Journal of The World Aquaculture Society最新文献

{"title":"Exploring the economic efficiency of trout farms: The dual impact of temperature and dissolved oxygen at high altitudes","authors":"Hiva Asadikia,&nbsp;Seyed Habibollah Mosavi,&nbsp;Tannaz Alizadeh Ashrafi,&nbsp;Michael R.Reed,&nbsp;Shraddha Hegde,&nbsp;Hamed Najafi Alamdarlo,&nbsp;Sadegh Khalilian","doi":"10.1111/jwas.70047","DOIUrl":"https://doi.org/10.1111/jwas.70047","url":null,"abstract":"<p>Rainbow trout (<i>Oncorhynchus mykiss</i>) are one of the most widely farmed fish species in aquaculture both globally and in Iran. While high-altitude trout farms benefit from colder temperatures favorable to trout farming, they also face challenges due to lower dissolved oxygen (DO) levels inherent to higher elevations. The overall impact of altitude on economic efficiency (EE) remains unclear. This study aims to fill this gap by analyzing the relationship between altitude and EE in trout farming, providing novel insights through the assessment of EE while exploring the effect of altitude in selected high-altitude aquaculture systems in Mazandaran, Iran. Using primary data collected from 25 trout farms in Mazandaran, we calculated EE scores through Data Envelopment Analysis (DEA) and assessed the impact of altitude using the Tobit model. Results indicate an average EE score of approximately 43%, despite subsidies supporting foreign trout egg imports. Findings from the Tobit model reveal that altitude negatively impacts EE, as the reduction in DO levels outweighs the benefits of cooler temperatures. These findings are specific to Mazandaran and may not apply to other regions. Our results suggest that genetic improvements alone (enhancing feed conversion ratios) are insufficient to improve EE in high-altitude farms in Mazandaran. Instead, reallocating subsidies from foreign trout eggs to investments in pressure swing adsorption (PSA) technology can significantly enhance EE by ensuring adequate DO levels. Implementing subsidized PSA equipment offers a practical and policy-relevant strategy to improve EE in high-altitude trout farms in Mazandaran. Future research should also incorporate additional confounding variables—such as broader genetic traits beyond feed conversion ratios (FCR), feed quality, and husbandry practices—to more comprehensively evaluate the drivers of economic efficiency.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"56 4","pages":""},"PeriodicalIF":3.2,"publicationDate":"2025-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.70047","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144758652","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}

{"title":"Evaluation of the nutritional value of sorghum grain for rainbow trout, Oncorhynchus mykiss and hybrid striped bass, Morone chrysops × Morone saxatilis","authors":"Wendy M. Sealey,&nbsp;Steven Rawles,&nbsp;Jesse T. Trushenski,&nbsp;Mohammad Zarei,&nbsp;Steven Urick,&nbsp;Ethan McAlhaney,&nbsp;Tyler Bianchine,&nbsp;Delbert M. Gatlin III,&nbsp;Brent Crafton,&nbsp;Michael Schwarz","doi":"10.1111/jwas.70026","DOIUrl":"https://doi.org/10.1111/jwas.70026","url":null,"abstract":"<p>Aquaculture feeds with optimum digestible starch levels can provide benefits but only through the continued identification and characterization of the available nutrient content of novel or lesser utilized starch sources for a larger variety of aquatic species. To address this literature gap, in vivo digestibility trials were conducted in rainbow trout and hybrid striped bass to determine the available nutrient content of commercially sourced U.S. grain sorghum hybrids. Based on digestibility data, a regression design was employed to test the replacement of wheat flour with U.S. grain sorghum in practical-type diets for rainbow trout and hybrid striped bass at four inclusion levels (0%, 5%, 10%, and 20%). All diets were formulated to contain 40% digestible protein and 18% crude lipid, and balanced to available lysine, methionine, threonine, and phosphorus to targets of 3.82, 1.30, 2.14, and 0.6, respectively, prior to cooking extrusion. For the growth trials, 10 rainbow trout (59.1 ± 0.07 g, initial weight) or 10 hybrid striped bass (27.1 ± 0.1 g) were randomly stocked into triplicate replicate tanks per diet (300 or 500 L, respectively) and fed for eight or nine weeks, respectively