徐家河水库近太湖新银鱼(Neosalanx pseudotaihuensis Zhang)的性腺发育与产卵类型

利用斜生栅藻对山东禹城地区碳酸盐水型瘦水与肥水两种水体进行生物改良后，引种短钝蚤作室内培养试验，研究结果表明，短钝蚤在有适宜种类微藻作开始环境的先驱生物存在条件下，可以耐受碳酸盐型水质，并能成功地生长繁殖，本文还对３种培养液及两种培养模式下种群增长的动态规律作了初步的探讨。

Ovarian Development and Spawning Pattern of Neosalanx pseudotaihuensis Zhang in Xujiahe Reservoir, Hubei Province

Samples were collected monthly from Xujiahe Reservoir from April 1992 to May 1996 and the ovarian development and spawning pattern in Neosalanx pseudotaihuensis Zhang were described. A histological analysis of oocyte development in N. pseudotaihuensis shows that the fish spawns serially. A six-stage maturity scale, based on both external morphology and oocyte composition, was proposed to classify ovarian development in N. pseudotaihuensis. Monthly trends in stages in ovarian development with the size and maturity of oocytes indicate that spawning extended from March to May and peaked between mid-April and mid-May. Histology of ovarian shows that N. pseudotaihuensis produced clutch-es of eggs, which were released at intervals. Data on length-frequencies and gonads shows that N. pseudotaihuensis typically died in a few weeks after last spawning.