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Featured Cover: Cover Image, Volume 5, Issue 5 特色封面:封面图片,第五卷,第五期
IF 1.9 Q3 FISHERIES Pub Date : 2025-10-15 DOI: 10.1002/aff2.70126

The cover image is based on the Original Article by Evaluation of Nutrient Flow Through and Media-Bed Aquaponic Systems by Belay Abdissa et al., https://doi.org/10.1002/aff2.70122.

封面图片基于Belay Abdissa等人的《评价营养流动和介质床水培系统》一文,https://doi.org/10.1002/aff2.70122。
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引用次数: 0
Research on the Application of Green Ecological Additive Combinations During the Breeding Period of Redclaw Crayfish 绿色生态添加剂组合在红螯虾养殖期间的应用研究
IF 1.9 Q3 FISHERIES Pub Date : 2025-10-14 DOI: 10.1002/aff2.70124
Cheng Shun, Chi Mei-Li, Jiang Wen-Ping, Zheng Jian-Bo, Liu Shi-Li, Zhu Chao, Hang Xiao-Ying, Peng Miao, Li Fei

The three key processes in the breeding of redclaw crayfish are nutrient enhancement by parents, catching and hatching of egg-holding crayfish and maintaining a feed supply for juveniles. An appropriate combination of green ecological additives is beneficial for improving the production efficiencies of the three key processes. Three experiments were conducted. Experiment 1: Five additive combinations were added to the feed of the parents. The results showed that adding 30% special feed powder (25% methyl farnesyl ester + 10% schizonts powder + 10% purple algae powder + 5% serotonin creatinine sulphate + 7.5% flaxseed oil + 7.5% alanine hydroxamic acid) to the feed was beneficial for improving the egg-holding effect of crayfish. Experiment 2: The application of a mixed ecological preparation composed mainly of eugenol for the anaesthesia and disinfection of red crayfish was investigated. The results showed that 400 mg/L eugenol + 10 mg/L cinnamaldehyde + 50 ppm acacia essential oil + 60 mmol/L trehalose + 4 ppm vitamin C + 2 ppm vitamin A + 2 ppm vitamin E had good anaesthetic and disinfectant effects, reducing the loss of eggs caused by stress-induced tail bouncing during the grasping process and achieving a high hatching and survival rate of juveniles, and high activity of antioxidant and immune-related enzymes. Experiment 3: Six additive combinations were added to the feed of the juveniles. We speculated that adding 10% spirulina powder + 3% astaxanthin + 2% flaxseed oil + 3% Antarctic krill oil + 2% riboflavin to the feed improved the survival rate, growth rate and digestive enzyme activity of juveniles. We recommended that these three combinations of green ecological additives be widely applied in the breeding of redclaw crayfish.

红爪小龙虾繁殖的三个关键过程是:亲本营养增强、产卵小龙虾的捕获和孵化、幼虾的饲料供应。合理搭配绿色生态添加剂,有利于提高三大关键工序的生产效率。进行了三个实验。试验1:在亲本饲料中添加5种添加剂组合。结果表明,饲料中添加30%的专用饲料粉(25%法尼酯甲酯+ 10%裂殖菌粉+ 10%紫藻粉+ 5%硫酸5 -羟色胺肌酸酐+ 7.5%亚麻籽油+ 7.5%丙氨酸羟肟酸)有利于提高小龙虾的保蛋效果。实验二:研究以丁香酚为主要成分的混合生态制剂在红螯虾麻醉消毒中的应用。结果表明,400 mg/L丁香酚+ 10 mg/L肉桂醛+ 50 ppm金合欢精油+ 60 mmol/L海藻糖+ 4 ppm维生素C + 2 ppm维生素A + 2 ppm维生素E具有良好的麻醉和消毒效果,减少了抓鱼过程中应激引起的尾弹跳造成的卵损失,幼鱼的孵化率和成活率高,抗氧化和免疫相关酶活性高。试验3:在幼鱼饲料中添加6种添加剂组合。我们推测,饲料中添加10%螺旋藻粉+ 3%虾青素+ 2%亚麻籽油+ 3%南极磷虾油+ 2%核黄素可提高幼鱼的成活率、生长率和消化酶活性。建议这三种绿色生态添加剂的组合在红螯虾养殖中得到广泛应用。
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引用次数: 0
Broodstock Selection Strategies to Control Blackspot Blotches Inheritance in Hybrid Red Tilapia (Oreochromis spp) for Sustainable Fingerling Production 控制杂交红罗非鱼黑斑病遗传的种鱼选择策略及种鱼可持续生产
IF 1.9 Q3 FISHERIES Pub Date : 2025-10-07 DOI: 10.1002/aff2.70123
Fredrick Juma Syanya, Zachariy Oreko Winam, A. R Nikhila Khanna, Harikrishnan Mahadevan, Megha Lovejan, Paul Mumina