to assess effects on growth performance. No significant negative effects of U.S. grain sorghum inclusion on hybrid striped bass final fish weight, growth rate expressed as a percent increase, feed conversion ratio, feed intake, body condition indices, or whole-body proximate composition were observed. The effects of 20% red grain sorghum inclusion on rainbow trout final fish weight were explained by the linear model: <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mtext>Final fish weigh</mtext>\u0000 <mspace></mspace>\u0000 <mfenced>\u0000 <mi>g</mi>\u0000 </mfenced>\u0000 <mo>=</mo>\u0000 <mn>248</mn>\u0000 <mo>−</mo>\u0000 <mn>1.0</mn>\u0000 <mspace></mspace>\u0000 <mfenced>\u0000 <mtext>Sorghum inclusion level</mtext>\u0000 </mfenced>\u0000 </mrow>\u0000 <annotation>$$ mathrm{Final} mathrm{fish} mathrm{weigh} left(mathrm{g}right)=248-1.0 left(mathrm{Sorghum} mathrm{inclusion} mathrm{level}right) $$</annotation>\u0000 </semantics></math>. The reduced growth observed in rainbow trout at the 20% inclusion level underscores the need for additional research to examine the potential beneficial effects of further sorghum processing and optimize feed extrusion parameters when U.S. grain sorghum is used in place of wheat flour.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"56 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.70026","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144714734","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}

{"title":"POET CFP, a corn-fermented protein concentrate, as a potential novel aquafeed ingredient for juvenile European sea bass, Dicentrarchus labrax","authors":"Nicole Martins,&nbsp;Lúcia Vieira,&nbsp;Rui Magalhães,&nbsp;Sara Moutinho,&nbsp;Filipa Fontinha,&nbsp;Ana Couto,&nbsp;Derek Balk,&nbsp;Kevin Herrick,&nbsp;Helena Peres,&nbsp;Simon Davies,&nbsp;Aires Oliva-Teles","doi":"10.1111/jwas.70044","DOIUrl":"https://doi.org/10.1111/jwas.70044","url":null,"abstract":"<p>This study evaluated POET CFP, a corn-fermented protein derived from dry-mill bioethanol production, as a potential candidate for use in European seabass aquafeeds. The apparent digestibility coefficients (ADC) of POET CFP were evaluated and compared to soybean meal. The ADC of POET CFP protein was higher than that of soybean meal (92.7% vs. 83.9%), and the neutral detergent fiber (NDF) of POET CFP was partially digested (26%), while that of soybean meal was completely undigestible. However, the ADC of energy was similar between the two feedstuffs (70%). Two growth trials were performed to evaluate the effect on growth performance and feed utilization of European seabass for total or partial replacement of corn gluten meal (CGM) (Trial 1) or CGM and soybean meal (CGM + SBM) (trial 2) with POET CFP. For that purpose, a practical diet with 48% protein and 18% lipids was formulated to include 20% fish meal, 15% CGM, and 15% SBM (control diet). For trial 1, four diets similar to the control were formulated with POET CFP replacing CGM at 25%, 50%, 75%, and 100%. For trial 2, three other diets similar to the control were formulated, but POET CFP replaced CGM + SBM at 33%, 66%, and 100%. Triplicate groups of European seabass juveniles with 26 g were fed these diets for 85 days. Results of Trial 1 showed that total dietary replacement of CGM with CFP did not affect growth performance, feed intake, feed utilization, and whole-body composition. N retention (% N intake) was also unaffected, but energy retention (% energy intake) linearly increased with dietary CFP inclusion. Further, the histomorphological appearance of the posterior intestine was unaffected by dietary CFP inclusion. Results of trial 2 showed that total dietary replacement of CGM + SBM with CFP did not affect growth performance, feed intake, feed utilization, and N and energy retention (% intake). However, polynomial contrasts showed a significant linear trend for increased growth performance and feed efficiency with the dietary inclusion of CFP. Whole-body dry matter and lipid content linearly decreased with the dietary increase of CFP. No differences were observed between groups in the histomorphological appearance of the distal intestine. This study showed that CFP could completely replace CGM and SBM in diets for European seabass juveniles without affecting growth performance and feed utilization or adversely affecting posterior intestine morphology.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"56 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.70044","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144688191","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}

