a large proportion of the observed variation across species (<i>R</i>² = 0.81–0.99), providing reliable empirical conversion equations for fisheries monitoring. Significant sex-specific differences in morphometric scaling were detected for <i>Panulirus laevicauda</i> and <i>Panulirus meripurpuratus</i>, whereas relationships were generally similar between sexes in <i>Scyllarides brasiliensis</i>. Relative condition factor (<i>K</i>n) showed little evidence of systematic size dependence and was considered more appropriate than Fulton's condition factor for biological comparisons among individuals of different sizes. Segmented regression supported size-dependent changes in morphometric scaling only in <i>P. laevicauda</i>, whereas linear relationships adequately described the remaining species. Owing to limited sample size, results for <i>Panulirus echinatus</i> should be interpreted as descriptive. These relationships provide a robust regional reference for converting morphometric measurements, estimating body weight, providing standardized regional biometric parameters for fisheries monitoring and future biological assessments of small-scale lobster fisheries.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"6 5","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70313","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942691","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":"Immunonutritional Effects of Nucleotides and Olive Bioactive Extracts on Growth Performance and Survival of Pacific White Shrimp Upon Vibrio parahaemolyticus (AHPND) Challenge","authors":"Sergi Segarra,&nbsp;José Carlos Quintela,&nbsp;Maxime Vallot,&nbsp;Thanh Chau,&nbsp;Phuc Hoang,&nbsp;Loc Tran","doi":"10.1002/aff2.70297","DOIUrl":"https://doi.org/10.1002/aff2.70297","url":null,"abstract":"<p>The sustainable advancement of aquaculture can be supported using functional feed ingredients with immunomodulatory activity. These studies evaluated the immunonutritional effects of dietary nucleotides (NU) and an olive bioactive extract (OE) in Pacific white shrimp (PWS), <i>Penaeus vannamei</i>. A 56‑day growth trial (<i>n</i>  =  1000 PWS; PL42-43; 1.23 ± 0.23 g; 5.11 ± 0.27 cm) was conducted under a recirculating aquaculture system (RAS) using diets (5.47%–6.06% moisture; 43.03%–43.81% crude protein; 6.95%–7.69% crude lipid; 1.98%–2.28% crude fibre; 9.50%–9.65% ash) supplemented with 500 ppm NU (NU500), 500 ppm OE (OE500), a combination of 500 ppm NU and 500 ppm OE (NU500OE500) or a non-supplemented control diet. In addition, a 10‑day acute hepatopancreatic necrosis disease (AHPND) challenge trial (<i>n</i>  =  600 PWS; PL35; 0.57 ± 0.11 g; 3.85 ± 0.36 cm) induced by <i>Vibrio parahaemolyticus</i> was performed using the same dietary treatments, together with a non‑challenged, non‑supplemented group (positive control). In the feeding trial, compared with the control, all supplemented groups exhibited significantly higher final body weight, weight gain, average daily gain and specific growth rate. Final biomass, feed intake and feed conversion ratio (FCR) were also significantly improved in the NU500 and NU500OE500 groups, with NU500OE500 achieving a significantly lower FCR than all other treatments. Total haemocyte count was significantly increased in the NU500OE500 group, while hyaline cell levels were elevated in all supplemented groups. Results from the challenge trial showed higher survival than the positive control (30.63 ± 4.70%) in the NU500 (33.95 ± 9.62%) and OE500 (40.99 ± 11.07%) groups, but a significant increase was observed only in the NU500OE500 group (55.80 ± 10.02%). In conclusion, the combined supplementation of NU and OE to PWS improved growth performance and immune response in the growth trial, and resistance to AHPND in the challenge trial, supporting its application in shrimp feed.