Red tilapia is an increasingly important aquaculture species due to its rapid growth and high consumer preference. However, variation in pigmentation, particularly blotched phenotypes, reduces market value and uniformity of fingerlings. This study assessed the effects of broodstock pigmentation phenotype on progeny survival, growth performance, reproductive success and pigmentation inheritance. Four broodstock cross combinations were established: Cross A (plain red × plain red), Cross B (blotched male × plain red female), Cross C (blotched × blotched) and Cross D (plain red male × blotched female). Broodstocks were stocked in hapas and reared under standardised conditions in a ratio of 1 male to 3 females. Each treatment group was done in triplicate hapas. Data were collected on hatching success, survival, growth performance and pigmentation phenotype distribution. Survival, hatching success and growth performance did not differ significantly amongst the four crosses (p > 0.05), with survival averaging 85.6%–86.9% and weight gains 7.1–7.4 g. In contrast, pigmentation segregation showed significant differences (p < 0.05). Cross A produced significantly higher plain red progeny (94.6% [18.2:1 ratio]), while Cross C recorded markedly higher blotched offspring (73.4% [1:2.7 ratio]). Crosses B and D yielded intermediate distributions (40%–43% blotched; 1.3–1.4:1 ratio). Maternal versus paternal blotched origin did not significantly alter body pigmentation outcomes. The study concludes that pigmentation inheritance in red tilapia is heritable and consistent with a polygenic model with major-effect alleles. Plain red male × plain red female crosses are the most effective for producing uniform progeny with high market value. Hatchery managers are advised to prioritise plain red broodstock and avoid blotched parents when the goal is consistent pigmentation. Future research should integrate molecular tools to refine selective breeding strategies and strengthen sustainable seed production systems.

红罗非鱼由于其快速的生长和高度的消费者偏好而成为越来越重要的水产养殖品种。然而,色素沉着的变化,特别是斑点表型,降低了鱼种的市场价值和均匀性。本研究评估了亲鱼色素沉着表型对后代存活率、生长性能、繁殖成功率和色素沉着遗传的影响。建立了4个亲种鱼杂交组合:杂交A(素红×素红)、杂交B(斑点雄×素红雌)、杂交C(斑点×斑点)和杂交D(素红雄×斑点雌)。在标准化条件下,以1公3母的比例饲养亲鱼。每个治疗组进行三次试验。收集了孵化成功率、成活率、生长性能和色素沉着表型分布等数据。4个杂交的成活率、孵化成功率和生长性能差异不显著(p > 0.05),平均成活率为85.6% ~ 86.9%,增重7.1 ~ 7.4 g。相比之下,色素沉着分离有显著差异(p < 0.05)。​杂交B和D为中间分布(40%-43%斑点化,比例为1.3-1.4:1)。母亲和父亲的斑点来源没有显著改变身体色素沉着的结果。本研究认为,红罗非鱼色素遗传具有可遗传性,符合主效等位基因的多基因模式。普通红雄×普通红雌杂交最能产生统一的后代,具有较高的市场价值。孵化场管理人员被建议优先考虑纯红色的亲鱼,当目标是一致的色素沉着时,避免斑点父母。未来的研究应整合分子工具,以完善选择性育种策略和加强可持续的种子生产系统。
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引用次数: 0
Effects of Differential Commercial Husbandry Conditions on the Tasmanian Atlantic Salmon Egg Transcriptome 不同商业养殖条件对塔斯马尼亚大西洋鲑鱼卵转录组的影响
IF 1.9 Q3 FISHERIES Pub Date : 2025-10-02 DOI: 10.1002/aff2.70120
Xin Zhan, Mark Adams, Louise Adams, Gianluca Amoroso, Kelli Anderson