{"title":"Effect of nursery site on the growth performance of juvenile sea cucumber, Holothuria scabra, in earth pond-based hapa systems","authors":"Lisa Fajar Indriana,&nbsp;Andreas Kunzmann,&nbsp;Matthew James Slater","doi":"10.1111/jwas.70045","DOIUrl":"https://doi.org/10.1111/jwas.70045","url":null,"abstract":"<p>The tropical sea cucumber, <i>Holothuria scabra</i>, plays an important economic and ecological role. Aquaculture of this species has been developing rapidly, and an increasingly effective and efficient system for juvenile production is required. Nursery is a crucial process, as it involves the transition of rearing methods from indoor hatcheries to outdoor environments. This study determined the influence of various nursery sites within earthen pond systems on the growth and survival of juvenile <i>H. scabra</i>. Juvenile <i>H. scabra</i> with a mean wet weight of 1 g (<i>n</i> = 50) were held in replicate floating hapa units over 84 days across four nursery sites: reservoir pond (RP), stirred pond (SP), non-stirred pond (NSP), and main inlet sluice (MIS). Sea cucumbers in MIS exhibited significantly higher weight gain (6.95 ± 0.90 g), growth rate (0.08 ± 0.01 g day⁻¹), and specific growth rate (2.36 ± 0.15% day⁻¹) than all other treatments. Survival did not differ significantly among treatments, ranging from 64.00% ± 2.37% to 74.80% ± 5.82%. The MIS exhibited the highest growth rate for juvenile <i>H. scabra</i>, presumably supported by favorable environmental conditions and effective water exchange. These findings highlight the importance of water circulation and nursery site selection indicating that strategically positioning hapa units close to inlet zones may improve juvenile performance in commercial aquaculture.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"56 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.70045","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144672959","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}

{"title":"Economic analysis of the business model for mass seed production of nutrient-dense small indigenous fish species mola (Amblypharyngodon mola)","authors":"Bimal Kinkar Chand,&nbsp;Sourabh Kumar Dubey,&nbsp;Arun Panemangalore Padiyar,&nbsp;Amar Bharat Gaikwad,&nbsp;Rashmi Ranjan Das,&nbsp;Kalpajit Gogoi,&nbsp;Francois Rajts","doi":"10.1111/jwas.70038","DOIUrl":"https://doi.org/10.1111/jwas.70038","url":null,"abstract":"<p>Small indigenous fish species, such as mola carplet (<i>Amblypharyngodon mola</i>), play a crucial role in the diets of fish-dependent populations in India due to their rich micronutrient content. Recognized as a key species for promoting nutrition-sensitive aquaculture, mola has recently been successfully bred in hatcheries using standardized induced breeding and mass seed production protocols. This study assesses the economic viability of integrating mola seed production into an existing carp hatchery in Odisha, India. A comprehensive financial analysis, including cost-return assessment, bankability, economic performance, break-even analysis, and sensitivity testing, was conducted. The proposed model has a production capacity of 1 million seeds per cycle, with 24 cycles annually. The total investment required is INR 4,12,932 ($4975), comprising capital expenses of INR 2,56,650 ($3092) and annual operational costs of INR 1,56,282 ($1883) considering the loan component. The business model demonstrates strong profitability, with an operational profit margin of 53.57% at a selling price of INR 1000 ($12) per 100,000 hatchlings. The break-even point is achieved at 17 production cycles per year and INR 885 ($10) of per unit of seeds price. Financial indicators confirm high viability, with a benefit–cost ratio of 1.67, a net present value of INR 2,28,233 ($2750), and an internal rate of return of 32.94%. The model is also bankable, evidenced by a debt service coverage ratio of 1.63, and remains profitable under various sensitivity scenarios. These findings highlight the potential for integrating mola seed production into existing carp hatcheries, offering a scalable and sustainable approach to strengthening small indigenous fish farming and advancing nutrition-sensitive aquaculture in India.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"56 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.70038","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144635475","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}

