Aquaculture, Fish and Fisheries最新文献

{"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}

{"title":"Nursing and Feeding of Asian Seabass (Lates calcarifer) for Freshwater Aquaculture Systems","authors":"Wahidul Abrar,&nbsp;Md. Abu Yousof,&nbsp;Md. Ariful Islam,&nbsp;Prosonjit Chandra Sarker,&nbsp;Md. Ahsanul Haque,&nbsp;Md. Sadiqul Islam,&nbsp;Md. Shahjahan","doi":"10.1002/aff2.70295","DOIUrl":"https://doi.org/10.1002/aff2.70295","url":null,"abstract":"<p>Asian seabass (<i>Lates calcarifer</i>) is a commercially important euryhaline species capable of tolerating a wide range of salinities. It is widely cultured in coastal and brackish-water environments; however, information on its adaptation and performance under freshwater conditions remains limited. Therefore, the present study investigated the potential of integrating Asian seabass into freshwater aquaculture systems through gradual salinity acclimation and subsequent feeding evaluation. Fry with an initial body weight of 0.45 ± 0.21 g (mean ± standard deviation [SD]) were reared at a salinity of 10 ppt for 90 days and then gradually acclimated to freshwater by reducing the salinity from 10 to 0 ppt over a 30-day period. A feeding trial using commercial feed, trash fish and live fish was conducted to evaluate growth and health responses in freshwater-adapted fingerlings under controlled conditions. During saline rearing, fry growth peaked at 6 g with 60% survival. With decreasing salinity (10–7–4–0 ppt), fish weight increased to 8 g with 82% survival at 0 ppt, accompanied by increased haemoglobin levels and decreased blood glucose levels. Chloride cell density decreased progressively with declining salinity. In the freshwater feeding trial, fish fed live fish showed superior growth and specific growth rate with zero mortality, followed by commercial feed and trash fish, whereas trash fish treatment showed the highest mortality (20%). No significant differences in haemoglobin and blood glucose levels were observed among feed treatments, although goblet cell density was highest in fish fed live feed. Overall, the study provides preliminary evidence that Asian seabass can be successfully acclimated to freshwater and maintained under different feeding strategies with acceptable growth and survival.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"6 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70295","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148616623","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":"Assessing Yield Performances and Economic Profitability of Integrated Nile Tilapia (Oreochromis Niloticus Linnaeus, 1758) With Bombay Red Onion (Allium cepa) Farming Systems in Northwest Ethiopia","authors":"Negese Kebtieneh Demlie,&nbsp;Akewake Geremew,&nbsp;Belay Abdissa,&nbsp;Alayu Yalew,&nbsp;Gashaw Tilahun","doi":"10.1002/aff2.70286","DOIUrl":"https://doi.org/10.1002/aff2.70286","url":null,"abstract":"<p>Integrated fish–vegetable is a sustainable food production strategy that synergistically combines fish culture and vegetable cultivation within a single farming system. The objective of this study was to assess integrated Nile tilapia–onion (Bombay red variety) production in northwest Ethiopia, as both fish and onion are commonly practiced by smallholder farmers. The experiment was designed with three fish stocking density levels, low, medium and high, at 3, 5 and 7 fish/m², respectively, in nine geomembrane-lined ponds with a volume of 72 m³ each for a 180-days experimental period. A total of 24 onion plots were integrated with fishponds water under each stocking density with and without chemical fertilizers, while river water with and without chemical fertilizers served as comparative treatments. Results revealed significant enhancement in both fish and onion production and economic profitability across all treatments (<i>p</i> &lt; 0.05), with the highest stocking density consistently delivering superior performance. Fish reared under high stocking density (HSD) achieved 58%, 88.5% and 66.7% higher gross yield (kg/ha), net profit ($/ha) and water-use efficiency (kg/m³), respectively, than those under low stocking density (LSD). Similarly, onion irrigated with fishponds water outperformed non-integrated farming, producing 42% (without chemical fertilizers) and 55% (with chemical fertilizers) higher marketable yields, 1.5 times (without chemical fertilizers) and 1.7 times (with chemical fertilizers) higher water-use efficiency, and 11 times (without chemical fertilizers) and 13 times (with chemical fertilizers) higher net profits ($/ha). Nile tilapia at HSD level (7 fish/m²) integrated with onion maximizes productivity, profitability and water-use efficiency, highlighting potential for policy support and extension promoting sustainable intensification, income diversification and climate-resilient livelihoods in north-western Ethiopia.