Maternally inherited transcripts are crucial for the developmental competence of salmon embryos. Due to the wide variety of broodstock conditioning approaches used in commercial aquaculture, there is a need to understand how dynamic commercial environments impact the egg transcriptome and subsequent quality. In this study, the transcriptomic profile of eggs was dependent on the broodstock conditioning approach, with 156 isoforms significantly down-regulated and 105 significantly up-regulated in the flow-through (FT) relative to the recirculating aquaculture system (RAS)-based group. In FT-based eggs, a down-regulation of genes related to survival (CCCTC-binding factor), growth (DEAH (Asp-Glu-Ala-His) box polypeptide 33), left-right pattern development (Protein canopy-1), and yolk hydrolysis (Cathepsin B) was observed, whereas up-regulation was observed for genes related to bone and tissue development (Metalloproteinase inhibitor 2) and energy production (Cytochrome c oxidase II, mitochondrial). Subsequent embryo quality (neural streak development, embryo survival, and developmental progression) was apparently lower in the FT-based group. As such, there is evidence to suggest that routine husbandry approaches (and associated differences in water quality) have a significant impact on egg quality, and this is underpinned, at least in part, by changes in the maternally inherited transcriptome.

母系遗传转录本对鲑鱼胚胎的发育能力至关重要。由于商业水产养殖中使用的各种各样的养鱼调节方法,有必要了解动态商业环境如何影响鸡蛋转录组和随后的质量。本研究发现,与循环水养殖系统(RAS)组相比,通流(FT)组有156个转录组显著下调,105个转录组显著上调。在ft基鸡蛋中,观察到与存活(ccctc结合因子)、生长(DEAH (aspu - glu - ala - his)盒多肽33)、左右模式发育(Protein canopy-1)和蛋黄水解(Cathepsin B)相关的基因下调,而与骨骼和组织发育(金属蛋白酶抑制剂2)和能量产生(细胞色素c氧化酶II,线粒体)相关的基因上调。随后的胚胎质量(神经条纹发育、胚胎存活和发育进展)在ft组明显较低。因此,有证据表明,常规饲养方法(以及相关的水质差异)对鸡蛋质量有重大影响,这至少在一定程度上是由母系遗传转录组的变化所支撑的。
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引用次数: 0
Abiotic and Biotic Factors Influencing Largemouth Bass Growth in Wisconsin 影响威斯康星州大口黑鲈生长的非生物和生物因素
IF 1.9 Q3 FISHERIES Pub Date : 2025-09-30 DOI: 10.1002/aff2.70121
Rylan J. Thommes, Colin J. Dassow, Greg G. Sass

Fish growth can be highly variable among populations of the same species due to differences in abundance, system productivity and watershed characteristics. Because of this, understanding factors that influence fish growth and body condition is important to managers for fish conservation, to meet angler desires and to support local economies. As ecosystems respond to a changing climate, species compositions can change. In north temperate lakes, this is often exemplified by an increase in largemouth bass (LMB). These lakes are often managed for multiple fish species concurrently, making standardized fishery-independent LMB data limited, creating challenges for managing this species. As such, a better understanding of factors influencing LMB body condition and growth may become critically important in the future. We assessed LMB age, length, and weight data to test for abiotic and biotic lake characteristics explaining variation in LMB body condition, asymptotic length, and mean length at age metrics in Wisconsin from 1994 to 2022. Macrophyte species composition and lake classification relationships were the two primary predictors of variation in LMB growth. Lakes with degraded macrophyte communities were associated with larger individual LMB sizes as were lake class types that contained cool water and riverine characteristics. Our results provide fisheries managers with options when dealing with diverse angler desires and a heterogenous landscape of lakes. Where available, macrophyte species composition data can be consulted by managers to identify opportunities to provide a trophy fishing experience in a system that otherwise would be undervalued. As populations of LMB increase in Wisconsin lakes, a better understanding of how to effectively reach goals set by managers, and what realistic goals might be, is required, and understanding what lake characteristics can explain variation of body condition gives insight to that end.

