温度对黄鲷胚胎发育的影响

The effect of temperature on embryonic development of Dentex tumifrons(Temminck et Schlegel)

研究了孵化水温对黄鲷胚胎发育的影响。结果表明：在16～26℃范围内，黄鲷胚胎都能孵出仔鱼，孵化速度随水温上升而加快。其中18～22℃是黄鲷胚胎孵化的最适温度，孵化率最高，20℃时达89％，畸形率最低；受精卵42min细胞开始分裂，3h30min为多细胞期，7h为囊胚期，22h胚孔关闭，37h仔鱼开始孵出，孵出仔鱼健壮活泼。当水温高于26℃或低于16℃时，黄鲷胚胎不能孵出仔鱼；水温低于14℃时胚胎发育停止于高囊胚，12h后受精卵开始变浊死亡；水温高于28℃时，胚胎发育至多细胞期，胚盘聚合死亡。黄鲷胚胎发育的有效积温为422．2～483．6（h·℃）。黄鲷发育的阈温度为7．

This paper depicted the effect of temperature on the embryonic development of Dentex tumifrons （Temminck et Schlegel）. The experimental result showed that the embryo could be hatched out at the range of 16- 26 ℃. With rising of the water temperature the speed of the hatching was expedited. The most proper water temperature was at 18 - 22 ℃ of this behavior and the rate of hatching was the highest. The fertilized eggs divided after 42 min and it went to the stage of muhicell after 3 hrs and 30 min; it was in the stage of blastula after 7hrs; balastopore closed after 22 hrs and hatched larva after 37 hrs.The rate of hatching was 89 %, the rate of abnormality was 12% and the larvae swam vigorously and vivaciously. However, the embryo was not incubated below 16 ℃ or over 26 ℃. The embryos development stopped at the stage of blastula below 14 ℃ and the fertilized egg died after 12 hrs;the embryos died at the stage of muhicell over 28 ℃. The sum of effective temperature was 422.2 - 483.6 h℃ and the developmental threshold temperature was 7.88 ℃.