Aquaculture Research最新文献

{"title":"Study on the Growth Effects of Gracilariopsis lemaneiformis Under Different Cultivation Methods and Densities","authors":"Jiaxing Wang,&nbsp;Xiaoli Chen,&nbsp;Rui Chen,&nbsp;Jingyu Zhang,&nbsp;Yingtang Dong,&nbsp;Jingyu Wang,&nbsp;Yiyi Hu,&nbsp;Wenfa Zhou,&nbsp;Longfei Lu,&nbsp;Zhenghong Sui","doi":"10.1155/are/8943300","DOIUrl":"https://doi.org/10.1155/are/8943300","url":null,"abstract":"<p>This study comprehensively analyzed the effects of different cultivation methods (CMs) and densities on the growth of <i>Gracilariopsis lemaneiformis</i> in indoor settings and two representative sea areas, Ailun Bay and Nanri Island, located in the northern and southern parts of China. The findings indicate that horizontal hanging cultivation significantly enhanced macroalgal growth and biomass production in both sites. In contrast, vertical hanging cultivation resulted in significantly lower yields, primarily due to inadequate illumination below certain water depths and epibiont infestation. Moreover, integrated multitrophic aquaculture (IMTA) systems co-cultivated with scallops demonstrated biomass and specific growth rates (SGR) similar to those of horizontal hanging cultivation, and nutrient concentrations in the IMTA areas were lower than those in the scallop monoculture areas. These observations suggest a potential role for <i>G. lemaneiformis</i> in nutrient mitigation. Regarding cultivation density (CD), lower densities were beneficial for higher SGR in both regions, with limited impact on final biomass, suggesting that moderately reducing CD could promote growth and reduce seedling use. Within optimal ranges, light intensity positively correlated with SGR; however, excessive light appeared to induce light-related stress or photoacclimation, as well as pigment reduction, in horizontal hanging cultivation, suggesting adverse effects under high-light conditions. In vertical hanging cultivation, reduced light increased pigment content, likely as an adaptive response to insufficient light, while increased density led to decreased SGR indoors, suggesting that resource competition under high-density conditions may limit SGR. Our research indicates that horizontal hanging cultivation at a lower density (0.15 kg/m) can enhance SGR and reduce seedling use without compromising final biomass, suggesting a potential strategy for improving cultivation efficiency. However, the practical adoption of this strategy should also consider site-specific factors such as seed costs, labor availability, and seasonal risks. This study provides useful information for optimizing seaweed cultivation practices and highlights the importance of adopting ecological and sustainable methods in aquaculture.</p>","PeriodicalId":8104,"journal":{"name":"Aquaculture Research","volume":"2026 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/are/8943300","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149205606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Intestinal and Aquatic Microbiota Composition, Diversity, and Function in Glyptosternon maculatum","authors":"Mengyu Wu,&nbsp;Yadong Xu,&nbsp;Wanliang Wang,&nbsp;Jianshen Zhou,&nbsp;ZhuangZhuang Wang","doi":"10.1155/are/1666373","DOIUrl":"https://doi.org/10.1155/are/1666373","url":null,"abstract":"<p>Variations in aquatic environmental characteristics and food resource availability across different habitats lead to habitat-specific differentiation in the structure and function of the fish digestive system. As a key functional component in maintaining host health, fish gut microbiota is critically important for the healthy and sustainable development of aquaculture. In this study, we investigated the gut microbiota of <i>Glyptosternon maculatum</i> from wild, domesticated, and farmed groups, as well as the microbiota in their habitat water, using 16S rRNA gene sequencing. Alpha diversity analysis (one-way analysis of variance (ANOVA) with Tukey’s HSD post hoc test for multiple comparisons) revealed that the Shannon and Simpson indices of the gut microbiota were significantly higher in the wild group than in the domesticated and farmed groups (<i>p</i>  &lt; 0.05), indicating greater community diversity in the wild population. Beta diversity analysis (Adonis test based on