似刺鳊鮈的性腺发育组织学观察

Observation on the gonad development of Paracanthobrama guichenoti

对似刺鳊（ Paracanthobrama guichenoti）的性腺组织进行周年取样，采用石蜡切片技术，观察了似刺鳊卵巢、精巢发育的组织学特征和周年变化过程，结果显示：似刺鳊性成熟年龄为1龄，卵巢发育属于部分同步性，一次性产卵类型。产卵时间始于3月底，持续到5月初，在整个生殖周期内，性腺发育分六个时期，雌性全年的成熟系数一般波动在1.01％～16.50％，雄性全年的成熟系数一般波动在0.08％～0.93％。精巢属于典型的小叶型结构。精子发生经历了精原细胞、初级精母细胞、次级精母细胞及精子细胞和成熟的精子5个阶段。

The gonads of Paracanthobrama guichenoti were sampled during one year .The histological characteristics , an-nual development of ovary and spermary of P.guichenoti were observed by paraffin slice and HE staining techniques .The results showed that P.guichenoti spawned only once in a year and the age of sexual maturity is one year old .The ovarian development was partial synchronous , and its spawning period lasted from March to May .In the reproductive cycle , the development of gonads could be divided into six stages .The female gonadosomatic indexs （ GSI） were ranging from 1.01%to 16.5%all the year round , while the GSI of male were ranging from 0.08%to 0.93%.The spermary had typical lobu-lar structures, the sperms developed through five stages , including androgone, first spermatocyte, secondary spermato-cyte, spermatoblast and mature sperms .