稀有鮈鲫胚后发育和幼鱼生长的初步研究

POSTEMBRYONIC DEVELOPMENT AND GROWTH OF CULTURED RARE MINNOW, GOBIOCYPRIS RARUS

本文介绍了室养条件下稀有 鲫胚后发育与幼鱼生长的特点。稀有 鲫的胚后发育过程可分为3个阶段共11个时期，在水温24．7—31．8℃的条件下，初孵仔鱼经25—30d即可完成胚后发育。在胚后发育期间，仔鱼、稚鱼及幼鱼呈线性生长，每日增长0．52mm左右。饲养条件对生长和发育均有很大影响。在相同的饲养条件下，采于四川省汉源县、灌县及彭县的亲鱼，其后代在生长上无显著性差异。

Postembryonic development and growth of laboratory cultured rare minnow,Gobiocypris rarus were studied from 1990 to 1993. The postembryonic development is divided into early-stage larva. late-stage larva and juvenile period on the basis of the external morphology, internal morphogenesis and biological characters. A total of 11 stages are subdivided among the three periods. At the water temperature ranging from 24.7 to 31.8℃, the postembryonic development lasts 25 to 30 days, and the larva grows uniformly with a growth rate 0.52mm per day. Cultulal conditions influence the development and growth effectively. In similar conditions, descendants from different populahons grow at the same growth rate no matter whether their parents were captured in Hanyuan County, Guanxian County, or Penxian County.