Georgina Fazekas, Jenő Káldy, Gyula Kovács, Tamás Müller, Uroš Ljubobratović
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The fish biomass gain was significantly higher in each group of higher stocking densities (0.2 ± 0.0 g L<sup>−1</sup>; 0.4 ± 0.0 g L<sup>−1</sup> and 0.8 ± 0.1 g L<sup>−1</sup> respectively, <i>r</i> = .990, <i>p</i> < .001). The L group showed a tendency towards better growth during the first 3 weeks, however, at the end of the trial, no significant differences were observed. The highest mortality at the start of exogenous feeding was noticed in group H (12.77% ± 1.3%) and was significantly different from the two lower density groups (5.16% ± 1.3% in L, 7.94% ± 1.3% in M), however, the overall mortality at the end of the trial did not differ among groups. Results on both growth and mortality during the later periods are suggesting the adaptability of sterlet larvae to the more intensive rearing conditions. Thus, it can be stated that the application of a stocking density of 20 larvae L<sup>−1</sup> is appropriate in the initial period of larval rearing in the sterlet.</p>","PeriodicalId":14894,"journal":{"name":"Journal of Applied Ichthyology","volume":null,"pages":null},"PeriodicalIF":0.7000,"publicationDate":"2022-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jai.14341","citationCount":"0","resultStr":"{\"title\":\"The effect of stocking density on sterlet Acipenser ruthenus (Linnaeus, 1758) larvae in the recirculating aquaculture system\",\"authors\":\"Georgina Fazekas, Jenő Káldy, Gyula Kovács, Tamás Müller, Uroš Ljubobratović\",\"doi\":\"10.1111/jai.14341\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Increasing the number of fish stocked might optimize the efficiency of intensive aquaculture systems however at the same time might have a negative impact on fish welfare and growth parameters. 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引用次数: 0
摘要
增加鱼类放养数量可以优化集约化养殖系统的效率,但同时可能对鱼类福利和生长参数产生负面影响。本研究在30 d的试验中,在重复的试验池中评估了3种不同的放养密度,以研究不同放养密度对小鲟幼虫从孵化到断奶结束的存活和生长的影响。低(L)、中(M)和高(H)密度组的试验密度分别为5、10和20只幼虫L−1。将新孵化的幼虫(1250、2500、5000只/重复箱)分为3个处理组,分别放在250 L的回旋式幼虫饲养箱中。高放养密度组鱼生物量增重显著高于高放养密度组(0.2±0.0 g L−1);0.4±0.0 g L−1和0.8±0.1 g L−1,r = .990, p & lt;措施)。L组在前3周表现出更好的生长趋势,然而,在试验结束时,没有观察到显著差异。H组外源饲养开始时死亡率最高(12.77%±1.3%),与低密度组(L组5.16%±1.3%,M组7.94%±1.3%)差异显著,但试验结束时各组总死亡率无显著差异。后期的生长和死亡结果表明,幼鱼幼虫对更密集的饲养条件具有适应性。综上所述,在幼鱼养殖初期,采用20只L−1的放养密度较为适宜。
The effect of stocking density on sterlet Acipenser ruthenus (Linnaeus, 1758) larvae in the recirculating aquaculture system
Increasing the number of fish stocked might optimize the efficiency of intensive aquaculture systems however at the same time might have a negative impact on fish welfare and growth parameters. In the current study, three different stocking densities were evaluated in duplicated tanks to investigate the effect of different stocking densities on the survival and growth of sterlet larvae from hatching until the end of weaning, during the 30-day trial. Tested densities were 5, 10, and 20 larvae L−1 in the low (L), medium (M), and high (H) density group, respectively. Freshly hatched larvae (1250, 2500, 5000 larvae per duplicated tanks) were divided into three treatment groups in 250 L raceway larval rearing tanks. The fish biomass gain was significantly higher in each group of higher stocking densities (0.2 ± 0.0 g L−1; 0.4 ± 0.0 g L−1 and 0.8 ± 0.1 g L−1 respectively, r = .990, p < .001). The L group showed a tendency towards better growth during the first 3 weeks, however, at the end of the trial, no significant differences were observed. The highest mortality at the start of exogenous feeding was noticed in group H (12.77% ± 1.3%) and was significantly different from the two lower density groups (5.16% ± 1.3% in L, 7.94% ± 1.3% in M), however, the overall mortality at the end of the trial did not differ among groups. Results on both growth and mortality during the later periods are suggesting the adaptability of sterlet larvae to the more intensive rearing conditions. Thus, it can be stated that the application of a stocking density of 20 larvae L−1 is appropriate in the initial period of larval rearing in the sterlet.
期刊介绍:
The Journal of Applied Ichthyology publishes articles of international repute on ichthyology, aquaculture, and marine fisheries; ichthyopathology and ichthyoimmunology; environmental toxicology using fishes as test organisms; basic research on fishery management; and aspects of integrated coastal zone management in relation to fisheries and aquaculture. Emphasis is placed on the application of scientific research findings, while special consideration is given to ichthyological problems occurring in developing countries. Article formats include original articles, review articles, short communications and technical reports.