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The Eel Ascending: The Influence of Lateral Slope, Climbing Substrate and Flow Rate on Eel Pass Performance 鳗鱼上升:侧坡、攀爬基质和流速对鳗鱼通道性能的影响
IF 2.3 3区 农林科学 Q2 FISHERIES Pub Date : 2023-12-18 DOI: 10.3390/fishes8120612
Adam T. Piper, Paula J. Rosewarne, Charlotte Pike, Rosalind M. Wright
Optimising the design of passage facilities to restore fluvial connectivity for juvenile European eel (Anguilla anguilla) is a key priority within conservation efforts for the species, across the majority of its freshwater range. Employing an experimental setup that simulated gravity-fed upstream eel passes, this study demonstrated that novel V-profile passes, which incorporate two lateral slopes (15°), performed better than laterally flat passes over the flow rates tested (0.2–0.6 L s−1). For the small eel size used (60–80 mm length), the bristle substrate consistently outperformed studs, but the lateral slope had a greater effect on passage metrics than the substrate choice. Our findings strongly support the use of V-shaped channels for upstream migrating eel at fish passage facilities, particularly in scenarios where flow rates may be elevated and/or fluctuating, such as for gravity-fed passes.
优化通道设施的设计以恢复欧洲鳗鲡幼鱼的河道连通性,是欧洲鳗鲡这一物种在其大部分淡水区域保护工作的重中之重。本研究采用实验装置模拟重力作用下的上游鳗鱼通道,结果表明,在测试的流速(0.2-0.6 升/秒)范围内,包含两个横向斜坡(15°)的新型 V 型鳗鱼通道比横向扁平通道的性能更好。对于使用的小规格鳗鱼(体长 60-80 毫米),鬃毛基质的性能始终优于螺柱,但横向坡度对通过指标的影响大于基质选择。我们的研究结果有力地支持了在鱼类通道设施中为鳗鱼的上游洄游使用 V 形通道,特别是在流速可能会升高和/或波动的情况下,例如重力式通道。
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引用次数: 0
The Bioeconomic Analysis of Hybrid Giant Grouper (Epinephelus fuscoguttatus × Epinephelus lanceolatus) and Green Grouper (Epinephelus malabaricus): A Case Study in Taiwan 杂交巨石斑鱼(Epinephelus fuscoguttatus × Epinephelus lanceolatus)与绿石斑鱼(Epinephelus malabaricus)的生物经济分析:台湾案例研究
IF 2.3 3区 农林科学 Q2 FISHERIES Pub Date : 2023-12-17 DOI: 10.3390/fishes8120610
Po-Lin Huang, Farok Afero, Yao Chang, Bo-Ying Chen, Hsun-Yu Lan, Yen-Lung Hou, Cheng-Ting Huang
Grouper aquaculture is a rapidly growing and dynamic industry within the Taiwan aquaculture sector that serves as an important source of income generation. Farming fishes at a better location (FFABL) is a promising production strategy. This study evaluated the production and economic performance of grouper farming in Taiwan. This investigation employed two steps: (1) a cost–benefit analysis to determine the main component affecting profitability; and (2) multivariate statistics to clarify the relationship between biological and economic factors. The findings suggest that the best choice of species is hybrid giant grouper that generates and highlights a positive income, viable benefit–cost ratio and profit rate. The study found the feed management of hybrid giant groupers requires more consideration due to its low feed conversion ratio. The producers need to replace trash fish in commercial feed during the production cycle to ensure better feed management. Finally, this paper argues that feed is the main constraint for grouper farming, which is sensitive to any change in feed productivity, and this constraint must be solved to sustain the grouper industry in Taiwan.
