盐度对真鲷(♀)×黑鲷(♂)杂交子一代仔鱼活力的影响

Effects of salinity on the survival activity index of Pagrosomus major(♀)× Sparus macrocephalus(♂) F_1 larva

比较了不同盐度梯度（5．0、10．0、15．0、20．0、25．0、30．0）下真鲷（Pagrosomus major，6）×黑鲷（Sparus macrocephalus，♀）杂交子一代（杂交F1）初孵仔鱼的生长情况，并在此盐度梯度下对杂交F1仔鱼进行耐饥饿试验，测定不投饵存活系数（SAI）。结果表明，10．0，15．0，20．0的3个盐度组的仔鱼生长速度最快，这3个盐度组下仔鱼的SAI值也最高，真鲷与黑鲷杂交F1的最适生长盐度为10．0—20．0。当自然海水盐度为20．0以上时，在允许的情况下，适当降低杂交F1仔鱼培育盐度，可以提高苗种的成活率。

Hybrids of Pagrosomus major （ ♀ ） and Sparus macrocephalus （ ♂ ） were successfully cultured. The effects of seawater salinity on growth rate and survival activity index （SAI） of newly hatched larvae of Pagrosomus major （ ♀ ）× Srarus macrocephalus （ ♂ ） F1 were researched. The levels of salinity were set as follows ： 5.0, 10.0, 15.0, 20.0, 25.0, 30.0. The same brood of newly hatched larva was used to carry out the experiment. The results showed that ： Salinity from 10.0 to 20.0 is suitable for growing ; both growth rate and SAI are better than the other levels of salinity （ P 〈 0.05 ）. When the salinity of normal seawater is above 20.0, reducing the living salinity properly can improve the vitality and the survival of larva fish.