论文部分内容阅读
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42 min细胞开始分裂,3 h 30 min为多细胞期,7 h为囊胚期,22 h胚孔关闭,37 h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,12 h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7.88℃
The effects of incubation temperature on the embryo development of the yellow bream were studied. The results showed that larvae could hatch larvae at 16-26 ℃, and the hatching rate increased with the rise of water temperature. Among them, 18-22 ℃ was the optimum hatching temperature for the seabream. The hatching rate was the highest, reaching 89% at 20 ℃ and lowest deformity rate. The cells began to divide after 42 min of the fertilized eggs, Blastocyst stage, 22 h embryo closed, 37 h larvae began to hatch, live larvae robust and lively. When the water temperature is higher than 26 ℃ or lower than 16 ℃, the larvae can not hatch the larvae. When the water temperature is lower than 14 ℃, the embryos stop in the high blastocysts, and the fertilized eggs begin to become turbid after 12 h. The water temperature is higher than 28 ℃ At embryonic development up to the multiple cell stage, the blastocyst polymerization ceases. The effective accumulated temperature of the development of the seabream is 422.2 ~ 483.6 (h. ℃). The threshold temperature for the development of yellow snapper is 7.88 ℃