大泷六线鱼胚胎发育及其与水温的关系

对大泷六线鱼胚胎发育过程中各期特征及发育时间进行了详细的观察记录,并进行显微拍照。大泷六线鱼卵为球形沉性卵,端黄卵,卵径1.62～2.32mm,油球小而多且较分散,卵膜较厚,透明度差。温度实验结果显示,孵化水温对胚胎孵化有显著影响,适温范围内孵化时间随水温的升高逐渐缩短,孵化率随水温的升高呈先升高后降低的趋势,在16℃时达到最大值79%;畸形率随水温的升高呈先降低后升高的趋势,在16℃时达到最小值6%;在水温16℃、盐度为31、pH=8.0的自然海水中,光照条件600～1000lx,大泷六线鱼胚胎发育历时20d,仔鱼破膜而出。

Embryonic development of Hexagrammos otakii and its relationship with incubation temperature

The embryo development duration and characteristics of Hexagrammos otakii were studied, with each development stage being taken microphotography. The egg of H. otakii was demersal, telolecithal,spherical with diameter of 1.62～2.32 mm. Incubation temperature had a significant effect on embryonic development of H. otakii. With the increasing incubation temperature in an appropriate range, the incubation duration reduced; The incubation rate increased to the maximum of 79% at 16℃, and then decreased. The deformity rate decreased to the minimum of 6% at 16℃ and then increased. Fertilized eggs hatch in about 20d under the conditions of 16℃, 31 salinity, pH=8.0 and 600～1 000 lx light intensity.