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"6 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70286","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148616526","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":"Field-Deployable FTA Card for Sampling, Storage and Detection of Aeromonas spp. in Rainbow Trout: Four-Year Ambient DNA Stability Validated","authors":"İfakat Tülay Çağatay","doi":"10.1002/aff2.70287","DOIUrl":"https://doi.org/10.1002/aff2.70287","url":null,"abstract":"<p>Bacterial pathogen detection in rainbow trout (<i>Oncorhynchus mykiss</i>, Walbaum 1792) aquaculture typically involves multi-step procedures, including sample transport, bacterial isolation, culture and subsequent molecular analysis. <i>Aeromonas salmonicida</i> and <i>Aeromonas hydrophila</i> are major pathogens causing significant losses; however, conventional diagnostic workflows are time-consuming and require cold-chain logistics and contamination-prone handling steps. This study evaluated FTA cards for direct pathogen detection from infected trout tissues without culture, integrating sampling, DNA preservation and PCR-based analysis into a single workflow, targeting two virulence (<i>aerA</i>, <i>hlyA</i>), two housekeeping (<i>gyrB</i>, <i>rpoD</i>) and one antibiotic resistance (<i>sul2</i>) genes. The performance of the FTA-based approach was compared with a standard commercial DNA extraction kit (QIAamp) using tissue samples from 62 rainbow trout collected from commercial farms in Türkiye (<i>n</i> = 200 FTA card samples). PCR amplification from FTA cards was successful for all five target genes in 100% of tested samples, yielding amplicons of equivalent sizes and band intensities to those obtained from kit-extracted DNA. DNA extraction from FTA cards was completed in less than 1 h, with an estimated per-sample cost of approximately $1–$2. All five target genes were also successfully amplified from a subset of 50 cards stored at ambient temperature for 4 years (50/50 cards; 100% amplification success). The simplified workflow allows on-site sampling by farm personnel and shipping at ambient temperature, reducing logistical challenges associated with sample transport and storage. These findings indicate that FTA cards provide a practical and reliable alternative for transport, storage and preservation of <i>Aeromonas</i> spp., particularly for field-based applications where rapid processing and simplified sample handling are required.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"6 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70287","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148615861","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":"Variation in Life History Characteristics of Common Bream (Abramis brama) Populations in Sweden","authors":"Göran Sundblad,&nbsp;Joacim Näslund,&nbsp;Malin Hällbom,&nbsp;Jennie Strömquist,&nbsp;Marju Kaljuste,&nbsp;Martina Blass,&nbsp;David Hammenstig,&nbsp;Örjan Östman","doi":"10.1002/aff2.70289","DOIUrl":"https://doi.org/10.1002/aff2.70289","url":null,"abstract":"<p>Knowledge of life history characteristics is important for fisheries management and monitoring of ecosystem integrity. This study examines life history characteristics of common bream (<i>Abramis brama</i>) from Swedish Baltic Sea coastal areas, two larger lakes and five smaller lakes in Sweden. Length–weight parameters, growth (length-at-age) and length at maturity indicated system specific characteristics. Across population averages for length–weight parameters were <i>α</i> = 0.109 and <i>β</i> = 3.145. Age was determined using otoliths and individuals ≥ 19 years old were found in all systems, with the oldest individual at 49 years from the northernmost Baltic Sea. Asymptotic total length (<i>L</i>_∞) was estimated at 54.2 cm as a global average, but it varied more across systems than across growth models. Length at 50% maturity (<i>L</i>₅₀) was larger than anticipated, ranging 43–47 cm across systems. The apparently late maturation needs to be verified by sampling during a larger part of the year to see gonad development, including post-spawning regeneration and the potential prevalence of skipped spawning. For these high latitude populations, we found generally older ages, slower growth and later maturity compared to more southern distributed populations. This study provides essential baseline biological knowledge important for ecological understanding and management of the common bream at higher latitudes and highlights how bream life history characteristics can vary across systems.