Bray-Curtis distances) demonstrated significant separation between the wild group and the other two groups in both intestinal (<i>R</i>² = 0.132, <i>p</i> = 0.026) and water (<i>R</i>² = 0.645, <i>p</i> = 0.002) microbiota, while the domesticated and farmed groups showed similar microbial community structures in both gut and water samples. Mantel tests revealed that pH and dissolved oxygen (DO) were significantly correlated with gut microbial community composition, suggesting these environmental factors may influence the intestinal microbiota of <i>G. maculatum</i>. Functional prediction analysis (PICRUSt2) revealed habitat-associated differences in metabolic functions of the gut microbiota, particularly in amino acid and carbohydrate metabolism pathways. In summary, these findings provide baseline data for understanding habitat-related microbial community shifts in <i>G. maculatum</i> and may inform future conservation and management strategies for this species.</p>","PeriodicalId":8104,"journal":{"name":"Aquaculture Research","volume":"2026 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/are/1666373","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149205651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 Dietary Chlorella Extract Supplementation on Growth, Comprehensive Quality Evaluation of Litopenaeus vannamei: A Combined Analysis of Untargeted Metabolomics and Transcriptomics","authors":"Dan Zhang,&nbsp;Anqi Pang,&nbsp;Xuying Jia,&nbsp;Peng Shao,&nbsp;Jinwei Gao,&nbsp;Man Gao,&nbsp;Wenli Zhou","doi":"10.1155/are/9448780","DOIUrl":"https://doi.org/10.1155/are/9448780","url":null,"abstract":"<p>Chlorella extract (CE) is a natural bioactive component with high nutritional value, which contributes to improved growth performance, enhanced immune status, and regulated physiological metabolism, and the present study was conducted to investigate the effects of dietary supplementation with different levels of CE on the growth performance, flesh quality and flavor, and transcriptomic and metabolomic characteristics of <i>Litopenaeus vannamei</i>. A 60-day feeding trial was conducted using <i>L. vannamei</i> fed diets supplemented with 0% (control), 1%, or 5% CE. Growth performance, body ions and organic acids, body color, texture, and flavor compounds, as well as transcriptomic and metabolomic profiles were subsequently evaluated. The results showed that 1% CE could effectively reduce the NH₄⁺ content in shrimp, decrease bitterness and astringency, increase the content of some organic acids, activate cytoprotective and anti-stress mechanisms, and enhance immune-related metabolic pathways, while 5% CE significantly increased the weight gain rate and specific growth rate of shrimp, reduced the feed conversion ratio, optimized K⁺ levels as well as muscle hardness and chewiness, greatly improved the contents of flavor nucleotides, umami amino acids, and equivalent umami concentration (EUC), and strengthened pathways related to cell proliferation and energy metabolism. Both supplementation levels improved the quality and health status of shrimp, among which the 1% group had obvious advantages in anti-stress response and reducing undesirable flavor, whereas the 5% group exhibited more comprehensive and prominent performance in growth, meat quality, overall flavor and metabolic regulation. In summary, the results of the present study provide a scientific basis for the application of CE as a functional feed additive in shrimp aquaculture. In particular, dietary supplementation with 5% CE comprehensively improved the growth performance, feed utilization, and flesh flavor quality of <i>L. vannamei</i>. These improvements further suggest that CE has potential as a natural feed additive to support more efficient and sustainable shrimp aquaculture.