Abstract The present study was aimed to evaluate the effects of different levels of salinity on water quality, growth performance, survival rate and body composition of Pacific white shrimp in a heterotrophic/ biofloc technology (BFT). Shrimp post-larvae with an average weight of 74.46 mg were cultured in 300 L fiberglass tanks containing 130 L water at a density of 1 post-larva/L. Three treatments including different levels of salinity of 8, 21 and 32 ppt with three replicates were considered. The highest levels of body weight, growth rate, specific growth rate, increase in body length and survival rate were observed at high salinity level (32 ppt). The highest feed conversion ratio (FCR) and the lowest level of feed efficiency were obtained in shrimps cultured at lowest salinity level (P<0.05). Biochemical analysis of shrimp body composition showed an increase in protein, lipid and ash content as the salinity was elevated (P<0.05). The zero-water exchange system used in this study had no significant effects on water quality parameters. The results of the present study concluded that high salinity level (32 ppt) improves the growth and survival of the biofloc supplemented Pacific white shrimp in a BFT system.

中文翻译：

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不同盐度水平对在零水交换异养系统中养殖的南美白对虾（Litopenaeus vannamei Boone，1931）水质、生长性能和身体成分的影响

摘要 本研究旨在通过异养/生物絮凝技术（BFT）评估不同盐度对太平洋白虾水质、生长性能、存活率和身体成分的影响。将平均重量为 74.46 mg 的虾后期幼虫在 300 L 玻璃纤维罐中培养，其中包含 130 L 水，密度为 1 个后期幼虫/L。考虑了三种处理，包括 8、21 和 32 ppt 的不同盐度水平，三个重复。在高盐度水平（32 ppt）下观察到最高水平的体重、生长速率、比生长速率、体长增加和存活率。在最低盐度水平养殖的虾中获得最高饲料转化率（FCR）和最低饲料效率水平（P<0.05）。虾体成分的生化分析表明，随着盐度的升高，蛋白质、脂质和灰分含量增加（P<0.05）。本研究中使用的零水交换系统对水质参数没有显着影响。本研究的结果得出结论，高盐度水平 (32 ppt) 可改善 BFT 系统中添加生物絮团的太平洋白虾的生长和存活。