石斑鱼养殖是台湾水产养殖业中发展迅速、充满活力的产业,是重要的创收来源。在较佳地点养殖鱼类(FFABL)是一种很有前景的生产策略。本研究评估了台湾石斑鱼养殖的生产和经济效益。这项调查采用了两个步骤:(1) 通过成本效益分析,确定影响利润的主要因素;(2) 通过多元统计,阐明生物因素与经济因素之间的关系。研究结果表明,杂交大石斑鱼是最佳鱼种选择,它能带来并突出正收入、可行的效益成本比和利润率。研究发现,由于杂交大石斑鱼的饲料转化率较低,其饲料管理需要更多考虑。生产者需要在生产周期内用商品饲料替代杂鱼,以确保更好的饲料管理。最后,本文认为饲料是石斑鱼养殖的主要制约因素,对饲料生产率的任何变化都很敏感,要维持台湾石斑鱼产业的发展,必须解决这一制约因素。
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引用次数: 0
Effects of Increased Temperature on Brain and Sensory Development in the Port Jackson Shark (Heterodontus portusjacksoni) 温度升高对杰克逊港鲨鱼(Heterodontus portusjacksoni)大脑和感官发育的影响
IF 2.3 3区 农林科学 Q2 FISHERIES Pub Date : 2023-12-17 DOI: 10.3390/fishes8120611
E. E. Peele, C. Huveneers, Culum Brown, Connor R. Gervais, K. E. Yopak
Morphological differences in the peripheral (sensory) and central (brain) nervous system may confer sensory and/or behavioral variation in elasmobranchs, both across taxa and throughout ontogeny. Over the last century, sea surface temperatures have increased over 0.5 °C and are predicted to rise 1–4 °C by the year 2100, potentially affecting species’ physiological performance negatively. As the nervous system of fishes grows continually throughout their lives, it may be highly plastic in response to environmental changes. This study examined the effects of increased rearing temperature on nervous system development in Port Jackson sharks (Heterodontus portusjacksoni). Egg cases (n = 21) were collected from Gulf St. Vincent (Adelaide, SA) and placed into either ambient (17.6 °C) or 3 °C above ambient seawater conditions through hatching and reared for up to five months post-hatch. Relative volumes of the eyes and nose (olfactory rosette) were quantified using magnetic resonance imaging, and relative brain size and size of major brain regions were compared between the two treatment groups. The size of the olfactory bulbs and tegmentum varied significantly between the treatment groups, which suggest differences in primary, secondary, or tertiary sensory processing and/or motor functions at elevated temperatures. While studies on acute responses to environmental conditions cannot inform true adaptation across broad timescales, understanding the effects of increased temperature on the brain phenotype can aid in predicting how elasmobranchs may fare in response to changing ocean conditions.
外周(感觉)和中枢(大脑)神经系统的形态差异可能会导致鞘鳃亚纲动物在感觉和/或行为上的变异,这种变异既存在于不同类群之间,也存在于整个个体发育过程中。在过去的一个世纪中,海面温度上升了0.5 °C以上,预计到2100年将上升1-4 °C,这可能会对物种的生理表现产生负面影响。由于鱼类的神经系统在其一生中不断成长,因此在应对环境变化时可能具有很强的可塑性。本研究考察了饲养温度升高对杰克逊港鲨鱼(Heterodontus portusjacksoni)神经系统发育的影响。从圣文森特湾(南澳大利亚州阿德莱德市)收集的卵箱(n = 21)在孵化过程中被置于环境温度(17.6 °C)或高于环境温度 3 °C 的海水条件下,并在孵化后饲养长达五个月。利用磁共振成像对眼睛和鼻子(嗅栅)的相对体积进行了量化,并比较了两个处理组之间大脑的相对大小和主要脑区的大小。不同处理组的嗅球和脑桥的大小差异显著,这表明在高温条件下,初级、二级或三级感觉处理和/或运动功能存在差异。虽然对环境条件急性反应的研究无法为大时间尺度的真正适应提供信息,但了解温度升高对大脑表型的影响有助于预测鞘鳃亚纲动物如何应对不断变化的海洋条件。
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引用次数: 0
Effects of Recombinant Leptin Proteins on the Expression of Key Genes in the HPG Axis and Liver of Tongue Sole In Vitro 重组瘦素蛋白对体外舌鳎 HPG 轴和肝脏关键基因表达的影响
IF 2.3 3区 农林科学 Q2 FISHERIES Pub Date : 2023-12-16 DOI: 10.3390/fishes8120608
Xin Cai, Yaxing Zhang, Bin Wang, Aijun Cui, Yan Jiang, Zhaojun Meng, Yuting Li, Yongjiang Xu
Leptin (Lep) plays a crucial role in controlling food intake and maintaining energy balance in mammals. While several studies have shown the presence of multiple leptin genes in teleosts, limited information is currently available on how sex steroid hormones regulate the expression of these genes in fish. In this study, we used two previously expressed and purified leptin proteins to incubate four tissues in vitro (hypothalamic-pituitary-gonadal axis and liver) and used the RT-qPCR method to detect the expression of genes related to growth and reproduction in tongue sole (Cynoglossus semilaevis). The results showed that both recombinant LepA and LepB proteins of tongue sole almost entirely suppressed the expression of genes related to growth and reproduction in the hypothalamic-pituitary-gonadal axis and liver, while LepB may have had a positive role on steroid synthesis in gonads. Further, a high concentration of LepA facilitated the expression of IGF-Ι in liver. At the same time, we utilized human leptin to incubate four tissues in vitro; although most of them had trends similar to those stimulated with tongue sole leptins, there were still some differences, indicating differences among leptin homologs between humans and fishes. To our knowledge, this is the first study to explore the function of tongue sole LepA and LepB within the hypothalamic-pituitary-gonadal axis and liver in vitro. Our results provide a valuable resource and foundation for future studies.