</p>","PeriodicalId":8104,"journal":{"name":"Aquaculture Research","volume":"2026 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/are/9448780","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149205500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Influence of Processed Palm Kernel Meal in the Diet of Colossoma macropomum on Growth Performance, Blood Parameters, Digestive Gene Expression, Somatic Indices, and Whole-Body Composition","authors":"Joane Natividade,&nbsp;Laís Guimarães de Freitas,&nbsp;Rebecca Cristina Reis Vasconcelos,&nbsp;Marcela Cardoso Sena,&nbsp;Debora Sayumi Doami Melo,&nbsp;Jhonas Warlenson Palheta Nobre,&nbsp;Arielly Duarte de Oliveira,&nbsp;Bruno José Corecha Fernandes Eiras,&nbsp;Helen Cristiane Araújo Souza,&nbsp;André Luiz Alves de Sá,&nbsp;Glauber David Almeida Palheta,&nbsp;Fabio Carneiro Sterzelecki,&nbsp;Igor Hamoy","doi":"10.1155/are/9457167","DOIUrl":"https://doi.org/10.1155/are/9457167","url":null,"abstract":"<p>This study evaluated the effects of different physical processing methods of palm kernel meal (PKM) included in experimental diets on growth performance, hematological parameters, gene expression, somatic indices, and body composition of <i>Colossoma macropomum</i> juveniles. The 45-day experiment used 120 juveniles (156.30 ± 5.73 g; 21.40 ± 0.30 cm) randomly and equally distributed among 12 1000-L tanks in a recirculating aquaculture system (RAS), with four treatments: a control diet containing unprocessed PKM (C) and diets containing PKM subjected to water immersion (WI), microwave irradiation (MI), and WI followed by MI (WIMI), with three replicates per treatment. Growth performance, survival, somatic indices, and body composition did not differ among treatments, although the feed conversion ratio (FCR) was higher only in fish fed the WIMI diet (0.98 ± 0.02). Dietary treatments affected several hematological parameters. Fish fed WI showed higher hematocrit (45.67 ± 0.02), mean corpuscular volume (MCV; 253.80 ± 17.67), and mean corpuscular hemoglobin (MCH; 51.98 ± 4.75) than the control group, whereas WIMI reduced total white blood cell (0.009 ± 0.002) and lymphocyte (0.007 ± 0.001) counts. Regarding the expression of genes related to digestion, WI increased the expression of <i>pept1</i> (3.25 ± 2.48) and <i>trypsin</i> (7.56 ± 2.08), indicating a transcriptional response associated with genes related to digestion and peptide transport; however, these changes alone do not demonstrate improved digestive function or nutrient absorption. Overall, physical processing of PKM, particularly WI, influenced hematological responses and the expression of digestion-related genes without affecting growth, survival, or total body composition. Further studies evaluating enzyme activity, nutrient digestibility, and functional protein responses are needed to determine the physiological relevance of these transcriptional changes.</p>","PeriodicalId":8104,"journal":{"name":"Aquaculture Research","volume":"2026 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/are/9457167","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Dynamic Bioeconomic Modeling of Economic-Ecological Benefits in Five Shrimp Farming Models","authors":"Yuzhen Wang,&nbsp;Zhao Chen,&nbsp;Jiajia Wang,&nbsp;Zhiqiang Chang,&nbsp;Yangping Wu,&nbsp;Yu Zhang,&nbsp;Shuangyong Zhang,&nbsp;Jian Li","doi":"10.1155/are/5026531","DOIUrl":"https://doi.org/10.1155/are/5026531","url":null,"abstract":"<p>Optimizing economic and ecological performance is critical for sustainable shrimp farming. This study investigates the dynamic characteristics of economic benefits, optimal harvesting times, and the impacts of price and size on comprehensive benefits across five shrimp farming techniques: the indoor super-intensive culture (ISIC), indoor super intensive recirculating culture (ISIRC), indoor super-intensive biofloc culture (ISBIC), pond monoculture (PMC), and the pond integrated multi-trophic aquaculture model (PIMTA) utilizing a bioeconomic model, Monte Carlo simulation, and meta-analysis. The results indicate that PIMTA and PMC begin generating profits after 44 and 36 days of farming, respectively, demonstrating a distinct advantage in break-even points. ISBIC and ISIC both become profitable after 49 days, with peak net profits per unit yield occurring at 102 and 119 days, respectively. In terms of net profit per unit area, ISIC performs best within a 125-day cycle, reaching a maximum of 35.49 USD m⁻², followed by ISBIC, which peaks at 34.83 USD m⁻² on day 122, while PIMTA and PMC exhibit relatively lower economic returns per unit area. The Monte Carlo simulation reveals overlapping net profit distributions between ISIC and ISBIC, whereas the net profit distribution of ISIRC remains largely independent, with a peak of only 