盐度对菊黄东方鲀受精卵孵化和仔鱼生长的影响

比较在0、5、10、15、20、25、30(自然海水)、35、40、45、50等11个盐度梯度下,菊黄东方鲀(Takiugu flavidus)的受精卵发育和仔鱼生长情况,测定仔鱼的不投饵存活系数(SAI).结果表明:1)菊黄东方鲀受精卵在盐度0~50范围内均可孵化,最适盐度20~25.盐度(x)与孵化时间(y)呈正相关关系,表达式为:y=0.345 x+141.1,R2=0.956.2)实验盐度范围内,菊黄东方鲀仔鱼SAI值为1.55~30.10.3)在盐度5~45条件下,仔鱼皆可存活,存活率为3%~27%.其中,在10~30盐度下存活率较高,为20%~27%.经15 d的培育,仔鱼平均全长为6.28~7.34 mm.低盐度对菊黄东方鲀仔鱼生长更有利,在15~20盐度条件下,仔鱼生长较好,最终平均全长为7.30~7.34 mm.4)根据SAI值和生长状况,仔鱼生长和存活的适宜生长盐度为10~30,最适盐度范围为15~20.

Effect of the Salinity on Embryo and Larval of Takifugu flavidus

The development of fertilized eggs,the growth of larval and the survival activity index(SAI) of newly hatched Takifugu flavidu larval were observed under the conditions of different salinities,namely 0,5,10,15,20,25,30(natural salinity),35,40,45 and 50.The results showed that:(1) The fertilized eggs of Takifugu flavidu can be hatched under salinity 0-50,and 20-50 is the optimal salinity range.Salinity is positively related to hatching period.Functional relation is y = 0.345 x + 141.1,and R2 = 0.956.(2) The SAI values of Takifugu flavidu larval are 1.55-30.10 under experimental salinities.(3) Under salinity 5-45,the mean survival ratios of larvae are 3%-27%,and the survival ratios,20% 27%,are higher under salinity 10 – 30.The mean total length of larvae is 6.28-7.34 mm after 15 d’s rearing.The low salinity is suitable for the growth of larvae,and the growth of larvae is better under the salinity conditions 15-20,and the final mean total length of larvae are 7.30-7.34 mm.(4) The suitable salinity range for larval survival activity is 10-30 and the optimum salinity range is 15-20 according to SAI values and growth conditions.