Journal of The World Aquaculture Society最新文献_第9页

Effect of dietary β-carotene supplementation on growth and antioxidant capability of female swimming crab Portunus trituberculatus 膳食中补充β-胡萝卜素对雌性三疣梭子蟹生长和抗氧化能力的影响

IF 2.3 3区农林科学

Journal of The World Aquaculture Society Pub Date : 2024-04-14 DOI: 10.1111/jwas.13073

Tianli Ma, Jie He, Xiaodong Jiang, Qingsong Hu

{"title":"Effect of dietary β-carotene supplementation on growth and antioxidant capability of female swimming crab Portunus trituberculatus","authors":"Tianli Ma, Jie He, Xiaodong Jiang, Qingsong Hu","doi":"10.1111/jwas.13073","DOIUrl":"10.1111/jwas.13073","url":null,"abstract":"Dietary supplementation with synthetic β-carotene was investigated in this study to assess its impact on gonad development, antioxidant status, color parameters, and carotenoid composition in adult female swimming crab (Portunus trituberculatus). Four diets, designated as Diet 1 to 4, were formulated to contain 3.07, 53.78, 103.23, and 205.22 mg/kg dry diets of synthetic β-carotene. The findings revealed the following: (1) No significant differences in body weights or feed utilization were observed, indicating that β-carotene did not significantly enhance the growth of adult P. trituberculatus. (2) The inclusion of 50–100 mg/kg β-carotene in the diets led to improvements in antioxidant capacity indicators (T-AOC, MDA) and immune-related parameters (AKP, ACP) in both hepatopancreas and hemolymph. (3) Notably, the redness of ovaries and hepatopancreas increased significantly with higher dietary β-carotene supplementation for color enhancement. In conclusion, incorporating β-carotene into the diet enhanced the antioxidative capability, nonspecific immunity, and tissue carotenoid contents in adult female P. trituberculatus, and the optimal level of dietary synthetic β-carotene supplementation for adult female P. trituberculatus was suggested to be around 100 mg/kg.","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13073","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140580663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Differences in shrimp pond bottom soil properties and bacterial load between acute hepatopancreatic necrosis disease (AHPND)-infected ponds and AHPND-free ponds and their relation to AHPND 感染急性肝胰腺坏死病（AHPND）的池塘与未感染 AHPND 的池塘在虾池底泥性质和细菌量方面的差异及其与 AHPND 的关系

IF 2.8 3区农林科学

Journal of The World Aquaculture Society Pub Date : 2024-04-11 DOI: 10.1111/jwas.13071

Suwanit Chainark, Pitchaya Chainark, Patcharee Soonsan

{"title":"Differences in shrimp pond bottom soil properties and bacterial load between acute hepatopancreatic necrosis disease (AHPND)-infected ponds and AHPND-free ponds and their relation to AHPND","authors":"Suwanit Chainark, Pitchaya Chainark, Patcharee Soonsan","doi":"10.1111/jwas.13071","DOIUrl":"10.1111/jwas.13071","url":null,"abstract":"This study investigated the disparities in soil characteristics and pathogenic bacteria prevalence between shrimp ponds affected by acute hepatopancreatic necrosis disease (AHPND) and unaffected ponds, alongside examining the spatial distribution of soil attributes in flat-oriented pond soil strata. Using Pearson correlation and logistic regression analyses, relationships among variables and indicators associated with AHPND prevalence were discerned, leading to the formulation of a predictive model for AHPND occurrence. Soil samples were collected from distinct locations and depths within ponds across three southern provinces of Thailand's Andaman Seaboard. The analysis revealed significantly higher concentrations of several variables, including SOD, TIC, NO2−-N, Ca, Mn, Cu, Zn, and specified Vibrio strains, in AHPND-afflicted ponds, especially at 0–5 cm depth. A prominent differentiation was the escalated concentration of easily decomposable organic matter (EDOM) within infected ponds, implicating potential soil and water quality deterioration alongside heightened shrimp susceptibility to AHPND. Correlational analysis showed links between bacterial densities and organic matter groupings, trace elements, exchangeable bases, and soil pH, in AHPND-infected ponds. The logistic regression model encapsulated three soil variables (TOC, Mg, and Mn) and one pathogen variable (V. parahaemolyticus) and furnished an equation to estimate the log (odds) of AHPND occurrence, facilitating better understanding and potential forecasting of AHPND prevalence in shrimp cultivation environments.","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13071","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140580830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Whole-genome resequencing reveals novel sex-related markers and candidate gene in the Chinese soft-shelled turtle (Pelodiscus sinensis) 全基因组测序揭示中华鳖新的性别相关标记和候选基因