49,145 USD ha⁻¹, and both PMC and PIMTA show lower net profits with narrower distributions. Over the short term (before day 125), ISIC achieves the highest economic returns; however, ISBIC becomes more economically advantageous in the later stages (after day 125). In terms of ecological performance, PIMTA ranks first, followed by ISIRC. The meta-analysis of the collected data indicates that the comprehensive benefits of shrimp farming peak at a size of 70 tails per kilogram. This study provides a scientific basis for farmers to select suitable farming models and formulate dynamic market strategies, thereby contributing to the sustainable development of aquaculture.</p>","PeriodicalId":8104,"journal":{"name":"Aquaculture Research","volume":"2026 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/are/5026531","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149146972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"A Preliminary Evaluation of Propylene Phenoxetol and Menthol Crystals for Anaesthesia of Adult Holothuria (Metriatyla) scabra: Behavioural and Morphometric Responses","authors":"Deepika S. Goundar,&nbsp;Jasha B. Dehm,&nbsp;Kelly T. Brown,&nbsp;Paul C. Southgate,&nbsp;Monal M. Lal","doi":"10.1155/are/5849821","DOIUrl":"https://doi.org/10.1155/are/5849821","url":null,"abstract":"<p>Effective anaesthesia can play an important role in the safe handling of adult sandfish, <i>Holothuria</i> (<i>Metriatyla</i>) <i>scabra</i>, to reduce handling stress, mitigate evisceration risk and make reliable individual morphometric measurements. Handling is required when collecting broodstock for hatchery-based propagation, translocating animals or conducting population surveys. We conducted two independent experiments to evaluate the efficacy of propylene phenoxetol (1-phenoxypropan-2-ol: C₉H₁₂O₂) and menthol crystals (2-isopropyl-5-methylcyclohexanol: C₁₀H₂₀O) as anaesthetic agents at three different concentrations. Propylene phenoxetol was evaluated at concentrations of 0.0025%, 0.01% and 0.02%, while menthol crystal concentrations were 0.5%, 1%, and 2%, respectively. Anaesthetic efficacy was assessed by measuring oral tentacle response latency and morphometric measurements (length, width and weight) over time. Propylene phenoxetol produced weaker and inconsistent effects on oral tentacle response latency and all body measurements. In contrast, menthol crystals induced strong and significant, dose-dependent effects (<i>p</i>  &lt; 0.001). Oral tentacle responses increased with concentration, body length progressively increased over time, and width and weight were affected only at the highest concentration. Progressive relaxation induced by menthol crystal application (following further optimisation) may offer advantages for handling and transport of sandfish, while propylene phenoxetol did not appear to induce a measurable narcotic effect. These findings provide practical guidance for further development of anaesthetic selection in sandfish research and aquaculture operations.</p>","PeriodicalId":8104,"journal":{"name":"Aquaculture Research","volume":"2026 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/are/5849821","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149146837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Dietary Inclusion of Duckweed (Lemnaceae) Modulates Growth Efficiency, Fillet Quality, and Sensory Properties in Common Carp (Cyprinus carpio)","authors":"Eva Gregersen,&nbsp;Birthe Krone,&nbsp;Claire Siebenmorgen,&nbsp;Johanna Mörlein,&nbsp;Angela Sünder,&nbsp;Micha Strack,&nbsp;Rafael H. Mateus-Vargas,&nbsp;Mirja Wilkens,&nbsp;Jens Tetens,&nbsp;Daniel Mörlein,&nbsp;Jürgen Hummel,&nbsp;Simon Rosenau","doi":"10.1155/are/7490971","DOIUrl":"https://doi.org/10.1155/are/7490971","url":null,"abstract":"<p>Identifying alternative protein sources is essential for the sustainable development of aquaculture. Duckweed (<i>Lemnaceae</i>) represents a promising alternative feed ingredient for aquaculture, yet research into its applications as a dietary component is scarce. In this study, 240 mirror carp (<i>Cyprinus carpio var. specularis</i>) with an average weight of 73.4 g, were fed diets containing either 0% (DW0), 10% (DW10), 15% (DW15), or 20% (DW20) duckweed over a 14-week period. Overall, duckweed inclusion