【摘 要】
：
采用常规解剖和组织学切片的方法,对长江上游宜宾江段长鳍吻的卵巢发育、卵子发生以及成熟系数的周年变化进行了研究.研究结果表明,长鳍吻(鱼句)卵巢发育分为Ⅵ期,卵母细胞发
【机 构】
：
中国长江三峡集团公司 中华鲟研究所
论文部分内容阅读
采用常规解剖和组织学切片的方法,对长江上游宜宾江段长鳍吻的卵巢发育、卵子发生以及成熟系数的周年变化进行了研究.研究结果表明,长鳍吻(鱼句)卵巢发育分为Ⅵ期,卵母细胞发育分为6个时相,第2时相中期出现卵黄核,2时相晚期迁移至皮质层破碎、消失;第3时相早期卵黄核消失位置开始出现卵黄泡,第3时相中后期放射带出现后卵黄颗粒开始积累;第5时相卵母细胞体积最大,胞径(1805±60.99) μm.卵巢成熟系数周年变化范围为0.78％～18.22％,一年内仅在4月份出现一个峰值,4-5月大部分卵巢处于Ⅳ、Ⅴ期,综合成熟系数测定和性腺组织学观察结果,初步推测长鳍吻(鱼句)繁殖期为3-5月,产卵盛期为4月上旬至5月上旬.
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