瘦素(Lep)在哺乳动物控制食物摄入量和维持能量平衡方面发挥着至关重要的作用。虽然多项研究表明远洋鱼类体内存在多个瘦素基因,但目前关于性类固醇激素如何调节这些基因在鱼类体内表达的信息十分有限。在本研究中,我们利用两种先前表达和纯化的瘦素蛋白对四种组织(下丘脑-垂体-性腺轴和肝脏)进行体外培养,并使用 RT-qPCR 方法检测舌鳎(Cynoglossus semilaevis)生长和繁殖相关基因的表达。结果表明,舌鳎的重组 LepA 和 LepB 蛋白几乎完全抑制了下丘脑-垂体-性腺轴和肝脏中与生长和繁殖有关的基因的表达,而 LepB 可能对性腺中类固醇的合成有积极作用。此外,高浓度的 LepA 能促进肝脏中 IGF-Ι 的表达。同时,我们利用人体瘦素对四种组织进行了体外培养,虽然大多数组织与舌鳎瘦素的刺激趋势相似,但仍存在一些差异,这表明人与鱼类的瘦素同源物之间存在差异。据我们所知,这是首次在体外探讨舌鳎瘦素 LepA 和 LepB 在下丘脑-垂体-性腺轴和肝脏中的功能。我们的研究结果为今后的研究提供了宝贵的资源和基础。
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引用次数: 0
Influence of Turbidity on Foraging Behaviour in Three-Spined Sticklebacks (Gasterosteus aculeatus) 浊度对三刺icklebacks(Gasterosteus aculeatus)觅食行为的影响
IF 2.3 3区 农林科学 Q2 FISHERIES Pub Date : 2023-12-16 DOI: 10.3390/fishes8120609
Lasse Lange Jensen, Thomas Bjørn, Andreas Hein Korsgaard, C. Pertoldi, Niels Madsen
Anthropogenic activities increase turbidity in coastal marine environments globally, and turbidity is particularly caused by eutrophication. Turbidity is a measurement of the scattering and absorption of light by suspended matter in water. An increase in turbidity influences visual predators and affects community structures and whole ecosystems. The three-spined stickleback (Gasterosteus aculeatus) is a widespread species in the northern hemispheric Pacific and Atlantic oceans. It is a visual predator and, therefore, a very well-suited species for studying the effects of increasing turbidity on foraging behaviour and activity. Sticklebacks used for this study were from an aquarium in the North Sea Oceanarium. They have been in the aquarium for around two months and were originally collected in a highly eutrophicated marine fjord system. They were individually placed in an observation aquarium, fed with krill, given 10 min to forage, and observed by video cameras. The video films were analysed to study stickleback predation behaviour. Experiments were repeated with four different turbidity treatments, ranging from a mean of 0.034 up to 10 NTU (nephelometric turbidity unit). Bentonite clay was used as a turbidity-increasing substance. A statistically significant difference in foraging behaviour and activity between the turbidity treatments was observed. The test subjects were found to lunge less for prey and had a higher feeding latency with increasing turbidity. Additionally, they were less active with increasing turbidity. The behavioural instability estimated as a variation in feeding latency increased with increasing turbidity but decreased at the highest turbidity value. Our study indicates an effect of turbidity-increasing events on the behaviour of the three-spined stickleback and potentially also other similar visual predators.