in carp diets significantly influenced performance, fillet composition, colour, and sensory attributes. The fish accepted the diets across all treatments. Yet, growth performance was lower in groups receiving duckweed-inclusive diets (<i>p</i> &lt; 0.05) while less differences were found between the inclusion rates. No alterations in meat quality were observed. Fillets from duckweed-fed carp exhibited higher crude protein and ash content, but reduced fat and moisture levels. Skin and fillet colour shifted towards more green and yellow hues in accordance with the increasing dietary duckweed levels. Fatty acid analysis revealed increased proportions of omega-3 and omega-6 fatty acids in fish fillets with inclusion of duckweed, while levels of docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) were comparable across feeding types. Sensory evaluations indicated stronger fishy notes in duckweed-fed carp along with increased sweet odour and a trend towards a buttery taste. This study demonstrates the applicability of duckweed in common carp aquafeeds and its prospects for performance, composition, meat quality, pigmentation and sensory perception, thereby laying the groundwork for further investigations into consumer acceptance, digestibility, and its use in other fish species.</p>","PeriodicalId":8104,"journal":{"name":"Aquaculture Research","volume":"2026 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/are/7490971","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149146835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 Formulated Feed and Forage Fish Feeds on Phytoplankton Community Structure in Mandarin Fish (Siniperca chuatsi) Culture Ponds","authors":"Xiu-xia Zhao,&nbsp;Wen-xuan Lu","doi":"10.1155/are/9905985","DOIUrl":"https://doi.org/10.1155/are/9905985","url":null,"abstract":"<p>The mandarin fish (<i>Siniperca chuatsi</i>) is an economically important carnivorous freshwater fish native to China. Recent studies have explored physiological adaptation mechanisms of mandarin fish to artificial feed. However, diverse feed regimes exerted distinct influences on the aquaculture water environment, and few reports have investigated the phytoplankton community and environmental conditions of mandarin fish (<i>Siniperca chuatsi</i>) aquaculture ponds fed with formulated feed and forage fish. To explore the effects of various feed patterns on phytoplankton community structure and water properties in aquaculture ponds, the experiment was conducted in formulated feed (WF) and forage fish (WB) culturing patterns in Dadukou town, Anhui, China from July to November in 2023. Significant differences in environmental parameters and phytoplankton communities were detected between the two feeding treatments. The WF treatment maintained higher pH, dissolved oxygen, and nutrient concentrations relative to the WB group, whereas chlorophyll a was markedly lower in the WF group. The Shannon diversity index was persistently high and stable in the WF group. The results revealed that the phytoplankton community exhibited distinct patterns between the two groups across all sampling times. The results of nonmetric multidimensional scaling (NMDS) analysis and redundancy analysis (RDA) demonstrated that phytoplankton community composition in the WB group was primarily governed by pH, dissolved oxygen, and ammonia nitrogen. In the WF group, ammonia nitrogen and total phosphorus constituted the key driving environmental factors instead. The study confirmed that variations in feed patterns induced fluctuations in aquaculture water systems. Comparative analysis of two feed patterns demonstrated that the WF group possessed markedly higher phytoplankton species richness and taxonomic diversity relative to the WB group (<i>p</i> &lt; 0.05). Our study recommended formulated feed as the optimal feeding strategy for mandarin fish aquaculture, given its beneficial effects on water quality and phytoplankton community stability. These results facilitated aquatic microecological regulation and optimized formulated feed substitution in mandarin fish cultivation.