| 摘要: |
| 根据2004年5月在渤海进行的拖网调查资料,分析了小黄鱼(Pseudosciaena polyatics)在经过近半世纪的捕捞后的生殖群体生殖力及其与体长、纯体质量的关系,并对小黄鱼生殖力的变化作了比较。结果表明,小黄鱼的个体绝对生殖力为14729粒±1360粒;个体绝对生殖力与叉长、纯体质量的关系变化较大;与1964年历史资料相比,相同体长组小黄鱼的个体绝对生殖力F和相对生殖力FL都显著增大(P<0.01)。小黄鱼的生殖力增加可能是小黄鱼在长期捕捞等外部环境影响下的遗传进化以及对其生存环境的适应性响应。 |
| 关键词: 小黄鱼(Pseudosciaena polyatics) 生殖力 变化 渤海 |
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| 基金项目:国家自然科学基金项目(30371104);科技基础工作项目(2003DEB3J052) |
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| Fecundity and its variations of small yellow croaker(Pseudosciaena polyatics)in the Bohai Sea |
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| Abstract: |
| Surveydata were obtained from the bottom trawling in Bohai Sea in May 2004, fecundity of spawning stock and its relationships to body length, net body weight were examined after nearly 50-year fishing activities in the area. The result shows that the individual absolute fecundity of small yellow croaker was 14 729 eggs ± 1 360 eggs. Relatioinships betwenn individual absolute fecundity and body length and weight varied obviously. For fish with the same body length group, the individual absolute fecundity and the relative fecundity FL increased significantly from 1964 to 2004 (P<0.01). The increasing in the fecundity is probably genetic, evolutionang, and adaptive response to the living environment that has changed by long-term fishing. |
| Key words: small yellow croaker (Pseudosciaena polyatics) fecundity variations Bohai Sea |