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"6 5","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70297","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942692","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":"Combined Surface-Bottom Aeration: A Pathway to Improved Water Quality and Productivity in Pond-Based Tilapia Farming","authors":"Mithun Roy,&nbsp;Md. Asaduzzaman,&nbsp;Debasish Saha,&nbsp;Md Rakeb-Ul Islam,&nbsp;David C. Little,&nbsp;Richard Newton,&nbsp;Abu Tweb Abu Ahmed,&nbsp;Faruk-Ul Islam,&nbsp;Md. Asadujjaman,&nbsp;Muhammad Tanvir Hossain Chowdhury,&nbsp;Abdullah-Al Mamun","doi":"10.1002/aff2.70322","DOIUrl":"https://doi.org/10.1002/aff2.70322","url":null,"abstract":"<p>Pond-based aquaculture demands effective management of dissolved oxygen (DO) for sustainable intensification to improve productivity. This study evaluated surface aeration (SA), bottom aeration (BA) and combined surface-bottom aeration (SBA) against a non-aerated control during a 120-day monoculture of Nile tilapia (<i>Oreochromis niloticus</i>) stocked at 400 fish/decimal. Water quality and DO dynamics were monitored throughout the culture period, and aeration was initiated on Day 59 when biomass reached 0.58 ± 0.05 kg/m² and morning DO declined below 4 mg/L. Aerated ponds maintained more stable DO regimes than the NA control, whereas SBA achieved comparatively improved DO concentrations across water depths. SBA exhibited significantly (<i>p</i> &lt; 0.05) higher total production (16.47 ± 0.195 MT/ha), faster specific growth (4.39% ± 0.035%), higher survival (96.88% ± 0.22%) and a lower feed conversion ratio (1.41 ± 0.017), whereas treatment NA showed the lowest performance across growth and feed efficiency parameters. Economic analysis aligned with these results, whereas SBA showed favourable cost–benefit ratios (1.14 ± 0.02) and return on investment (13.60% ± 1.36%). However, because SBA involved a higher installed power input than single-mode aeration systems, the observed benefits reflect the performance of the combined aeration configuration under the applied operational conditions rather than a strictly energy-normalized comparison. By simultaneously evaluating spatial oxygen distribution, operational aeration thresholds, biological performance and economic outcomes, this study provides practical evidence supporting integrated SBA as an effective strategy for sustainable intensification of pond-based Nile tilapia farming.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"6 5","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70322","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942338","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":"Morphometrics and Mitochondrial (COI-Based) Molecular Barcoding of Diptychus maculatus Steindachner, 1866, Snow Trout from the Trans-Himalayan Region of Ladakh, India","authors":"Zaheer Abass,&nbsp;Tasaduq Hussain Shah,&nbsp;Farooz Ahmad Bhat,&nbsp;Karankumar Kishorkumar Ramteke,&nbsp;Syed Talia Mushtaq,&nbsp;Sonam Angmo,&nbsp;Manabjyoti Barman,&nbsp;Ishrat Mohd,&nbsp;Sabina Iqbal Darve,&nbsp;Junaid Ahmad Khan,&nbsp;Rinkesh Nemichand Wanjari","doi":"10.1002/aff2.70293","DOIUrl":"https://doi.org/10.1002/aff2.70293","url":null,"abstract":"<p>The present study integrates morphometric analysis, length–weight relationship (LWR), condition factor, and mitochondrial COI-based molecular barcoding to elucidate the biological characteristics of <i>Diptychus maculatus</i> and confirm species identity, respectively, from the Trans-Himalayan region of Ladakh, India. A total of 300 specimens, collected from glacier-fed tributaries of the Indus River (Suru and Shingo rivers), were analysed. Twenty-five morphometric traits exhibited strong, significant positive correlations (<i>r</i> = 0.24–0.94), indicating high morphological integration and proportional body growth typical of rheophilic hill-stream fishes. The LWR showed negative allometric growth (<i>b</i> = 2.89, <i>p</i> &lt; 0.01), indicating that length increased relative to weight. The mean Fulton's condition factor (<i>K</i> = 0.91 ± 0.014) reflected a moderate physiological condition in the population. Molecular analysis of the COI gene confirmed species identity, with a similarity of 97%–98% and revealed clear genetic divergence from closely related Schizopygopsinae species. Phylogenetic analyses supported the distinct placement of <i>D. maculatus</i> in relation to its conspecific sequences, highlighting its evolutionary relationships within the high-altitude cyprinid group. This study provides the first comprehensive morphometric and molecular baseline information for <i>D. maculatus</i> from the Trans-Himalayan Ladakh region, offering critical insights for future conservation and management.