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"6 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70289","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148615742","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":"Effects of Commercial and Locally Formulated Diets on Growth Performance of Juvenile Oreochromis andersonii in a Hatchery System","authors":"Margaret Ndatoolewe Kanyeme,&nbsp;Evans Kamwi Simasiku,&nbsp;Kudakwashe Hove,&nbsp;Javier Revilla Diez,&nbsp;Samuel Kakambi Mafwila,&nbsp;Titus Iipinge Iita,&nbsp;Simon Kamwele Awala","doi":"10.1002/aff2.70291","DOIUrl":"https://doi.org/10.1002/aff2.70291","url":null,"abstract":"<p>In Namibia, the aquaculture sector faces significant challenges, mainly due to the high cost of imported commercial feed, which limits small-scale farmers' productivity and food security. To address this, locally formulated feeds must be evaluated as sustainable alternatives. A study conducted at the Kamutjonga Inland Fisheries Institute assessed the effects of feed types on the growth and survival of Oreochromis andersonii over 9 weeks. Three locally formulated diets (pearl millet, maize and sorghum) were compared with a commercial pellet diet (control) in a randomised design with three replications. Growth performance indicators, including specific growth rate, weight gain, final body weight, feed conversion ratio and survival rate, were analysed using ANOVA. Results showed no significant differences among treatments; however, the pearl millet diet recorded the highest specific growth rate (3.94 ± 0.16%) and final mean weight (11.29 ± 0.67 g), while the sorghum diet showed the lowest growth rate (3.08 ± 0.40%) and maize resulted in the least weight gain. The pearl millet diet had the most efficient feed conversion ratio (1.92 ± 0.57). The economic evaluation further showed that the pearl millet diet had the lowest economic conversion ratio (N$13.27 per kg biomass gain), making it the most cost-effective diet, whereas commercial pellets recorded the highest feed cost (N$27.58 per kg biomass gain). Survival rates were high across treatments, particularly in pearl millet and commercial diets. These findings indicate that pearl millet–based feed can support growth and survival comparable to commercial pellets while substantially reducing feed costs, making it a promising and economically viable alternative for small-scale aquaculture production in Namibia.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"6 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70291","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148615666","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":"Breeding and Seed Production of Aquaculture Species in Bangladesh: Current Status, Challenges and Prospects","authors":"Zakiur Rahman Sarker,&nbsp;Ilias Ahmed,&nbsp;Mohammad Abu Baker Siddique,&nbsp;Mohammad Mahfujul Haque,&nbsp;A. K. Shakur Ahammad","doi":"10.1002/aff2.70283","DOIUrl":"https://doi.org/10.1002/aff2.70283","url":null,"abstract":"<p>Aquaculture has become one of the fastest-growing food production sectors in Bangladesh and contributes significantly to food security, nutrition, livelihoods and the national economy. In Bangladesh, aquaculture mainly relies on the culture of major carps, catfishes and shrimp, which are also widely farmed across Asia and other parts of the world. This review aims to synthesize the current status of breeding and seed production in Bangladesh, identify key technical and institutional challenges and highlight priority actions to ensure sustainable and resilient aquaculture development. An integrative review was conducted using peer-reviewed literature, government statistics and grey sources related to hatchery practices, broodstock management, genetics, health and biosecurity and policy frameworks. The findings indicate that Bangladesh's aquaculture seed supply is now heavily dependent on hatcheries, with private hatcheries producing about 97% of total seed, while public hatcheries primarily contribute to research, conservation and