{"title":"Effects of different pond culture conditions on the growth performance, survival rate, and biochemical composition of Acanthopagrus schlegeli and Apostichopus japonicus","authors":"Yuting Lei,&nbsp;Chang Liu,&nbsp;Xinyao Zhuo,&nbsp;Zhiyi Meng,&nbsp;Ruiting Ma,&nbsp;Senhao Jiang","doi":"10.1111/jwas.70037","DOIUrl":"https://doi.org/10.1111/jwas.70037","url":null,"abstract":"<p>In the pond culture production process, culture patterns and conditions have important impacts on the feeding, growth, metabolism, behavior, physiology, biochemistry, and immune responses of aquatic animals. These interact with the ecological environment to jointly determine the production outcome of pond culture. Both of <i>Acanthopagrus schlegeli</i> and <i>Apostichopus japonicus</i> are high economic value mariculture animals. This study investigated the effects of pond monoculture and integrated culture patterns as well as different culture densities, water depths, and background colors used in the integrated culture pattern on the growth performance, survival rate (SR), and biochemical composition of <i>A</i>. <i>schlegeli</i> and <i>A</i>. <i>japonicus</i>. Finally, the suitable conditions for integrated pond culture of <i>A</i>. <i>schlegeli</i> and <i>A. japonicus</i> were obtained. Under the patterns AB (integrated culture of <i>A</i>. <i>schlegeli</i> and <i>A</i>. <i>japonicus</i>), A (<i>A</i>. <i>schlegeli</i> monoculture), and B (<i>A</i>. <i>japonicus</i> monoculture), differences in final body weight (W_t-final), specific daily growth rate (SGR), secondary production (P), and SR were not significant (<i>p</i> &gt; 0.05). However, the overall growth of cultured animals in AB was better than in A or B. The differences in proximate composition between <i>A</i>. <i>schlegeli</i> and <i>A</i>. <i>japonicus</i> were not significant among different culture patterns (<i>p</i> &gt; 0.05), nor were the differences in superoxide dismutase (SOD) activity of <i>A. schlegeli</i> between AB and A (<i>p</i> &gt; 0.05). However, the SOD activity of <i>A. japonicus</i> in AB was significantly higher than in B (<i>p</i> &lt; 0.05). Based on the statistical analysis and actual production situation, density bc (<i>A</i>. <i>schlegeli</i>: 36 ind. m⁻³, <i>A</i>. <i>japonicus</i>: 5 ind. cage⁻¹) would be the most suitable combination for integrated culture of <i>A</i>. <i>schlegeli</i> and <i>A</i>. <i>japonicus</i>. The optimal water depth for integrated culture of <i>A</i>. <i>schlegeli</i> and <i>A</i>. <i>japonicus</i> would be 2 m, and white would be the best background color. Our study results provide useful scientific data for the pond culture production and management of <i>A</i>. <i>schlegeli</i> and <i>A</i>. <i>japonicus</i>.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"56 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.70037","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144615268","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}

{"title":"Supplementation of Pangasianodon hypophthalmus broodstock feed with katuk extract, turmeric powder, and vitamin C before mating resulted in higher fecundity and produced larvae and juveniles with better growth performance","authors":"Awaludin Awaludin,&nbsp;Wasmen Manalu,&nbsp;Andriyanto Andriyanto,&nbsp;Agus Oman Sudrajat,&nbsp;Joni Haryadi","doi":"10.1111/jwas.70040","DOIUrl":"https://doi.org/10.1111/jwas.70040","url":null,"abstract":"<p>Increased vitellogenin availability for deposition in oocytes can improve the success of embryonal growth and development and the quality of catfish larvae and juveniles produced. This study aimed to evaluate the effects of katuk extract, turmeric powder, and vitamin C supplementations for eight weeks before mating on the reproductive success of catfish. The results showed that serum estradiol-17β and vitellogenin concentrations, fecundity, egg diameter and weight, and hatching rate