人类活动增加了全球沿海海洋环境的浑浊度,富营养化尤其是造成浑浊的原因。浊度是水中悬浮物对光的散射和吸收的测量值。浑浊度的增加会影响视觉捕食者,并影响群落结构和整个生态系统。三刺粘背鱼(Gasterosteus aculeatus)是北半球太平洋和大西洋的广布物种。它是一种视觉捕食者,因此非常适合研究浑浊度增加对觅食行为和活动的影响。本研究使用的棒背鱼来自北海海洋馆的一个水族箱。它们已在水族箱中生活了约两个月,最初是在一个高度富营养化的海洋峡湾系统中采集的。它们被单独放在一个观察水族箱中,喂食磷虾,给它们 10 分钟时间觅食,并用摄像机观察。通过对录像进行分析,研究棍棒鱼的捕食行为。实验重复了四种不同的浊度处理方法,平均浊度从 0.034 到 10 NTU(浊度单位)不等。膨润土被用作增加浊度的物质。在浊度处理之间,观察到觅食行为和活动有明显的统计学差异。随着浊度的增加,试验对象对猎物的扑咬次数减少,进食潜伏期延长。此外,随着浊度的增加,它们的活动量也减少了。根据摄食潜伏期变化估算的行为不稳定性随着浊度的增加而增加,但在最高浊度值时有所降低。我们的研究表明,浊度增加的事件会影响三刺鱼的行为,也可能会影响其它类似的视觉捕食者。
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引用次数: 0
Chitinase and Insect Meal in Aquaculture Nutrition: A Comprehensive Overview of the Latest Achievements 水产养殖营养中的几丁质酶和昆虫餐:最新成果综述
IF 2.3 3区 农林科学 Q2 FISHERIES Pub Date : 2023-12-14 DOI: 10.3390/fishes8120607
Imam Hasan, Francesco Gai, Simona Cirrincione, S. Rimoldi, Giulio Saroglia, G. Terova
The aquaculture industry is looking for sustainable alternatives to conventional fish meals in fish feed, and insect-based meals are proving to be a promising solution. These meals are nutritionally optimal as they have a high protein content and an ideal amino acid profile. However, the presence of chitin, a component of the insect exoskeleton in these meals presents both an opportunity and a challenge. Chitosan, a derivative of chitin, is known to improve the physiological functions of fish, including growth, immunity, and disease resistance. While chitin and its derivative chitosan offer several physiological benefits, their presence can affect the digestibility of feed in some fish species, making the inclusion of insect-based meals in aquafeeds complex. While studies suggest positive effects, some problems, such as reduced growth rates in certain species, emphasize the need for further research on chitin digestion in fish. Chitinase, an enzyme that breaks down chitin, is being investigated as a potential solution to improve the nutritional value of insect meals in aquafeed. This review provides a comprehensive analysis of the applications, benefits, and challenges of using chitinase in aquaculture, highlighting the enzyme’s role in improving feed digestibility, disease control, and environmental sustainability. Extensive research is required to fully understand the potential of chitinase enzymes in aquaculture and to optimize their applications in this dynamic field. Overall, this review provides insight into the evolving landscape of insect-based meals and the applications of chitinase enzymes within sustainable aquaculture practices.
