论文部分内容阅读
通过对条石鲷胚胎发育和仔鱼发育形态的观察,确定了条石鲷早期发育的进程。条石鲷的受精卵为圆球形、透明、浮性,卵径为0.90~0.95 mm,油球1个,卵裂为盘状卵裂。在水温23~24℃,盐度26~28的条件下,受精后7 h 10 min,胚胎发育至原肠期;受精后12 h,眼囊形成;受精后20 h 30 min,心跳开始搏动;受精后26 h 30 min,仔鱼孵出。初孵仔鱼全长1.78~2.03 mm,至5日龄全长3.25~3.30 mm时,卵黄囊完全消失;至8~15日龄,全长3.50~4.97 mm时,鳔形成;至18~20日龄,全长7.10~7.31 mm时,尾鳍鳍条发育完整。
Through the observation of the embryonic development and larval development of the barred sea bream, the process of the early development of the barbed bream was determined. The fertilized eggs of the goby are spherical, transparent and floating with an egg diameter of 0.90-0.95 mm, one oil globule, and a cleavage of the cleavage to a discoid cleft. Under the conditions of water temperature 23 ~ 24 ℃ and salinity 26 ~ 28, the embryos developed to the intestine at 7 h and 10 min after fertilization; the eye sac formed 12 h after fertilization; the heart beat started at 20 h after fertilization; 26 h after fertilization 30 min, larvae hatched. The newly hatched larvae ranged from 1.78 to 2.03 mm in length and disappeared completely until the total length of 3.25-3.30 mm at 5 days of age. The larvae formed from 8 to 15 days of age with a total length of 3.50 to 4.97 mm, and from 18 to 20 days Age, full-length 7.10 ~ 7.31 mm, caudal fin fin developed.