seed distribution in remote areas. However, seed quality remains inconsistent because of poor broodstock management, repeated use of limited brood lines, weak genetic record-keeping, inadequate biosecurity and limited disease diagnostics. These constraints contribute to genetic erosion, slower growth, reduced survival, disease outbreaks and lower hatchery productivity. The review further indicates that shortages of trained personnel, limited adoption of modern technologies, weak seed certification systems and poor regulatory enforcement continue to restrict sustainable hatchery development. Overall, the long-term growth of aquaculture in Bangladesh will depend on improving broodstock quality, conserving genetic resources, strengthening hatchery health management and ensuring effective governance. Practical priorities include establishing broodstock traceability systems, expanding seed certification, improving biosecurity and diagnostic capacity, promoting selective breeding and climate-resilient hatchery technologies and strengthening public-private collaboration. These measures can improve seed quality, enhance aquaculture productivity and support food security in Bangladesh, while also offering useful lessons for other aquaculture-producing countries facing similar hatchery and seed-system challenges.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"6 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70283","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148615665","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":"Performance Thresholds of Fishmeal Replacement in Probiotic-Supplemented Alternative Protein Diets for Climbing Perch (Anabas testudineus)","authors":"Farjana Khanam Chadnee,&nbsp;Iftekhar Ahmed Fagun,&nbsp;Md. Shakil Khan,&nbsp;Md. Abu Talha,&nbsp;Chayanika Pondit,&nbsp;Md. Sakhawat Hossain","doi":"10.1002/aff2.70288","DOIUrl":"https://doi.org/10.1002/aff2.70288","url":null,"abstract":"<p>Reducing fishmeal (FM) use in aquafeeds is essential for sustainable aquaculture, but excessive replacement with alternative proteins may impair fish growth and physiological performance. This study evaluated the performance thresholds of graded FM replacement in probiotic-supplemented alternative protein diets for climbing perch (<i>Anabas testudineus</i>). Four approximately iso-nitrogenous and iso-energetic diets were formulated using SBM and poultry by-product meal. Diet D1 served as the control (0% FM replacement without probiotic), whereas D2, D3, and D4 contained 70%, 85%, and 100% FM replacement, respectively, and were supplemented with a multistrain probiotic containing <i>Lactobacillus</i> spp. and <i>Corynebacterium glutamicum</i> (0.2%). A total of 360 juveniles (2.52 ± 0.01 g) were fed the experimental diets for 56 days. Growth performance differed among treatments, with D1 producing the highest final body weight (9.65 g) and D4 the lowest (6.09 g). Fish fed D2 maintained final body weight (8.35 g), weight gain (231.81%), and specific growth rate (2.14% day⁻¹) comparable to the control. Plasma glucose, total protein, GOT, GPT, triglycerides, and cholesterol did not differ significantly among treatments. Nitro blue tetrazolium activity did not differ significantly, whereas plasma peroxidase activity was significantly higher in D1 than in D3 and D4, with D2 showing an intermediate response. Salinity stress tolerance (LT₅₀) was significantly higher in D1 (41.95 min) than in D4 (35.43 min), while D2 and D3 showed intermediate values. These findings indicate that approximately 70% FM replacement within the present probiotic-supplemented dietary framework maintained growth performance and selected physiological responses broadly comparable to the control under the present experimental conditions, whereas complete FM replacement reduced growth performance and salinity stress tolerance. The study provides practical guidance for developing cost-effective and environmentally sustainable feed formulations for climbing perch within a functional dietary framework rather than evaluating additive-specific effects.