论文部分内容阅读
1998年 3月～ 1999年 5月间调查了筏式养殖体系中中间球海胆生殖腺发育的周年变化。结果表明 ,海胆的个体大小及性别不同 ,生殖腺成熟期及生殖腺指数变化略有不同。A组 (壳径 3 5～ 5 0cm)海胆的成熟期为 6～ 10月 ,B组 (壳径 5 0～ 6 5cm)为 5～ 10月。壳径大的海胆生殖腺成熟早且成熟期长。雄性较雌性生殖腺发育较快 ,成熟较早 ,成熟期保持时间长。 10月底至 11月初生殖腺指数急剧降低 ,此时为繁殖高峰期。雄性个体的生殖腺指数在 3～10月间略高 ,其余时间无明显性别差异。除排放期和恢复期外 ,A组的生殖腺指数均略低于同期B组
From March 1998 to May 1999, the annual changes of gonadal development of the sea urchin in the raft culture system were investigated. The results showed that the size and sex of the sea urchins vary, the gonadal maturation and gonadal index changes slightly different. The maturation period of sea urchin in group A (shell diameter 35 ~ 50 cm) was from June to October, and in group B (shell diameter 50 ~ 65 cm) was from May to October. Larval shellfish gonads mature early maturity and long. Male than the female gonads develop faster, mature earlier, mature period to maintain a long time. At the end of October to early November, the gonad index dropped dramatically, at this time the peak of breeding season. The gonadal index of male individuals was slightly higher from March to October, while there was no significant gender difference in the rest of the time. In addition to the discharge period and recovery period, the gonadal index in group A was slightly lower than that in group B in the same period