IF 2.3 3区农林科学

Journal of The World Aquaculture Society Pub Date : 2024-04-09 DOI: 10.1111/jwas.13069

Dan Zeng, Mengying Chen, Jiawei Zeng, Yangyang Tu, Yucheng Zhang, Meiling Tan, Xiaoqing Wang

{"title":"Whole-genome resequencing reveals novel sex-related markers and candidate gene in the Chinese soft-shelled turtle (Pelodiscus sinensis)","authors":"Dan Zeng, Mengying Chen, Jiawei Zeng, Yangyang Tu, Yucheng Zhang, Meiling Tan, Xiaoqing Wang","doi":"10.1111/jwas.13069","DOIUrl":"10.1111/jwas.13069","url":null,"abstract":"An apparent sexual dimorphism, such as growth rate and immunocompetence, is observed in the Chinese soft-shelled turtle (Pelodiscus sinensis). The identification of sex-related markers and candidate genes holds significance for the sex-controlled breeding of P. sinensis. In this study, through an integration of whole-genome resequencing and Sanger sequencing, 21 female-specific single nucleotide polymorphisms (SNPs) were identified. Based on these SNPs, the rapid and cost-effective molecular methodologies for genetic sex identification in P. sinensis were established. Of note, 19 validated SNPs are located within the zinc and ring finger 3 (ZNRF3) gene, which has been reported to be testis-determining in mammals. Cloning of the ZNRF3 gene from P. sinensis (PsZNRF3) and analysis of its expression profile in tissues and in response to sex steroid hormone treatment demonstrated exhibiting a female-biased expression pattern. These findings not only provide molecular markers for sex-controlled breeding in P. sinensis but also open up a solid basis for revealing the sex-determination mechanism of this species.","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13069","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140586609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Utility of by-products of black soldier fly larvae (Hermetia illucens) production as feed ingredients for Pacific Whiteleg shrimp (Litopenaeus vannamei) 黑翅飞虱幼虫（Hermetia illucens）生产副产品作为太平洋白对虾（Litopenaeus vannamei）饲料成分的实用性

IF 2.3 3区农林科学

Journal of The World Aquaculture Society Pub Date : 2024-04-07 DOI: 10.1111/jwas.13070

Enno Fricke, Reinhard Saborowski, Matthew James Slater

{"title":"Utility of by-products of black soldier fly larvae (Hermetia illucens) production as feed ingredients for Pacific Whiteleg shrimp (Litopenaeus vannamei)","authors":"Enno Fricke, Reinhard Saborowski, Matthew James Slater","doi":"10.1111/jwas.13070","DOIUrl":"10.1111/jwas.13070","url":null,"abstract":"Projected growth in insect production as alternative feedstuffs will yield novel by-products that are potentially valuable for aquafeed applications. We analyzed the nutrient composition of three by-products occurring from black soldier fly larvae production (exuvia, cocoon, imago) and the bioavailability of key nutrients for Pacific Whiteleg shrimp (Litopenaeus vannamei). Protein accounted for 317 g kg−1 in exuviae, 433 g kg−1 in cocoons, and up to 521 g kg−1 in adult flies (imagines). Considerable amounts of essential amino acids were detected in imago meal, which significantly matched the ideal dietary amino acid composition for penaeid shrimp (r2 = 0.66, p = 0.0076). Exuviae and cocoons contained moderate amounts of lipids (64–140 g kg−1), while imagines comprised 356 g kg−1 total lipid. Saturated fatty acids predominated in all insect materials (47%–83% of total fatty acids). Chitin concentration was highest in cocoons and exuviae (154 and 139 g kg−1) and low in imagines (51 g kg−1). A feeding trial with shrimp, L vannamei, revealed apparent digestibility coefficients of 20%–59% for protein, 24%–54% for energy, 25%–49% for carbon, and 27%–68% for copper. Defatting of imago meal increased the digestibility of protein, energy, and carbon by 77%, 64%, and 61%, respectively. Defatted imago meal can serve as a protein supplement for shrimp diets.","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13070","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140586604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impacts of integration of mola with prawn–carp gher farming: An approach to enhance household fish consumption and family income 将鲻鱼与对虾-鲤鱼养殖相结合的影响：提高家庭水产品消费量和家庭收入的方法

