保安湖鳜鱼卵巢的周年变化

THE ANNUAL CHANGES IN THE OVARIES OF MANDARINFISH FROM BAO'AN LAKE

对保安湖性成熟雌性鳜鱼卵巢进行了组织和组织化学研究．鳜鱼卵母细胞发育分为5个时相，退化卵终年存在．区分为产前萎缩和产后退化吸收．鳜鱼的繁殖期在4月底至6月底．一个生殖周期中，卵巢两次达到成熟，为分批产卵类型．鳜鱼卵黄物质有三种形式，液泡含大量多糖物质，油滴含大量脂类，卵黄颗粒含有蛋白质、多糖和脂类．蛋白质含量随卵母细胞发育而增加．

The histology and histochemistry of ovaries in sexually matured female mandarinfish,Siniperca chuatsi,in Bao' an Lake. were studied. The development of oocytes of mandarinfish underwent five consequent phases, Atresia existed all year. which divided into prespawning atresia and post-spawning degeneration. In the annual cycle. the ovaries were resting stage (stage Ⅲ) from November to March next year. and prematuration ovaries (stage Ⅳ ) in April. Reproductive season of mandarinfish was from late April to late June,and spawning ovaries (stage Ⅴ ), first post -spawning ovaries (stage Ⅵ -Ⅳ) and second spawning (stage Ⅴ ) were found in this period. In July, most ovaries were in second postspawning (stage Ⅵ - Ⅳ) which were gradually degenerated and reabsorbed to stage Ⅱ from August to October. In a yearly cycle, the ovaries of mandarinfish spawned twice. and the interval was 30 - 40 days.Yolk materials of oocytes in mandarinfish had three forms: yolk vesicles. oil droplets and yolk granules. Polysaccharides were abundant in yolk vesicles. Oil droplets mainly contained lipids, and yolk granules were composed of proteins, lipids and polysaccharides.