</p>","PeriodicalId":8104,"journal":{"name":"Aquaculture Research","volume":"2026 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/are/9905985","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149146809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Combined Physical and Biological Cues Enhance Spawning Response in the Hard Clam Meretrix lyrata: Implications for Tropical Bivalve Hatchery Development","authors":"Mohammad Sadequr Rahman Khan,&nbsp;Pranta Bhowmik,&nbsp;Shoman Datta,&nbsp;Harun Or Rashid,&nbsp;Mohammad Najmul Hasan,&nbsp;Md. Atikur Rahman Atik","doi":"10.1155/are/4050847","DOIUrl":"https://doi.org/10.1155/are/4050847","url":null,"abstract":"<p>Reliable hatchery seed production is essential for reducing dependance on wild seed and supporting expansion of marine bivalve aquaculture. This study evaluated three spawning-induction methods for the hard clam <i>Meretrix lyrata</i> under controlled tropical hatchery conditions: heat shock (HS), HS combined with gonad addition (HS + GA), and air shock followed by HS and gonad addition (AS + HS + GA). Wild broodstock were conditioned with a mixed microalgal diet before spawning induction, and embryos and larvae were reared in filtered seawater at 27–29°C. AS + HS + GA produced the highest spawning response (46.67%), significantly exceeding HS (20.00%) and HS + GA (28.89%). Fertilization rates ranged from 55.25% to 63.39% and did not differ significantly among treatments. Hatching rates ranged from 33.48% to 43.55%. The overall treatment effect was not significant (<i>p</i> = 0.0503), although HS + GA differed significantly from AS + HS + GA in the Tukey-adjusted pairwise comparison (<i>p</i> = 0.0388). Embryonic and larval development followed the typical venerid sequence, with first cleavage within 1 h after fertilization (hAF), trochophores at 14–16 h, D-veligers at 24 h, umbonate larvae by day 5, pediveligers by day 6, and settlement by day 18; spat were maintained through day 23. Fertilized eggs, D-veligers, pediveligers, and settled spat measured 70.98 ± 7.94, 100.85 ± 4.99, 119.62 ± 8.20, and 188.33 ± 20.54 µm, respectively. Developmental timing and size progression were broadly consistent with published benchmarks for other venerid clams, providing the first hatchery-based developmental reference for <i>M. lyrata</i> in Bangladesh. Although larval abundance appeared to decline after the pediveliger stage, the study demonstrates the feasibility of induced spawning and larval rearing through settlement under local hatchery conditions. Further optimization of broodstock conditioning, fertilization control, larval feeding, stocking density, settlement management, and microbial regulation is needed to improve hatchery seed-production reliability.</p>","PeriodicalId":8104,"journal":{"name":"Aquaculture Research","volume":"2026 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/are/4050847","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149146496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 Feeding Regimes, Water Temperature, and Flow Velocity on the Rearing Performance of Xenophysogobio nudicorpa","authors":"Rui-Meng Zhou,&nbsp;Huan Zhang,&nbsp;Jing-Yang Xue,&nbsp;Xiao Huang,&nbsp;Jin-Peng Guo,&nbsp;Li-Feng Zhang,&nbsp;Xiao Wang,&nbsp;Tang-Bin Li,&nbsp;Xing-Yu Lu,&nbsp;Zheng-Xuan Gu","doi":"10.1155/are/2303461","DOIUrl":"https://doi.org/10.1155/are/2303461","url":null,"abstract":"<p><i>Xenophysogobio nudicorpa</i> is a small benthic cyprinid endemic to the upper Yangtze River. This study evaluated the effects of first-feeding diets, formulated feeds, water temperature, and flow velocity on larval and juvenile rearing performance. Larvae fed a combination of rotifers and <i>Artemia</i> nauplii achieved the highest survival (90.5%) and balanced growth. For juveniles, a high-protein diet (≥50% crude protein) significantly improved growth (SGR: 0.427%/day) and survival (90%) compared to lower-protein diets or frozen bloodworms. Optimal environmental conditions were identified as 17–19°C and a flow velocity of 20 cm/s, both yielding approximately 90% survival. These findings provide the first comprehensive rearing protocol for this species, supporting conservation aquaculture efforts.</p>","PeriodicalId":8104,"journal":{"name":"Aquaculture Research","volume":"2026 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/are/2303461","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149048090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}