IF 2.3 3区农林科学

Journal of The World Aquaculture Society Pub Date : 2024-03-17 DOI: 10.1111/jwas.13066

Shikder Saiful Islam, Saikat Ranjan Mondal, Joyanta Bir, Wasim Sabbir, Md. Abul Kalam Azad, Md. Abdul Wahab, Russell Borski, Khandaker Anisul Huq

{"title":"Impacts of integration of mola with prawn–carp gher farming: An approach to enhance household fish consumption and family income","authors":"Shikder Saiful Islam, Saikat Ranjan Mondal, Joyanta Bir, Wasim Sabbir, Md. Abul Kalam Azad, Md. Abdul Wahab, Russell Borski, Khandaker Anisul Huq","doi":"10.1111/jwas.13066","DOIUrl":"10.1111/jwas.13066","url":null,"abstract":"This study investigated the production performance, household fish consumption, and commercial feasibility of prawn–carp–mola mixed gher farming system. Three treatments with different species compositions were compared: prawn + rohu, prawn + mola, and prawn + rohu + mola, each having different stocking densities. The results indicated that the integration of mola improved the utilization of feed protein by prawns. However, mola inclusion did not significantly affect the growth of prawn and rohu or the production system's cost. Mola inclusion led to a significant increase in the gross production, household consumption, and sale of mola, prawn, and rohu. It also increased gross returns, income above variable cost, and net returns to land, family labor, and management. In addition, the inclusion of mola significantly increased household consumption by increasing the intake of nutrient-rich mola and overall fish consumption. This improvement in food consumption contributed to ensuring the nutritional requirements and food security of impoverished rural farmers, especially women and children. Consequently, the integration of small fish mola in prawn–carp gher farming systems is recommended as a beneficial practice for wider adoption, effectively addressing household nutrition security at the rural level and improving the livelihoods of farmers.","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13066","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140147785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improved growth, body composition, and fatty acid composition in striped catfish juveniles, Pangasianodon hypophthalmus, fed with diets containing different oil sources 用含不同油源的日粮喂养带鱼幼鱼，可改善其生长、体成分和脂肪酸组成

IF 2.8 3区农林科学

Journal of The World Aquaculture Society Pub Date : 2024-03-11 DOI: 10.1111/jwas.13064

Nguyen Van Nguyen, Pham Nhu Hao, Pham Duy Hai, Le Thanh Hung

{"title":"Improved growth, body composition, and fatty acid composition in striped catfish juveniles, Pangasianodon hypophthalmus, fed with diets containing different oil sources","authors":"Nguyen Van Nguyen, Pham Nhu Hao, Pham Duy Hai, Le Thanh Hung","doi":"10.1111/jwas.13064","DOIUrl":"10.1111/jwas.13064","url":null,"abstract":"Striped catfish are one of the main aquaculture species in Asia. However, the low level of omega-3 fatty acids in its body makes this species less attractive compared with marine fish. This study aimed to investigate the effect of different oils on growth performance, body composition, and fatty acids in striped catfish juveniles. A basal diet (T0) was formulated to contain no oil, while four other diets (T1, T2, T3, and T4) were supplemented at 4% with different oils, including salmon oil (SALO), soybean oil (SBO), linseed oil (LSO), and rapeseed oil (RSO). Catfish juveniles with initial body weight (23–24 g/fish) were randomly stocked in 500-L fiberglass tanks, divided into five treatments, three replicates for each, and fed the experimental diets for 60 days. Results from this study revealed that fish fed the LSO-supplemented diet had significantly (p < 0.05) improved whole body omega-3 (alpha-linoleic acid, 18:3n3) fatty acid levels (7.86%), total n-3 fatty acids (9.12%), and higher growth than those fed the other diets. In conclusion, the findings suggest that linseed oil can be used to improve growth, omega-3 fatty acid, C18:3–3 (ALA), and total n-3 PUFA deposition in the whole body of striped catfish juveniles.","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13064","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140116131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of compound plant extracts on growth performance, antioxidant capacity, and histomorphology of liver and intestine of rice field eel (Monopterus albus) 复合植物提取物对稻田鳗（Monopterus albus）生长性能、抗氧化能力以及肝脏和肠道组织形态学的影响