由于丰度、系统生产力和流域特征的差异,同一物种种群之间的鱼类生长变化很大。正因为如此,了解影响鱼类生长和身体状况的因素对于鱼类保护、满足垂钓者的需求和支持当地经济的管理者来说非常重要。随着生态系统对气候变化的反应,物种组成也会发生变化。在北温带湖泊中,这通常以大口黑鲈(LMB)的增加为例。这些湖泊通常同时管理多种鱼类,这使得标准化的渔业独立LMB数据有限,为管理这些物种带来了挑战。因此,更好地了解影响LMB身体状况和生长的因素在未来可能变得至关重要。我们评估了LMB的年龄、长度和体重数据,以检验1994年至2022年威斯康星州LMB身体状况、渐近长度和年龄指标平均长度变化的非生物和生物湖泊特征。大型植物种类组成和湖泊分类关系是LMB生长变化的两个主要预测因子。大型植物群落退化的湖泊具有较大的个体LMB大小,具有冷水和河流特征的湖泊类型也是如此。我们的研究结果为渔业管理人员提供了在处理不同垂钓者的愿望和湖泊异质景观时的选择。如果有的话,管理人员可以参考大型植物物种组成数据,以确定在系统中提供战利品捕鱼经验的机会,否则这些经验将被低估。随着威斯康星州湖泊中LMB种群的增加,我们需要更好地了解如何有效地达到管理者设定的目标,以及现实的目标可能是什么,并了解湖泊特征可以解释身体状况的变化,从而实现这一目标。
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引用次数: 0
Preservation Time on Ice Impacts Global Gene Expression in Oyster Spat 冰冻保存时间对牡蛎贝基因表达的影响
IF 1.9 Q3 FISHERIES Pub Date : 2025-09-23 DOI: 10.1002/aff2.70115
Anita Alice Severn-Ellis, Hosna Gholipourkanani, Cecile Dang

The pearling industry is one of Australia's most valuable and iconic industries, creating significant economic and employment opportunities across Northern Australia. To improve our understanding of the relationship between the silver-lipped pearl oyster and its biotic and abiotic environment using transcriptomics, oyster spat are collected weekly from several offshore sites in Northwestern Australia. However, due to the remoteness of the farming locations, collected spat must be transported on ice for intervals before snap-freezing becomes possible. In this study, we investigate the impact of incubation on ice for intervals of up to 90 min on the global gene expression of collected spat. Preserving spat on ice for up to 90 min did not significantly impact the RNA concentration or quality. On average, more than 100 ng/µL of RNA (RIN 7.0–8.5) was extracted per sample to generate sequencing libraries, and no significant impact on sequencing and mapping reads to the genome was observed between treatments. However, prolonged incubation on ice did alter gene expression, with a significant increase in differential gene expression observed after 60 min. Furthermore, changes in the number of predicted genes, potentially in response to stress and cold, including stress-related heat shock protein (HSP) and Cytochrome P450 (CYP) genes, immune-related perlucin-like genes, and solute carrier (SLC) transporters, were observed with prolonged incubation. The observed stress-induced changes can alter the global gene expression status of the spat at the time of collection and may lead to misinterpretations upon analysing the impact of abiotic and biotic factors on the health of silver-lipped pearl oyster spat. Prolonged incubation intervals of oyster spat on ice destined for RNASeq analysis are therefore not recommended. Remote sites for longitudinal and comparative studies were therefore selected with this guideline in mind. This study also demonstrates the importance of conducting pilot trials in the development of research study protocols.