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"6 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70288","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148534040","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":"Indigenous Harvest Practices, Seasonality, and Market Pathways of Small-Scale Clam Fisheries in Coastal Bangladesh","authors":"Mohammad Najmul Hasan,&nbsp;Harun Or Rashid,&nbsp;Mst Mansura Khan,&nbsp;Sohel Rana,&nbsp;Mohammad Sadequr Rahman Khan","doi":"10.1002/aff2.70284","DOIUrl":"https://doi.org/10.1002/aff2.70284","url":null,"abstract":"<p>This study assesses the current status, indigenous harvesting techniques, seasonal dynamics and market value chain to identify constraints and opportunities of the small-scale clam fishery along the southeast coast of Bangladesh. Data were collected from 216 stakeholders across 11 coastal sites using structured interviews, focus group discussions and field observations. Statistical analyses (ANOVA, <i>t</i>-tests, Pearson correlation) were conducted to examine spatial and gender-based variations in harvesting efficiency. Results indicate that clam harvesting is practised year-round, peaking between November and May. Women collectors demonstrated harvesting efficiency comparable to men (catch per trip: <i>t</i>(86) = 0.96, <i>p</i> &gt; 0.05). The primary methods include hand-picking, with local innovations such as manually operated oxygen pumps, the <i>Teda</i> probing tool and homemade dredgers improving efficiency. Key harvest attributes varied significantly among sites, including collecting time (<i>F</i>₅,₈₂ = 10.46, <i>p</i> &lt; 0.001), catch frequency (<i>F</i>₅,₈₂ = 13.05, <i>p</i> &lt; 0.001) and seasonal price (<i>p</i> &lt; 0.001). Nine market channels and 16 stakeholder groups were documented, though middlemen dominate the value chain, limiting collectors’ direct market access. By-products like shells are used in lime production, poultry feed and handicrafts, supporting local livelihoods. Harvest levels were positively associated with site and community. Despite high demand among tribal communities, market growth is constrained by religious perceptions among the Muslim majority, who largely refrain from mollusc consumption. This study highlights the ecological and socio-economic significance of the clam fishery and emphasizes the need for institutional support, integration of indigenous practices and improved market access to advance sustainable coastal development and blue economy goals in Bangladesh.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"6 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70284","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148534041","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":"Dietary Tea Polyphenols Improve Growth Performance, Physiological Health and Economic Efficiency in Nile Tilapia (Oreochromis niloticus)","authors":"Shishir K. Nandi,&nbsp;Md. Abdullah Al Mamun Hridoy,&nbsp;Ashfaqun Nahar,&nbsp;Md. Abdullah Al Mamun,&nbsp;Muhammad A. B. Siddik","doi":"10.1002/aff2.70282","DOIUrl":"https://doi.org/10.1002/aff2.70282","url":null,"abstract":"<p>Tea polyphenols (TPs) are natural bioactive compounds extensively used in aquaculture diets as a functional supplement because of their antioxidant, antimicrobial and immunomodulatory potential. Four isonitrogenous diets (crude protein: 30%) were designed with incorporating TPs at levels of 0% (control, TPs-0), 0.025% (TPs-1), 0.05% (TPs-2) and 0.075% (TPs-3) and fed to Nile tilapia for 60 days. The final weight, per cent weight gain (WG), specific growth rate, live WG, feed conversion ratio and protein efficiency ratio were significantly improved (<i>p</i> &lt; 0.05) with increasing dietary TPs supplementation. Visceral–somatic index and hepatosomatic index were significantly greater (<i>p</i> &lt; 0.05) in the TPs-0 treatment. Nile tilapia fed with TPs-supplemented diets revealed significant variations (<i>p</i> &lt; 0.05) of different haemato-biochemical parameters. Dietary TPs also improved gut morphology, including villi height, villi width and goblet cell distribution, with the most pronounced effects found in the TPs-3 group. Fish fed the TPs-0 diet exhibited a higher number of vacuoles, decreased nuclei and cytoplasm, and degenerative hepatocytes. Economic efficiency was significantly (<i>p</i> &lt; 0.05) upgraded in the TPs-3 diet, evidenced by greater farm raw margin, increased revenue, enhanced return on investment and lower farm feed cost. These findings suggest that the ameliorative roles of TPs on growth, health and economic performance are dose-dependent, and the most effective dose could be 0.075%.</p>","PeriodicalId":100114,"journal":{"name":"Aquaculture, Fish and Fisheries","volume":"6 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aff2.70282","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148534077","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}