Influence of salinity on growth and survival of juvenile Sardinella brasiliensis

Pub Date : 2023-05-06 DOI:10.20950/1678-2305/bip.2023.49.e808

M. S. Owatari, C. Magnotti, João Henrique Vargas, Cristina Vaz Avelar De Carvalho, F. Sterzelecki, V. Cerqueira

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Abstract

The aim of the study was to evaluate the influence of changes in seawater salinity on juvenile Brazilian sardine (Sardinella brasiliensis). Through two assays, the LC50 (96 h) and the zootechnical performance (42 days) were determined, respectively. In the first assay, six treatments of salinity 0, 7, 14, 21, 28 and 35 parts per thousand (ppt) with three replicates were established. For this, 100-L cylinder-conical tanks were used, with 30 individuals with 45-day after eclosion (DAE) per unit, without water renewal and feeding. In the groups of salinity 0 and 7 ppt, all fish died on the first day. The LC50 was estimated at salinity 11.13 ppt. The second trial was designed with five treatments (salinity 7, 14, 21, 28 and 35 ppt), with three replicates. Two thousand-L cylindrical-conical tanks were used, with 30 individuals (58 DAE) per unit, with water renewal and feeding until apparent satiation. In the treatment salinity 7 ppt, all fish died by the second day. At salinity 35 ppt, the highest growth rates (2.78 g) and survival (100%) were observed. Salinity 14 ppt had the lowest survival (83%) and growth (1.48 g). We concluded that the juvenile sardines can be adapted to environments with salinity from 14 ppt, with significant losses. However, salinity 35 ppt showed the highest survival and growth rates.

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盐度对巴西沙丁鱼幼鱼生长和存活的影响

本研究的目的是评估海水盐度变化对巴西沙丁鱼幼鱼的影响。通过两种方法分别测定LC50 (96 h)和动物技术性能(42 d)。在第一次试验中，建立了盐度为0、7、14、21、28和35 ppm (ppt)的6个处理，3个重复。采用100 l圆柱-圆锥形水箱，每箱30只，每箱45 d，不换水、不喂食。盐度0和7 ppt组，第一天鱼全部死亡。LC50在盐度11.13 ppt时估计。第二个试验设计5个处理(盐度7、14、21、28和35 ppt)， 3个重复。使用2000升圆柱-圆锥形水箱，每单位30只(58只)，不断补水，直至明显饱足。在盐度为7 ppt的处理下，第2天鱼全部死亡。盐度35 ppt时，生长速率最高(2.78 g)，成活率最高(100%)。盐度为14 ppt时，幼鱼的存活率最低(83%)，生长量最低(1.48 g)。结果表明，幼鱼可以适应盐度为14 ppt的环境，但损失明显。盐度为35 ppt时，成活率和生长率最高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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