珍珠产业是澳大利亚最具价值和标志性的产业之一,在整个北澳大利亚创造了重要的经济和就业机会。为了提高我们对银唇珍珠牡蛎及其生物和非生物环境之间关系的理解,我们每周从澳大利亚西北部的几个近海地点收集牡蛎贝。然而,由于养殖地点偏远,收集的贝必须在冰上运输一段时间后才能进行速冻。在这项研究中,我们研究了在冰上孵育长达90分钟对收集的贝的整体基因表达的影响。将唾液在冰上保存90分钟对RNA浓度和质量没有显著影响。平均每个样品提取超过100 ng/µL的RNA (RIN 7.0-8.5)以生成测序文库,并且在处理之间未观察到对基因组测序和定位reads的显着影响。然而,在冰上长时间孵育确实改变了基因表达,60分钟后观察到差异基因表达显著增加。此外,随着培养时间的延长,可以观察到可能对应激和寒冷做出反应的预测基因数量的变化,包括应激相关热休克蛋白(HSP)和细胞色素P450 (CYP)基因、免疫相关perlucin样基因和溶质载体(SLC)转运蛋白。所观察到的胁迫诱导的变化可能会改变采集时贝的整体基因表达状态,并可能导致在分析非生物和生物因素对银唇贝健康的影响时产生误解。因此,不建议延长牡蛎在冰上的孵育间隔,以进行RNASeq分析。因此,在选择进行纵向和比较研究的偏远地点时,考虑到这一指导方针。本研究还证明了在制定研究方案时进行试点试验的重要性。
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引用次数: 0
Optimizing Exogenous Protease Supplementation in Nile Tilapia Diets: Impacts on Performance, Fillet Quality and Intestinal Morphology 优化尼罗罗非鱼饲料中外源蛋白酶的添加:对生产性能、鱼片品质和肠道形态的影响
IF 1.9 Q3 FISHERIES Pub Date : 2025-09-23 DOI: 10.1002/aff2.70119
Naiane Cristina de Lima Silva, Mario Augusto Monteiro Silva, Maria Érica da Silva Oliveira, Joice Teixeira Souza, Ana Cecília Araújo Lopes, Vanessa Maria Freitas da Silva, Marcos Aurelio Victor de Assunção, Romulo de Carvalho Cabral, Natanael Silva Félix, Moacir Franco de Oliveira, Juliana Forgiarini, Matheus Ramalho de Lima

This study aimed to determine the optimal inclusion level of a protease in the diets of Nile tilapia (Oreochromis niloticus) to enhance growth performance, nutrient utilization and fillet quality. Two experiments were made, one to determine the optimal level and a second experiment to validate these levels of supplementation in diets of tilapias. The first experiment consisted of six treatments, each with six replicates, and 25 fish per experimental unit. The treatments were as follows: crescent levels from 0, 25, 50, 75, 100 and 125 g/t of protease. In the second experiment, the treatments were as follows: (1) Positive Control (PC), meeting all nutritional requirements; (2) Negative Control 50 (CN50), with a 50% reduction based on the Precizyon PRO 50 matrix; (3) Negative Control 100 (CN100), with a 100% reduction; (4) Negative Control 150 (CN150), with a 150% reduction; (5) CN150 supplemented with 50 g/t of Precizyon PRO 50 and (6) CN150 supplemented with 75 g/t of Precizyon PRO 50. After analysing the results, it was observed that the addition of Precizyon PRO 50 to Nile tilapia diets significantly enhanced nutrient digestibility, growth, intestinal structure and fillet quality. Optimal levels of Precizyon PRO 50 were found to be between 71 and 77 g/t. Supplementing diets with 50–75 g/t of Precizyon PRO 50 effectively mitigated performance deficits caused by reduced amino acid levels, thereby improving growth, fillet yields and overall health.

本研究旨在确定尼罗罗非鱼(Oreochromis niloticus)饲料中蛋白酶的最佳添加水平,以提高尼罗罗非鱼的生长性能、营养物质利用率和鱼片品质。本研究进行了两项试验,一项是确定最佳添加水平,另一项是验证罗非鱼饲料中这些添加水平。第一期试验共6个处理,每个处理6个重复,每个试验单元25尾鱼。蛋白酶用量分别为0、25、50、75、100和125 g/t。第2个试验采用以下处理:(1)阳性对照(PC),满足所有营养需求;(2)阴性对照50 (CN50),根据precisizyon PRO 50矩阵减少50%;(3)阴性对照100 (CN100),降低100%;(4)阴性对照150 (CN150),减少150%;(5) CN150添加50 g/t的Precizyon PRO 50, (6) CN150添加75 g/t的Precizyon PRO 50。综上所述,在尼罗罗非鱼饲料中添加preczyon PRO 50可显著提高尼罗罗非鱼营养物质消化率、生长、肠道结构和鱼片品质。优选的preczyon PRO 50水平为71 ~ 77 g/t。在饲粮中添加50 - 75 g/t的preczyon PRO 50可有效缓解氨基酸水平降低造成的生产性能缺陷,从而改善生长、鱼片产量和整体健康状况。
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引用次数: 0
Current Status and Production Trends of Commercially Cultured Mariculture Species Along the Kenyan Coast: Challenges, Opportunities and Future Prospects 肯尼亚沿海商业化海水养殖物种的现状和生产趋势:挑战、机遇和未来展望
IF 1.9 Q3 FISHERIES Pub Date : 2025-09-18 DOI: 10.1002/aff2.70118
Jonathan Munguti, Mavindu Muthoka, Domitila Kyule, Antony Nzioka, Erick Ogello, Esther Wairimu Magondu, Morine Mukami, Mirriam Wainaina

