温度和盐度对日本黄姑鱼胚胎发育的影响

为了确定日本黄姑鱼（Nibea japonica）胚胎孵化的最适水温和盐度，采用不同水温和盐度对日本黄姑鱼受精卵进行了孵化试验。结果显示，在盐度为30的条件下，日本黄姑鱼受精卵在14～28℃范围内均能正常孵化，最适孵化水温为18～20℃。孵化时数与温度呈幂函数相关，孵化时间随温度升高而缩短。盐度试验表明，在水温为18℃的条件下，日本黄姑鱼受精卵在盐度25—32的海水中呈悬浮或者半悬浮状态，在盐度14～45范围内均能孵化，适宜孵化盐度为26～32。盐度对初孵仔鱼全长有显著影响，盐度较低组仔鱼全长显著大于高盐度组（P〈0．05）。

Effects of temperature and salinity on embryonic development of Nibea japonica

To determine the suitable temperature and salinity for hatching, the embryos of Nibea japonica were hatched at different temperatures and salinities. The result indicates that at salinity of 30, the fertilized eggs can be hatched within 14 -28 ℃ and the optimal temperature for hatching is 18 -20 ℃. The hatching time （H） and temperature （T） are power function relative. The hatching time shortens with rising temperature. All fertilized eggs of N.japonica hatch within the salinity of 14 - 45, suspend or semi-suspend within the salinity of 25 -32 at 18 ℃, and the suitable salinity for hatching is 26 - 32. The total length of newly hatched larvae, which in low salinity group is significantly longer than that in high salinity group （ P 〈 0. 05 ） , is significantly affected by salinity.