IF 2.8 3区农林科学

Journal of The World Aquaculture Society Pub Date : 2024-03-10 DOI: 10.1111/jwas.13065

Ao Luo, Chunling Song, Xiao Wu, Min Li, Chuanxin Shi, Shanshan Wu, Wei Lei, Peng Fang, Mo Peng

{"title":"Effects of compound plant extracts on growth performance, antioxidant capacity, and histomorphology of liver and intestine of rice field eel (Monopterus albus)","authors":"Ao Luo, Chunling Song, Xiao Wu, Min Li, Chuanxin Shi, Shanshan Wu, Wei Lei, Peng Fang, Mo Peng","doi":"10.1111/jwas.13065","DOIUrl":"10.1111/jwas.13065","url":null,"abstract":"Compound plant extracts (CPE) are beneficial for aquatic animals on growth performance and antioxidant capacity. A 56-day experiment was conducted to investigate its positive effect on rice field eel. The fish were fed a commercial diet and supplementing CPE (mainly containing eucommia polysaccharides, reducing sugar) at 0, 0.8, 1.6, 2.4, and 3.2 g/kg. Results showed that dietary CPE significantly increased weight gain and specific growth rate (p < 0.05). Liver lipid content in 1.6 and 3.2 g/kg groups was significantly lower than in 0.8 and 2.4 g/kg groups (p < 0.05). Muscle lipid content in 0.8, 2.4, and 3.2 g/kg CPE groups was significantly lower than in control (p < 0.05). Meanwhile, intestinal digestive enzymatic activities in the 3.2 g/kg CPE group were the highest in comparison to all other groups (p < 0.05). Dietary CPE enhanced the antioxidant activities of serum and intestine (p < 0.05). Compared with the control, intestinal fold thickness in CPE groups was significantly increased (p < 0.05). Furthermore, dietary CPE reduced the degree of liver steatosis and the number of lipid droplet vacuoles. This study indicated that dietary CPE was beneficial to growth performance, antioxidant capacity, liver, and intestinal histology. Supplementation with 1.6–3.2 g/kg CPE is optimal for this eel species.","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13065","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140106783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Productivity versus environmental sustainability: A broadscale assessment of freshwater aquaculture's technical efficiency and ecological efficiency in China's inland provinces 生产力与环境可持续性：中国内陆省份淡水养殖技术效率和生态效率的广泛评估

IF 2.8 3区农林科学

Journal of The World Aquaculture Society Pub Date : 2024-03-08 DOI: 10.1111/jwas.13057

Zhina Wang, Xuan Chen, Longzhong Shi, Xiaoheng Zhang, Yijuan Hu

{"title":"Productivity versus environmental sustainability: A broadscale assessment of freshwater aquaculture's technical efficiency and ecological efficiency in China's inland provinces","authors":"Zhina Wang, Xuan Chen, Longzhong Shi, Xiaoheng Zhang, Yijuan Hu","doi":"10.1111/jwas.13057","DOIUrl":"10.1111/jwas.13057","url":null,"abstract":"Promoting the productivity and environmental sustainability of aquaculture is critical in ensuring its healthy development. This study assesses freshwater aquaculture's technical efficiency and ecological efficiency in China's 19 inland provinces from 2008 to 2019, aiming to reveal its productivity and environmental sustainability status. We employ the three-stage Data Envelopment Analysis-CCR (T-DEA-CCR) and three-stage Slack-Based Measure-DEA (T-SBM-DEA) methods to explore the technical efficiency and the ecological efficiency while accounting for environmental conditions and random errors. The average technical efficiency and ecological efficiency during 2008–2019 are 0.857 and 0.702, respectively, indicating substantial scope for enhancing the productivity and environmental sustainability of China's inland aquaculture. We further investigate the regional development using the club convergence, finding that the provincial-level technical efficiencies have already achieved population convergence while the ecological efficiencies diverge into two clubs, suggesting that Chinese freshwater aquaculture's productivity and environmental sustainability have different development pathways. Acknowledging the pivotal roles of environmental protection and growers' training in aquaculture's productivity and environmental sustainability, policymakers may institute funding and recognition to foster the adoption of innovative, environmentally responsible practices by operators.","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13057","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140071120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Use of fermented malted barley by-product as partial feed replacement and carbon source for rearing Nile tilapia (Oreochromis niloticus) juveniles 使用发酵麦芽副产品作为尼罗罗非鱼（Oreochromis niloticus）幼鱼饲养的部分饲料替代品和碳源