Mariculture holds significant promise for enhancing food security, blue economy development and climate-resilient livelihoods along Kenya's 640 km coastline. This review synthesises over two decades of empirical and grey literature to examine the current status, production trends, challenges and future prospects of commercially cultured mariculture species in Kenya. The review focuses on key species including milkfish (Chanos chanos), rabbitfish (Siganus sutor), seaweed (Eucheuma spp.), mud crab (Scylla serrata), prawns (Penaeus spp.), oysters (Saccostrea cucullata), Artemia franciscana and sea cucumbers (Holothuria scabra). Despite a favourable marine environment and policy recognition, the sector remains underdeveloped, with total production in 2023 reaching only 112 metric tons. Major constraints include limited hatchery capacity, weak technical knowledge, policy and regulatory fragmentation, infrastructural gaps and fragile market linkages. Nonetheless, emerging opportunities are evident: seaweed farming has shown rapid expansion with high female participation; integrated multi-trophic aquaculture (IMTA) offers ecological and economic efficiencies; and strategic investments such as the National Mariculture Resource and Training (NAMARET) Center promise to improve seed and training access. The review identifies the potential for upscaling finfish and shellfish farming, diversifying species portfolios and strengthening mariculture value chains through policy alignment, climate adaptation and blue economy integration. Addressing key constraints through targeted investment, inclusive community participation, and sustainable technologies will be critical to unlocking the sector's growth. This synthesis provides a foundation for policymakers, researchers and stakeholders to develop resilient, inclusive and market-oriented mariculture systems in coastal Kenya.

海水养殖为加强肯尼亚640公里海岸线沿线的粮食安全、蓝色经济发展和气候适应型生计带来了巨大希望。本综述综合了20多年来的实证文献和灰色文献,研究了肯尼亚商业养殖海水养殖物种的现状、生产趋势、挑战和未来前景。重点介绍了目鱼(Chanos Chanos)、兔鱼(Siganus sutor)、海藻(Eucheuma spp.)、泥蟹(Scylla serrata)、对虾(Penaeus spp.)、牡蛎(Saccostrea cucullata)、Artemia franciscana和海参(Holothuria scabra)。尽管有良好的海洋环境和政策认可,但该行业仍然不发达,2023年的总产量仅为112公吨。主要制约因素包括孵化场能力有限、技术知识薄弱、政策和管理分散、基础设施差距和脆弱的市场联系。尽管如此,新出现的机会是显而易见的:海藻养殖在女性参与率较高的情况下迅速扩张;综合多营养水产养殖(IMTA)提供生态和经济效益;国家海水养殖资源和培训(NAMARET)中心等战略投资承诺改善种子和培训机会。该评估确定了通过政策调整、气候适应和蓝色经济一体化来扩大鱼类和贝类养殖规模、使物种组合多样化和加强海水养殖价值链的潜力。通过有针对性的投资、包容性的社区参与和可持续技术来解决关键制约因素,对于释放该行业的增长至关重要。这种综合为决策者、研究人员和利益攸关方在肯尼亚沿海地区发展有弹性、包容和以市场为导向的海水养殖系统提供了基础。
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引用次数: 0
Estimating Reproductive Parameters of a Newly Discovered Weather Loach Population 估计新发现的天气泥鳅种群的繁殖参数
IF 1.9 Q3 FISHERIES Pub Date : 2025-09-12 DOI: 10.1002/aff2.70117
Taylor Faherty, Molly Martin, Michael Baker, Alan Bond, Katherine Fincher, Zachary Schumber, Andrew Lyons, Joseph Dahlen, James L. Shelton, Wesley Gerrin, Sarah McNair, Martin J. Hamel, Peter D. Hazelton