were consistently highest in the catfish supplemented with a combination treatment, and were lowest in the control. The highest egg yolk volume in larvae was observed in the catfish supplemented with the combination treatment (1.53 ± 0.13), and the lowest volume was found in the control (0.97 ± 0.03). The hatched larvae were maintained for three days without feeding, and the results showed that the combination treatment had the highest survival rates (52.00 ± 6.93) and the lowest in the control (13.33 ± 6.11). At the age of 30 days, the highest absolute growth and survival rate was found in larvae produced by the combination treatment, and the lowest was found in the control. It was concluded that supplementation with a combination treatment increased estrogen and vitellogenin synthesis by the hepatocytes, thus increasing vitellogenin deposition in the egg and increasing follicle recruitment to increase fecundity. The results of the present experiment confirmed that improved vitellogenin synthesis and deposition in the ovulated eggs improved fecundity and egg quality, eventually increasing the numbers and quality of larvae and juveniles produced.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"56 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.70040","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144581975","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}

{"title":"Physiological and growth responses of Eucheumatopsis isiformis morphotypes to different light and temperature regimes","authors":"Román Manuel Vásquez-Elizondo,&nbsp;Erika Vázquez-Delfín,&nbsp;Yolanda Freile-Pelegrín,&nbsp;Mayra Sánchez-García,&nbsp;Loretta M. Roberson,&nbsp;Daniel Robledo","doi":"10.1111/jwas.70043","DOIUrl":"https://doi.org/10.1111/jwas.70043","url":null,"abstract":"<p>In the Yucatán Peninsula, México, the red eucheumatoid algae <i>Eucheumatopsis isiformis</i> has been proposed as a candidate for mariculture to obtain carrageenan, a sulfated polysaccharide widely used as a food thickener and stabilizer. As a part of the efforts to develop tropical seaweed cultivation in the region, we studied the photophysiological and growth responses to different light and temperature levels of two morphotypes with contrasting forms and thicknesses, to determine the optimal levels for large-scale cultivation. First, in laboratory experiments, we quantified changes in photosynthesis and respiration rates, pigment content, and growth rate under low-, medium-, and high-light intensities. In a second approach, we scaled up these experiments in a mesocosm system using the optimal light levels identified to test the response to short-term increases in temperature according to seasonal variation. This study showed how irradiance modulated all responses; pigmentation was reduced while photosynthetic capacity, saturation irradiance, and growth increased under high light in both morphs. The thinner morphology (M1) showed the highest photosynthetic capacity and a linear response to light (LL&lt;ML&lt;HL), standing as a better candidate for cultivation. Temperature experiments in M1 showed that light acclimation modulates photosynthesis responses; it was positively affected under low light, while at high light it was not. Hence, light conditions driven by seasonal changes play an important role in the performance of <i>E. isiformis</i>, and special attention should be focused on the vertical cultivation system, which can regulate the incident light to maximize outcomes. The improvement and development of <i>E. isiformis</i> cultures are feasible and could provide an alternative industry for local fishermen, but more information is needed, particularly related to temperature and nutrient availability.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"56 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.70043","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144573584","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}

