盐度和温度对褐菖鲉初孵仔鱼耐饥饿能力的影响

Effects of salinity and temperature on starvation tolerance newly hatched larvae Sebastiscus marmoratus

摘要:

以褐菖鲉(Sebastiscus marmoratus)初孵仔鱼为研究对象,研究了3种水温(12、16、20 ℃)条件下,不同梯度盐度 (5.0、7.5、10.0、15.0、20.0、25.0、30.0、35.0)对褐菖鲉初孵仔鱼不投饵存活指数(SAI)的影响。试验结果显示,在相同水温条件下,水体盐度对褐菖鲉初孵仔鱼的SAI影响显著,并且随着盐度的增加,SAI值呈现先升高后降低的变化趋势,3种温度组均在盐度为25.0时SAI达到最大,且均显著大于盐度5.0、7.5、10.0、15.0和35.0组(P＜0.05)；在相同盐度条件下,随着水温的升高,褐菖鲉初孵仔鱼的SAI值逐渐降低,水温为12 ℃时SAI值最大,均显著大于水温16 ℃和20 ℃组(P＜0.05)。结果表明,在水温为12 ℃、盐度为25.0的条件下,褐菖鲉仔鱼存活时间最长,耐饥饿能力最强。

Abstract:

The newly hatched larvae of artificially propagated Sebastiscus marmoratus were conducted to investigate the effect of salinity gradients (5.0,7.5,10.0,15.0,20.0,25.0,30.0,35.0) on survival activity index (SAI) of larval S. marmoratus without feeding at three temperatures (12 ℃, 16 ℃, 20 ℃). The results showed that the different salinity had a significant effect on the SAI value of newly hatched larvae of S. marmoratus. The change of SAI value increased first and then decreased with the increas of salinity.The SAI of all three different temperature treatments reached the maximum at 25.0 salinity, which was significantly higher than that of treatments with 5.0,7.5,10.0,15.0 and 35.0 salinity (P＜0.05). Under the same salinity, the SAI value of S. marmoratus larvae was the highest at 12 ℃ which was significantly higher than those at 16 ℃ and 20 ℃, and the SAI value decreased with the temperature increase. In conclusion, S.marmoratus larvae survived the longest time and had the best hunger tolerance under the conditions of water temperature 12 ℃ and salinity 25.0.