Aquatic invasive species have negative impacts on native biodiversity and pose a significant threat to overall ecosystem health. Successfully established non-native species possess life history traits that are advantageous for colonization and expansion into novel environments. The reproductive traits and strategies of fish are often good predictors of invasion success. Thus, understanding reproductive dynamics of non-native species in their introduced environments is an important component for predicting expansion and effectively managing invasive populations. The Weather Loach Misgurnus anguillicaudatus is a recently discovered introduced species in Georgia, USA, and little is known about its life history attributes where it is not native. Thus, the objectives of this study were to: (1) estimate mean batch fecundity of female Weather Loach; (2) determine timing and periodicity of spawning; and (3) evaluate whether the gonadosomatic index (GSI) is a reliable indicator of reproductive status in this species. Based on observed peaks in eggs larger than 500 µm, we identified the presumed spawning season for Weather Loach to be occurring from April through August. The highest average fecundity observed was during July (10,539 eggs) and the lowest average fecundity observed was during April (3083 eggs). The GSI was a strong predictor of fecundity and tracked the number of mature eggs present in each month of the year. Our estimates of batch fecundity and determination of the annual spawning season can help managers better understand reproductive dynamics and develop predictive population models aimed at evaluating management activities.

水生入侵物种对本地生物多样性产生了负面影响,对整个生态系统的健康构成了重大威胁。成功建立的非本地物种具有有利于殖民和扩展到新环境的生活史特征。鱼类的繁殖特征和策略往往是入侵成功的良好预测指标。因此,了解外来物种在引入环境中的繁殖动态是预测入侵种群扩张和有效管理入侵种群的重要组成部分。天气泥鳅(Misgurnus anguillicaudatus)是最近在美国乔治亚州发现的一种引进物种,人们对它的生活史属性知之甚少。因此,本研究的目的是:(1)估计雌性天气泥鳅的平均批次繁殖力;(2)确定产卵的时间和周期;(3)评价性腺指数(gonadosomatic index, GSI)是否是该物种生殖状态的可靠指标。根据观察到的大于500µm的卵的峰值,我们确定了天气泥鳅的推定产卵季节是从4月到8月。7月平均产卵量最高,为10539枚;4月平均产卵量最低,为3083枚。GSI是生育力的一个强有力的预测指标,并跟踪一年中每个月成熟卵子的数量。我们对分批繁殖力的估计和每年产卵季节的确定可以帮助管理者更好地了解繁殖动态,并开发旨在评估管理活动的预测种群模型。
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引用次数: 0
Comparative Analysis of Growth Performance, Intestinal Enzyme and Body Composition of Common Carp (Cyprinus carpio) Cultured in Different C/N Ratio of Biofloc System 不同碳氮比生物絮团系统中鲤鱼生长性能、肠道酶及体成分的比较分析
IF 1.9 Q3 FISHERIES Pub Date : 2025-09-04 DOI: 10.1002/aff2.70113
Mojtaba Alishahi, M. M. Haghparast, P. Moftakhar

Biofloc technology (BFT), an eco-friendly aquaculture system, was evaluated for its effects on growth performance, digestive physiology, gut microbiota, and carcass quality in juvenile common carp (Cyprinus carpio) using cane molasses as a carbon source at carbon-to-nitrogen (C/N) ratios of 15, 20, and 25. Compared to conventional intensive farming (control), carp reared in BFT systems (over 90 days) exhibited significantly improved growth performance, including weight gain, specific growth rate, and feed conversion ratio, particularly at C/N ratios of 20 and 25. The BFT groups also demonstrated enhanced digestive enzyme and antioxidant activity, higher proportion of beneficial lactic acid bacteria, and improved carcass composition. These findings indicate that BFT using sugarcane molasses at a C/N ratio of 20 offers a sustainable alternative to conventional carp farming. Beyond improving growth performance, BFT positively influenced fish health indicators and carcass quality.

以甘蔗糖蜜为碳源,在碳氮比分别为15、20和25的条件下,研究了生态养殖系统Biofloc技术(BFT)对鲤鱼幼鱼生长性能、消化生理、肠道菌群和胴体品质的影响。与常规集约养殖(对照)相比,在BFT系统中饲养(超过90天)的鲤鱼表现出显著改善的生长性能,包括增重、特定生长率和饲料系数,特别是在碳氮比为20和25时。BFT组的消化酶和抗氧化活性增强,有益乳酸菌比例提高,胴体组成改善。这些研究结果表明,使用碳氮比为20的甘蔗糖蜜的BFT是传统鲤鱼养殖的可持续替代方案。除了提高生长性能外,BFT还对鱼类健康指标和胴体品质产生积极影响。
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Aquaculture, Fish and Fisheries
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