| 摘要: |
| 参照渔业生物学、渔业资源解析学、数量遗传学等有关理论模型,并应用数值模拟方法,对长期选择性捕捞(重点为渔具选择性)是否参与造成了渔业资源的生物学变化(体长、性成熟等)进行某些基础性探索。设计了一个具有一定体长遗传特征的模拟鱼类种群,并利用一种具有固定选择性参数的拖网对其进行长期捕捞。结果表明,多年的持续的捕捞压力使得模拟种群中鱼类体长逐渐减小,减小的幅度随开发率的增大而增大,而终止捕捞后种群的体长并没有发生恢复的迹象,说明这种变化很可能伴随种群遗传的变化,具有自然不可逆性。 |
| 关键词: 拖网选择性 表型性状 和协系数 |
| DOI：10.11693/hyhz200805009 |
| 分类号: |
| 基金项目:国家科技支撑计划项目,2006BAD09A05号;农业部项目“渔具渔法专项调查与渔具选择性专题研究”资助,2006—2007 |
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| NUMERIC SIMULATION ON IMPACT OF TRAWL MESH SELECTIVITY ON PHENOTYPIC TRAITS OF FISH POPULATION |
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LIANG Zhen-Lin1,2, SUN Peng1, TANG Yan-Li1, HUANG Liu-Yi1, LU Quan1, LIU Chang-Dong1, LIU Qun1
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1.Fisheries College, Ocean University of China, Qingdao, 266003;2.Marine College, Shandong University at Weihai, Weihai, 264209
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| Abstract: |
| Constant long-time use of a certain fishing net selectivity may affect the phenotypic traits of fish population, such as body length and sex maturity. By referring to several models in fishery biology, fishery resource analytics, and quantitative genetics, a numeric simulation was conducted. A fish population having long-standing body length was designed for the simulation, upon which a trawl net of a certain mesh size and selectivity parameters was applied for long-period fishing. The result shows that, under such operation for several years, the statistic body length of the fish population had been reduced. Furthermore, the size reduction may become a genetic adaptation for the whole population, which is probably, unfortunately, irreversible. |
| Key words: Trawl mesh selectivity, Phenotypic traits, H coefficient |