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"6 5","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70293","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942446","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":"RSM-Optimised Lactococcus lactis and Schizochytrium limacinum Combination Improves Immunity and Streptococcus agalactiae Resistance in GIFT Tilapia","authors":"Si-Ming Chen,&nbsp;Long-Xun Liu,&nbsp;Qing-Qin Huang,&nbsp;Zi-Chen Zhao,&nbsp;Shu-Min Yang,&nbsp;Zhi-Hong Zhong,&nbsp;Yun Sun,&nbsp;Shi-Feng Wang,&nbsp;Wei-Liang Guo,&nbsp;Yong-Can Zhou","doi":"10.1002/aff2.70315","DOIUrl":"https://doi.org/10.1002/aff2.70315","url":null,"abstract":"<p>This study optimised the dietary supplementation of <i>Lactococcus lactis</i> and <i>Schizochytrium limacinum</i> in genetically improved farmed tilapia (GIFT, <i>Oreochromis niloticus</i>) to improve immunity and resistance to <i>Streptococcus agalactiae</i> infection. Single‑factor experiments and central composite design combined with response surface methodology (CCD‑RSM) were employed for sequential optimisation. A desirability function was developed as the optimisation criterion, integrating percentage survival of <i>S. agalactiae</i>‑infected tilapia, non‑specific immune and antioxidant parameters (total antioxidant capacity, superoxide dismutase, catalase, alkaline phosphatase, and acid phosphatase), and liver health indices (reduced glutathione, alanine aminotransferase, and aspartate aminotransferase). Single‑factor experiments determined optimal individual supplementation levels of 1.5% for <i>S. limacinum</i> and 1.0 × 10⁷ CFU/g for <i>L. lactis</i>. CCD‑RSM revealed that <i>L. lactis</i> significantly affected total antioxidant capacity, catalase, and alanine aminotransferase, while <i>S. limacinum</i> significantly influenced percentage survival of <i>S. agalactiae</i>‑infected tilapia, superoxide dismutase, catalase, alkaline phosphatase, acid phosphatase, alanine aminotransferase, and reduced glutathione, with significant interactive effects between the two supplements on multiple parameters. The RSM‑optimised combination was 5.45 × 10⁷ CFU/g <i>L. lactis</i> plus 0.91% <i>S. limacinum</i>. Tilapia were fed for 28 days with four dietary treatments: the RSM‑optimised combination, <i>L. lactis</i> alone, <i>S. limacinum</i> alone, and a control. The RSM group showed higher superoxide dismutase, catalase, and acid phosphatase activities, lower alanine aminotransferase and aspartate aminotransferase levels, and fewer hepatic vacuoles than other groups. Following <i>S. agalactiae</i> challenge (3 × 10⁸ CFU/kg), the RSM group achieved the highest relative per cent survival (44.12%), followed by <i>L. lactis</i> alone (35.29%) and <i>S. limacinum</i> alone (26.47%). Collectively, the RSM‑optimised combination demonstrates promising potential for enhancing resistance to <i>S. agalactiae</i> infection in GIFT tilapia.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"6 5","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70315","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942129","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":"Growth Patterns, Condition Factor, Sex Ratio and Length at First Maturity of Dominant Fish Species in the Menna River System, Tekeze Basin, Ethiopia","authors":"Tilahun Woretaw,&nbsp;Abebe Getahun,&nbsp;Degsera Aemro,&nbsp;Solomon Birie,&nbsp;Minwyelet Mingist","doi":"10.1002/aff2.70317","DOIUrl":"https://doi.org/10.1002/aff2.70317","url":null,"abstract":"<p>Fish biological parameters are essential for fisheries management. This study assessed the length–weight relationship (LWR), Fulton's condition factor (FCF), sex ratio and length at first maturity (L₅₀) of <i>Labeobarbus intermedius</i>, <i>Labeobarbus nedgia</i> and <i>Labeobarbus beso</i> in the Menna River system, Tekeze Basin, Ethiopia. Sampling was conducted monthly from June 2024 to May 2025 using monofilament