水产养殖业正在寻找鱼饲料中传统鱼粉的可持续替代品,而以昆虫为基础的鱼粉被证明是一种很有前景的解决方案。这些饲料具有高蛋白含量和理想的氨基酸谱,营养价值极高。然而,这些饲料中含有昆虫外骨骼成分甲壳素,这既是机遇也是挑战。众所周知,甲壳素的衍生物甲壳素可改善鱼类的生理功能,包括生长、免疫和抗病能力。虽然甲壳素及其衍生物壳聚糖具有多种生理益处,但它们的存在会影响某些鱼类对饲料的消化率,这使得在水产饲料中添加昆虫饲料变得复杂。虽然研究表明会产生积极影响,但也存在一些问题,如某些鱼类的生长率降低,这就强调了进一步研究鱼类消化甲壳素的必要性。几丁质酶是一种能分解几丁质的酶,目前正在作为一种潜在的解决方案进行研究,以提高水产饲料中昆虫饲料的营养价值。这篇综述全面分析了在水产养殖中使用几丁质酶的应用、益处和挑战,强调了这种酶在提高饲料消化率、疾病控制和环境可持续性方面的作用。要充分了解几丁质酶在水产养殖中的潜力并优化其在这一动态领域的应用,还需要进行广泛的研究。总之,这篇综述深入介绍了昆虫饲料不断演变的情况以及几丁质酶在可持续水产养殖实践中的应用。
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引用次数: 0
Evaluation Performance of Three Standardization Models to Estimate Catch-per-Unit-Effort: A Case Study on Pacific Sardine (Sardinops sagax) in the Northwest Pacific Ocean 估算单位努力量渔获量的三种标准化模型的评估性能:西北太平洋太平洋沙丁鱼(Sardinops sagax)案例研究
IF 2.3 3区 农林科学 Q2 FISHERIES Pub Date : 2023-12-11 DOI: 10.3390/fishes8120606
Yongchuang Shi, Haibin Han, Fenghua Tang, Shengmao Zhang, Wei Fan, Heng Zhang, Zuli Wu
Catch-per-unit-effort (CPUE) standardization in fisheries is a critical foundation for conducting stock assessment and fishery conservation. The Pacific sardine (Sardinops sagax) is one of the economically important fish species in the Northwest Pacific Ocean (NPO). Hence, the importance of choosing an appropriate CPUE standardization model cannot be overstated when it comes to achieving a precise relative abundance index for the efficient management of Pacific sardine fishery. This study’s main aim was to assess and compare the efficacy of three models, specifically the General Linear Model (GLM), the Generalized Linear Mixed Model (GLMM), and the spatio-temporal GLMM (VAST), in the CPUE standardization for Pacific sardine fishery in the NPO, with the ultimate goal of identifying the most appropriate model. An influence analysis was applied to analyze the impact of individual variables on the disparity among standardized and nominal CPUE, and the main explanatory variables influencing standardized CPUE were identified. A coefficient–distribution–influence (CDI) plot was generated to analyze the impact of the different models on the annual standardized CPUE. Additionally, a simulation testing framework was developed to evaluate the estimated accuracy of the three models. The results indicated that the standardized CPUE and the nominal CPUE exhibited similar trends between 2014 and 2021 for the three models. Compared to the GLM and the GLMM, the VAST demonstrates larger conditional R2 and smaller conditional AIC, indicating a better performance in standardizing the CPUE for Pacific sardines due to its consideration of spatial and temporal variations. The interaction terms within the three models exert significant influences on the annual standardized CPUE, necessitating their inclusion in the model construction. CDI plots indicate that the spatio-temporal influence of the VAST model exhibits a smaller variation trend, suggesting that the VAST is more robust when standardizing the CPUE for Pacific sardines. Simulation testing additionally demonstrated that the VAST model displays smaller model root mean squared error (RMSE) and bias, establishing it as the superior performer for standardizing CPUE. Our results provide a theoretical basis for the scientific management of Pacific sardines in the NPO and can be extended to CPUE standardization for other small pelagic fish species worldwide.