IF 2.8 3区农林科学

Journal of The World Aquaculture Society Pub Date : 2024-03-07 DOI: 10.1111/jwas.13062

Miguel Cabanillas-Gámez, Juan Gómez-Cadena, Mario A. Galaviz, Gustavo Alejandro Rodríguez-Montes de Oca, Fernando Figueroa-Saavedra, Lus M. López, Idaly Trejo-Escamilla, Fernando Barreto-Curiel, Gilberto López-Valencia

{"title":"Use of fermented malted barley by-product as partial feed replacement and carbon source for rearing Nile tilapia (Oreochromis niloticus) juveniles","authors":"Miguel Cabanillas-Gámez, Juan Gómez-Cadena, Mario A. Galaviz, Gustavo Alejandro Rodríguez-Montes de Oca, Fernando Figueroa-Saavedra, Lus M. López, Idaly Trejo-Escamilla, Fernando Barreto-Curiel, Gilberto López-Valencia","doi":"10.1111/jwas.13062","DOIUrl":"10.1111/jwas.13062","url":null,"abstract":"The present research evaluates the performance of the Nile tilapia (Oreochromis niloticus) (initial weight 11.5 ± 0.07 g) with biofloc technology. For this purpose, spent grains (malted barley) from the brewing industry after aerobic fermentation were used, as both a carbon source (suspended solids) and partial substitute for the diets at 0, 10, 20, 30, and 40% levels (settleable solids). The partial 20% substitution of the diet did not have significant effects on the biological parameters: final body weight, weight gained, average body weight, specific growth rate, daily growth index, condition factor, feed conversion ratio, protein efficiency rate, and viscerosomatic and hepatosomatic indices. However, the dietary substitution showed a significant effect on the final biofloc chemical composition. Nitrogen compounds, NH4+, NO2−, and NO3−, were adequate for tilapia cultivation in all the treatments. No clear effect of partial dietary substitution was observed on meat quality parameters: pH, color, water holding capacity, and amino acid and fatty acid profile of fillet. The results suggest that a 20% substitution of the diet for malted barley is suitable for satisfactory biological parameters and Nile tilapia fillet quality.","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13062","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140071486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Farm strategies and characteristics influencing profitability in Nigerian catfish aquaculture: Lessons on resilience during economic crisis and COVID-type shock 影响尼日利亚鲶鱼养殖盈利能力的养殖策略和特征：经济危机和 COVID 型冲击期间的恢复力经验

IF 2.8 3区农林科学

Journal of The World Aquaculture Society Pub Date : 2024-02-27 DOI: 10.1111/jwas.13058

Olanrewaju Femi Olagunju, Dadi Kristofersson, Tumi Tómasson, Theódór Kristjánsson

{"title":"Farm strategies and characteristics influencing profitability in Nigerian catfish aquaculture: Lessons on resilience during economic crisis and COVID-type shock","authors":"Olanrewaju Femi Olagunju, Dadi Kristofersson, Tumi Tómasson, Theódór Kristjánsson","doi":"10.1111/jwas.13058","DOIUrl":"10.1111/jwas.13058","url":null,"abstract":"Since the early 2000s, aquaculture in Nigeria has grown exponentially. African catfish aquaculture was a major contributor to this expansion. However, a fall in output started in 2015, mostly due to challenging economic conditions which affected farmer's profitability. This challenge has been exacerbated by the COVID-19 pandemic. Notwithstanding, some catfish farms remained profitable. This study investigates the profitability strategies that aid farmers' resilience in times of both economic distress and COVID-type shock. Data from 609 randomly sampled farms across the country were verified and included in the study covering 1118 operations for the pre-COVID and COVID periods. Budgetary analysis was done, and stepwise regression was used to identify factors that most contribute to profitability. These factors were ranked by average profit per kilogram and grouped. The profitability during the periods was influenced by factors within the subcategories of scale of operation, experience, targeted markets, ownership, and pond type. Engagement in other agricultural ventures favored profitability during the COVID period. Profitable and non-profitable groups were further characterized based on their technical and financial indicators. Explored strategies for profitability, including the operation scale, marketing tactics, cost-cutting, and innovative production techniques all proved successful during economic distress and the pandemic.","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13058","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140005792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0