{"title":"Research on a Pearson-LSTM-AM-based water quality prediction model for freshwater aquaculture","authors":"Wujia Yu,&nbsp;Minghao Wu,&nbsp;Zhenzhou Ha","doi":"10.1111/jwas.70041","DOIUrl":"https://doi.org/10.1111/jwas.70041","url":null,"abstract":"<p>In the field of freshwater aquaculture, water quality significantly impacts the aquaculture products. Fluctuations in water quality can hinder the growth of cultured organisms, lead to frequent diseases, and even cause mass mortality. Therefore, accurately predicting water quality is crucial. To reduce the error rate that may occur when using traditional long short-term memory networks (LSTM) models for water quality prediction, this article proposes a Pearson-LSTM-AM water quality prediction model. Initially, the Pearson correlation test algorithm is used for the input feature selection, and then an attention mechanism is integrated to enhance the LSTM neural network's ability to learn the key features, specifically for predicting the dissolved oxygen (DO) indicator of water quality. Experimental results demonstrate that the proposed method significantly improves upon the Pearson-LSTM model and the LSTM model in terms of root mean square error (RMSE), mean absolute percentage error (MAPE), mean absolute error (MAE), and the coefficient of determination (<i>R</i>²) metrics.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"56 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.70041","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144558128","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}

{"title":"Water quality management strategies for super-intensive culture of Penaeus vannamei with biofloc system: A case study in Virginia, USA","authors":"Otávio Augusto Lacerda Ferreira Pimentel,&nbsp;Bianca de Oliveira Ramiro,&nbsp;Andrezza Carvalho,&nbsp;Flávia Banderó Höffling,&nbsp;Caio Akira Miyai,&nbsp;Wilson Wasielesky,&nbsp;Michael H. Schwarz,&nbsp;Jonathan van Senten,&nbsp;Stephen Urick,&nbsp;Ethan McAlhaney,&nbsp;Fernando H. Gonçalves,&nbsp;Dariano Krummenauer","doi":"10.1111/jwas.70042","DOIUrl":"https://doi.org/10.1111/jwas.70042","url":null,"abstract":"<p>The aim of this case study was to investigate and describe water quality and growth performance of <i>Penaeus vannamei</i> produced in a super-intensive biofloc system (BFT) under diverse water conditions (seawater and low-salinity water) in the state of Virginia, USA. Three individual indoor super-intensive grow-out trials were conducted using a stocking density of 500 shrimp m⁻³ at salinities of 23 g L⁻¹ for 70 days (TI), 28 g L⁻¹ for 69 days (TII), and 2 g L⁻¹ for 30 days (TIII). Key water quality management strategies included: (TI) BFT system; (TII) BFT system and probiotic; (TIII) BFT system, probiotic, water reuse, and artificial substrate. TII exhibited the highest mean total ammonia nitrogen (TAN) concentration (2.60 mg L⁻¹), and the greatest variation in TAN levels, which were controlled from day 35 onward. TAN levels remained relatively stable in TIII. TI exhibited the highest mean nitrite concentration (3.66 mg L⁻¹) and the greatest variation, with a spike that was successfully controlled from day 35 onward. In contrast, nitrite concentrations in TII displayed a continuous upward trend from day 28 without any indication of stabilization. Nitrite concentrations in TIII remained consistently low, never exceeding 0.5 mg L⁻¹ throughout the experiment. Nitrate concentrations exhibited a consistent upward trend across all trials. The final weight of shrimp in TI and TII was 11.03 g and 13.62 g respectively, while in TIII it was 4.86 g. Survival rates were 77.67% in TI, 86.00% in TII, and 87.00% in TIII. Yield values were 4.28, 5.81, and 2.12 kg m⁻³ for TI, TII, and TIII, respectively. Our findings indicated slower nitrification rates in TI and TII compared to TIII. Water reuse, probiotic inoculation, and artificial substrates in TIII resulted in significantly lower and more stable levels of ammonia and nitrite compared to TI and TII, indicating a mature system with improved control for nitrogenous compounds. These findings demonstrate the successful application of integrated BFT strategies, including water reuse, probiotic inoculation, and artificial substrates, in enhancing the super-intensive indoor production of <i>P. vannamei</i> using both seawater and low-salinity water. These results have significant implications for the development of shrimp farming in the state of Virginia, USA.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"56 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.70042","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144558318","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}