渔业单位渔获量(CPUE)标准化是进行种群评估和渔业保护的重要基础。太平洋沙丁鱼(Sardinops sagax)是西北太平洋(NPO)的重要经济鱼类之一。因此,选择合适的 CPUE 标准化模型对于获得精确的相对丰度指数以有效管理太平洋沙丁鱼渔业的重要性怎么强调都不为过。本研究的主要目的是评估和比较三种模型,特别是一般线性模型(GLM)、广义线性混 合模型(GLMM)和时空 GLMM(VAST)在 NPO 太平洋沙丁鱼渔场 CPUE 标准化中的功效,最终目标是确定最合适的模型。应用影响分析方法分析了各个变量对标准化和名义 CPUE 差异的影响,并确定了影响标准化 CPUE 的主要解释变量。生成了系数-分布-影响(CDI)图,以分析不同模型对年度标准化 CPUE 的影响。此外,还建立了一个模拟测试框架,以评估三个模型的估计精度。结果表明,在 2014 年至 2021 年期间,三种模型的标准化 CPUE 和名义 CPUE 呈现出相似的趋势。与 GLM 和 GLMM 相比,VAST 的条件 R2 更大,条件 AIC 更小,表明其考虑了时空变化,在太平洋沙丁鱼 CPUE 标准化方面表现更好。三个模型中的交互项对年标准化 CPUE 有显著影响,因此有必要将其纳入模型构建中。CDI 图显示,VAST 模型的时空影响变化趋势较小,表明 VAST 在标准化太平洋沙丁鱼 CPUE 时更为稳健。此外,模拟测试表明,VAST 模型的均方根误差(RMSE)和偏差较小,在标准化 CPUE 方面表现更优。我们的研究结果为北大西洋渔业组织对太平洋沙丁鱼的科学管理提供了理论依据,并可推广到全球其他小型中上层鱼类的 CPUE 标准化中。
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引用次数: 0
The Early Allometric Growth and Osteological Ontogeny of Pot-Bellied Seahorse (Hippocampus abdominalis, L. 1827) under Mass-Scale Captive Breeding Conditions in North China 华北大规模人工繁殖条件下壶腹海马的早期异速生长和骨骼发育特征
IF 2.3 3区 农林科学 Q2 FISHERIES Pub Date : 2023-12-08 DOI: 10.3390/fishes8120604
Xuehui Shi, Xinyi Tang, Yichao Zhang, Wenqi Wang, Siyong Qin, Qinghua Liu, Jie Mei
Seahorses are valuable species for their use in traditional Chinese medicine, as well as for the aquarium trade as ornamentals and curiosities. To balance market demand and reduce pressure on wild populations, many countries have undertaken commercial seahorse cultivation. Skeletal development plays a crucial role in fish fry culture, affecting external morphology, feeding, and movement. This study investigated the ontogeny allometry, timing, and progression of skeletal development in H. abdominalis from DAB (day after birth) 1 to DAB 100 under mass-scale captive breeding conditions in north China. The results of this study revealed the growth rate was significantly increased between DAB 30 and DAB 54. Allometry analysis revealed that in the early stage, the head, trunk, and tail demonstrated almost isometric growth. However, in the later stage, the head and trunk exhibited negative isometric growth, whereas the tail displayed positive isometric growth. Skeletal staining results showed that newborn seahorses do not have ossified bones until DAB 11 (SL 28.14 ± 2.94 mm). Ossification was primarily observed in the jaw region and the tubular nasal structure of the cranium, which indicated the importance of the early development of feeding organs. The initial formation of ossified vertebral columns was observed at DAB 13 (SL 26.48 ± 0.63 mm), with the complete ossification of all vertebrae occurring by DAB 45 (SL 54.87 ± 4.70 mm). Furthermore, the cranium, rings, and plates were all fully ossified by DAB 30. Ossification of the fins began at DAB 23 (SL 31.27 ± 4.05 mm). However, neither of them were fully ossified by DAB 100. The pelvic fin and the complete structure of the caudal fin were not observed, possibly because of caudal fin ray structure degeneration within the pouch. In addition, no skeletal deformities were observed in all the tested samples. The results of this study provide valuable information on the developmental biology of H. abdominalis, enriching our understanding of their growth and offering insights for optimizing fish fry breeding technologies.
