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首页> 外文期刊>African Journal of Agricultural Research >Effects of stocking density on growth and feed utilization of grouper (Epinephelus coioides) reared in recirculation and flow-through water system
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Effects of stocking density on growth and feed utilization of grouper (Epinephelus coioides) reared in recirculation and flow-through water system

机译：放养密度对循环水和流通水系统中石斑鱼（Epinephelus coioides）生长和饲料利用率的影响

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摘要

Stocking density is well known as an important field in aquaculture. Although many studies on stocking density have been conducted, however effects of rearing grouper (Epinephelus coioides) with different densities in recirculation and flow-through system are not well known. In this study, grouper juveniles (14.22 ± 0.67 g) were reared into 100-L aquaria at 15, 20 and 25 fish/aquaria and cultivated for 70 days. Statistical analyses showed that the highest growth performances observed in group reared at high densities (25 fish/aquaria) in recirculation system (R25), with an average final body weight and length were 95.82 ± 4.24 g and 18.72 ± 1.40 cm, respectively. Significant increase in weight gain and specific growth rate and decrease in food conversion ratio were observed in R25 after 10 weeks. However, no statistically significant different was found in survival rate and condition factor in all treatments. This study found that the effects of stocking density on growth and feeding ratio were higher in recirculation system compared with flow-through system. Further analysis determined that high stocking density in recirculation system and medium density in flow-through could affect the growth, feeding and fish behavior of this species.
机译：放养密度是水产养殖的重要领域。尽管已经进行了许多关于放养密度的研究，但是在再循环和流通系统中养育不同密度的石斑鱼（石斑鱼）的效果还不为人所知。在这项研究中，将石斑鱼幼鱼（14.22±0.67克）以15、20和25条鱼/水族箱饲养到100升水族箱中，并培育70天。统计分析表明，在高密度（25条鱼/水族箱）的循环系统（R25）中饲养的组中观察到最高的生长性能，平均最终体重和长度分别为95.82±4.24 g和18.72±1.40 cm。 10周后，在R25中观察到体重增加和比生长率的显着增加以及食物转化率的降低。然而，在所有治疗中，存活率和条件因素均无统计学差异。本研究发现，与流通系统相比，再循环系统中放养密度对生长和进料比的影响更高。进一步的分析确定再循环系统中较高的放养密度和流通中的中等密度可能影响该物种的生长，摄食和鱼类行为。

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