| 摘要: |
| 根据东海区主要海洋渔业公司1950～1995年分品种渔获物产量的统计数据,分析了东海区渔获物营养级的变化过程,用平均营养级指数来评估东海区海洋渔业资源的开发利用状况。结果表明,经过几十年的捕捞开发,东海区渔获物的平均营养级已从1965年的3.5下降到1990年的2.8,自1974年后海区的产量主要依靠捕捞低营养级品种如马面鲀等而获得。东海区海洋捕捞渔获物营养级结构已经发生了变化,1974年后捕捞主要在低营养级品种内进行。另外还描述了东海区带鱼等品种的种群内部结构小型化、低龄化现象。 |
| 关键词: 东海区 渔获物 平均营养级 |
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| 基金项目:农业部渔业生态环境重点开放实验室开放基金(2003-10) |
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| Changes in trophic level of marine catches in the East China Sea region |
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| Abstract: |
| In this paper, the change in trophic level of marine catches in East China Sea region is studied, based on the data from main fishery companies in East China Sea from 1950 to 1955. The index of mean trophic level is used to access the condition of expoitation and usage of marine fishery resources in East China Sea. The results show that the mean trophic levle had decreased from 3.5 in 1965 to 2.8 in 1990, and the yields after 1974 was supported by catches of low trophic level species such as Cantherhines etc.. The trophic structure of marine catches in East China Sea had changed much to low trophic level species since 1974. Theis paper also discusses the phenomenon that the catches have been become smaller and younger of some species in East China Sea such as Trichiurus japonicus. |
| Key words: East China Sea catches mean trophic level |
