A reliable and cost-effective source of fingerlings is essential for the successful commercial aquaculture of black sea bass. This study aimed to determine the effects of nursery tank stocking densities on the growth performance, feed efficiency, survival, tolerance to shipping, and biochemical quality of juvenile black sea bass. In two experiments, different stocking densities were compared for black sea bass at different stages of development. In Experiment 1, intermediate stage juveniles (1.27 g mean wt) were stocked at densities of 4.5 and 6.5 fish per liter of tank volume. Growth performance and biochemical quality were similar between the two density treatments. In Experiment 2, early post-metamorphic stage juveniles (mean wt. = 0.524 g) were compared using the same stocking densities. While the fish reared at 4.5 fish/L were slightly larger, there were no significant differences in growth performance or biochemical quality between the density treatments. After both experiments, the fingerlings from each density treatment showed high survival rates under acute crowding and simulated shipping conditions. The study demonstrates that high NT densities of 4.5 and 6.5 fish/L did not negatively impact the growth performance and quality of black sea bass fingerlings, providing transport-ready fingerlings in a relatively short period.

中文翻译：

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在试点循环苗圃中高饲养密度饲养的后变态阶段黑鲈Centropristis striata的生长性能、饲料利用率和对急性拥挤的抵抗力

可靠且具有成本效益的鱼种来源对于黑鲈商业化水产养殖的成功至关重要。本研究旨在确定育苗池放养密度对黑鲈幼鱼的生长性能、饲料效率、存活率、运输耐受性和生化质量的影响。在两个实验中，比较了黑鲈在不同发育阶段的不同饲养密度。在实验1中，中期幼鱼（平均重量1.27克）的饲养密度为每升水箱容积4.5和6.5条鱼。两种密度处理之间的生长性能和生化质量相似。在实验 2 中，使用相同的饲养密度对早期变态后阶段幼鱼（平均重量 = 0.524 克）进行了比较。虽然以 4.5 条/L 饲养的鱼稍大一些，密度处理之间的生长性能或生化质量没有显着差异。两次实验后，每种密度处理的鱼种在严重拥挤和模拟运输条件下都表现出较高的存活率。研究表明，4.5 和 6.5 条鱼/升的高 NT 密度不会对黑鲈鱼种的生长性能和质量产生负面影响，从而在相对较短的时间内提供可运输的鱼种。