gillnets with mesh sizes of 2, 4, 6, 8 and 10 cm. In total, 2127 specimens were collected, comprising 1225 <i>L. intermedius</i>, 501 <i>L. nedgia</i> and 401 <i>L. beso</i>. The LWR of all species were curvilinear and significant (<i>p</i> &lt; 0.001), with strong relationships between fork length (FL) and total weight (TW; <i>r</i>² &gt; 0.90), confirming the suitability of the power function model. Pooled LWR analysis revealed negative allometric growth in <i>L. intermedius</i> (b = 2.91) and <i>L. nedgia</i> (b = 2.86), whereas <i>L. beso</i> (b = 3.04) exhibited isometric growth. Mean FCF values were 1.21 ± 0.17, 1.18 ± 0.16 and 1.40 ± 0.17 for <i>L. intermedius</i>, <i>L. nedgia</i> and <i>L. beso</i>, respectively. Sex ratios deviated significantly from 1:1 (<i>p</i> &lt; 0.05). The estimated L₅₀ values for female and male <i>L. intermedius</i>, <i>L. nedgia</i> and <i>L. beso</i> were 21.47/21.96, 18.50/20.64 and 15.27/16.73 cm FL, respectively. Applying a 20% precautionary safety margin above the L₅₀ of the sex with the larger maturity size (males), recommended minimum landing sizes (MLS) were 26.35, 24.77 and 20.08 cm FL for <i>L. intermedius</i>, <i>L. nedgia</i> and <i>L. beso</i>, respectively. For mixed-species catches where species cannot be reliably identified, a precautionary MLS of 26.35 cm FL is recommended. These findings support sustainable management and conservation of <i>Labeobarbus</i> fish species in the Menna River system.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"6 5","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70317","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148849309","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":"Response of the Diet Composition of Carassius auratus to Water Quality in Dianchi Lake, China","authors":"Qianqian Xiang,&nbsp;Zhihao Ju,&nbsp;Jingjing Li,&nbsp;Yuan Zhou,&nbsp;Minmin Niu,&nbsp;Wenyu Long,&nbsp;Mei Zhang,&nbsp;Wenwu Zhong,&nbsp;Xuexiu Chang","doi":"10.1002/aff2.70290","DOIUrl":"https://doi.org/10.1002/aff2.70290","url":null,"abstract":"<p>Understanding the relationship between the diet composition of fish and water quality is significant for assessing fish responses to habitat changes. However, due to the complexity and diversity of both fish feeding and water quality, the relationship between the diet composition of fish and water quality is not fully understood to date. This study investigated the diet composition of <i>Carassius auratus</i> in Dianchi Lake, China, and their relationship with water quality. Fish and water samples were collected from three sites representing the northern, central, and southern regions of Dianchi Lake, with six fish per site and 18 individuals in total. Gut content analysis showed that the diet composition of <i>C. auratus</i> was mainly <i>Planktothrix</i>, <i>Microcystis</i>, <i>Microsporidium</i>, <i>Brachionus</i>, <i>Cyprinus</i>, and <i>Chanodichthys</i>, and their diet composition was clearly different in space. The correlation results showed that <i>Planktothrix</i> in the gut of <i>C. auratus</i> showed a strong positive correlation with eukaryotic algae, cladocerans, and dissolved oxygen in the water. <i>Microcystis</i> in the gut of <i>C. auratus was</i> positively correlated with temperature and total nitrogen in the water. <i>Brachionus</i> in the gut of <i>C. auratus</i> showed strong negative correlation with water borne cyanobacteria and strong positive correlations with eukaryotic algae and dissolved oxygen. <i>Cyprinus</i> in the gut of <i>C. auratus</i> had a positive correlation with rotifers in the water. Overall, these findings suggest that the diet composition of <i>C. auratus</i> was associated with the abundance of plankton, their availability in the aquatic environment, and variations in the physicochemical properties of the water column. The study's findings provide <i>C. auratus</i> a fresh outlook on how to adjust to changes in lake habitat.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"6 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70290","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752914","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}