温度和盐度对大泷六线鱼仔鱼存活与生长的影响

The effects of temperature and salinity on survival and growth of larval Hexagrammos otakii Jordan et Starks

关键词:  大泷六线鱼  温度  盐度  存活  生长

Key words:  Hexagrammos otakii Jordan et Starks  Temperature  Salinity  Survival  Growth

摘要:

研究了温度和盐度变化对大泷六线鱼Hexagrammos otakii Jordan et Starks仔鱼存活与生长的影响。结果表明，大泷六线鱼初孵仔鱼及10日龄仔鱼在温度4~16℃范围内都能存活与生长，存活率均在84%以上，温度为20℃试验组的存活率均低于50%。盐度渐变条件下，盐度10~30范围内存活率都大于90%，在盐度为5及以下时仔鱼的存活率降为0，仔鱼对高盐度的适应能力较差。盐度突变条件下，盐度25和30的试验组仔鱼的存活率都在95%以上，盐度10~20的试验组仔鱼出现不同程度的死亡，存活率可达56%~75%。大泷六线鱼仔鱼的最适生长温度为12~16℃，最适生长盐度为25~30。

Abstract:

The effects of temperature and salinity on the survival and growth of larval Hexagrammos otakii Jordan et Starks were studied. It showed that the newly hatched larvae and 10 dph larvae of H. otakii Jordan et Starks could survive and grow at temperature of 4~16℃, with the survival rate of more than 84%, while the survival rate was below 50% at 20℃. Under gradual salinity change, the survival rate was more than 90% at salinity of 10~30.The survival rate was zero when the salinity was 5 and below, and the ability of adapting to high salinity was also poor. Under sudden salinity change,the survival rate was more than 95% at salinities of 25 and 30, and the survival rate was 56%~75% at salinity of 10~20. The most suitable temperature range is 12~16℃，and the most suitable salinity range is 25~30 for H. otakii Jordan et Starks.