海马是珍贵的物种,可用于传统中药,也可作为观赏品和奇珍异宝用于水族馆贸易。为了平衡市场需求,减少对野生种群的压力,许多国家都开展了商业海马养殖。骨骼发育在鱼苗养殖中起着至关重要的作用,影响着外部形态、摄食和运动。本研究调查了华北地区大规模人工繁殖条件下海马从出生后第1天(DAB)到第100天(DAB)的骨骼发育过程。研究结果表明,腹黑鱼在出生后第30天至第54天的生长速度明显加快。异体生长分析表明,在早期阶段,头部、躯干和尾部几乎呈等距生长。但在后期,头部和躯干呈现负等距生长,而尾部则呈现正等距生长。骨骼染色结果表明,新生海马在第 11 个 DAB 期(SL 28.14 ± 2.94 mm)前骨骼尚未骨化。骨化主要出现在下颌区域和头颅的管状鼻结构,这表明摄食器官的早期发育非常重要。在第 13 个 DAB 日(SL 26.48 ± 0.63 mm)观察到骨化椎柱的初步形成,到第 45 个 DAB 日(SL 54.87 ± 4.70 mm)所有椎骨完全骨化。此外,到第 30 个 DAB 日,颅骨、骨环和骨板均已完全骨化。鳍的骨化始于 DAB 23(SL 31.27 ± 4.05 mm)。然而,到第 100 个 DAB 日,它们都没有完全骨化。没有观察到骨盆鳍和尾鳍的完整结构,可能是因为尾鳍射线结构在袋内退化。此外,所有检测样本均未发现骨骼畸形。这项研究结果为腹黑鱼的发育生物学提供了宝贵的信息,丰富了我们对其生长的了解,并为优化鱼苗培育技术提供了启示。
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引用次数: 0
The Effects of Vibration Frequency on Oxidative Stress, Digestive Enzymes and ATPases of Crimson Snapper (Lutjanus erythropterus) Fry during Transport 振动频率对绯鲵鱼苗运输过程中氧化应激、消化酶和 ATP 酶的影响
IF 2.3 3区 农林科学 Q2 FISHERIES Pub Date : 2023-12-08 DOI: 10.3390/fishes8120603
Jiayang Li, Yu Guo, Xinye Zhao, Shengjie Zhou, Zhenhua Ma, Gang Yu, C. Qin, Xingqiang Wang
In this study, we sought to characterize the effect of water vibration frequency stress on crimson snapper (Lutjanus erythropterus) survival to determine an optimal transportation speed. To achieve this, we used a transport tank (25 cm × 17 cm × 16 cm) to simulate the transport process. After 8 h at five different vibration frequencies (D1 = 75 rpm, D2 = 105 rpm, D3 = 135 rpm, D4 = 165 rpm, and D5 = 195 rpm), the pH and dissolved oxygen (DO) levels in the tanks decreased; ammonia nitrogen levels (NH4-N) and temperature (T) increased with increasing density; and significant changes in oxidative stress biomarkers, digestive enzymes, and ATPase levels were observed in crimson snapper fry. The enzyme activity increased and reached the maximum value at 195 rpm. The experimental results suggested that during the actual transport, when using transport tanks, the length of the transport time was less than 8 h, and setting the vibration frequency for transportation at 135 rpm was more appropriate, that is, a speed of 50 km/h for transporting crimson snapper fry.
在本研究中,我们试图表征水振动频率应力对红鲷鱼(Lutjanus erythropterus)存活的影响,以确定最佳运输速度。为了实现这一目标,我们使用了一个运输罐(25厘米× 17厘米× 16厘米)来模拟运输过程。5种不同振动频率(D1 = 75 rpm, D2 = 105 rpm, D3 = 135 rpm, D4 = 165 rpm, D5 = 195 rpm)下8 h后,池内pH值和溶解氧(DO)水平下降;氨氮水平(NH4-N)和温度(T)随密度的增加而升高;氧化应激生物标志物、消化酶和atp酶水平在红鲷鱼鱼苗中观察到显著变化。酶活性增加,在195 rpm时达到最大值。实验结果表明,在实际运输过程中,使用运输槽时,运输时间长度应小于8 h,将运输振动频率设置为135 rpm较为合适,即运输红鲷鱼鱼苗的速度为50 km/h。
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引用次数: 0
Correction: Xu et al. Effects of Replacing Dietary Fish Meal by Soybean Meal Co-Fermented Using Bacillus subtilis and Enterococcus faecium on Serum Antioxidant Indices and Gut Microbiota of Crucian Carp Carassius auratus. Fishes 2022, 7, 54 更正:用枯草芽孢杆菌和粪肠球菌共同发酵的豆粕替代鱼粉对鲫鱼血清抗氧化指标和肠道微生物群的影响。Fishes 2022, 7, 54
IF 2.3 3区 农林科学 Q2 FISHERIES Pub Date : 2023-12-07 DOI: 10.3390/fishes8120601
Qian Xu, Zheng Yang, Siyu Chen, Wenjuan Zhu, Siyuan Xiao, Jing Liu, Hongquan Wang, Shile Lan
In the original publication [...]
在原出版物中[…]
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引用次数: 0
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Fishes
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