| 东、黄海绿鳍马面鲀的资源评估 |
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| 引用本文： | 许学龙,郑元甲,刘松.东、黄海绿鳍马面鲀的资源评估[J].海洋与湖沼,1992,23(6):651-656. |
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| 作者姓名： | 许学龙 郑元甲 刘松 |
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| 作者单位： | 中国水产科学研究院东海水产研究所，中国水产科学研究院东海水产研究所，中国水产科学研究院东海水产研究所 上海 200090，上海 200090，上海 200090 |
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| 基金项目： | 中国水产科学研究院课题 |
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| 摘 要： | 运用Pope-Shepherd多世代解析法推算了1977—1987年东、黄海绿鳍马面纯的各龄组资源量及捕捞死亡系数变动。结果表明,一龄以上资源量从70年代末的70余万吨逐步减少,80年代中期降到约50万吨的最低点。此后渔获物中一龄鱼比例大幅度增加。1984—1986三年中一龄鱼分别占渔获物的14.8％,53.3％。和16.2％(重量比例)。但因东、黄海主要底鱼衰退,生态系结构发生变化,马面纯幼鱼补充多于70年代,特别是1985年和1986年幼鱼补充量显著增加,出现二个较强的补充群体,使1986和1987年的2龄鱼数量有所增加。但该期间3龄以上成鱼资源量仍低于70年代水准,反映出捕捞强度过大。根据生物量曲线解析,将开捕年龄提高到3龄才能获得最佳管理效果。
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| 关 键 词： | 绿鳍马面鲀 资源 东海和黄海 |
ESTIMATION OF STOCK SIZE OF FILEFISH THAMACONUS MODESTUS IN THE EAST CHINA SEA AND YELLOW SEA |
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| Xu Xuelong,Zheng Yuanjia and Liu Song.ESTIMATION OF STOCK SIZE OF FILEFISH THAMACONUS MODESTUS IN THE EAST CHINA SEA AND YELLOW SEA[J].Oceanologia Et Limnologia Sinica,1992,23(6):651-656. |
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| Authors: | Xu Xuelong Zheng Yuanjia and Liu Song |
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| Abstract: | Estimation of stock size and fishing morta lity for filefish (Thamaconus modestus) in the East China Sea and Yellow Sea from 1977 to 1 987 were made by the Pope-Shepherd Multi-Cohort Method. The findings indicated that the stock biomass of adults (2-6 years old) amounted to 700 000 -800 000 tons in the late 70s, had reduced since the early 80s, and declined to lowest level in the middle 80s, when the stock biomass left was only about 500 000 tons. Since then the catches increased mainly on 1-year-olds. From 1984 to 1986 proportions of 1-year-olds made up 14.8, 53.3 to 16.2 per cent of the total catches of filefish, respectively. The con-tinuosly high recruitment level in 1985 and 1986 enabled the stock size of 2-year-olds to recover to some extent in the next years, though the size of spawning stock (3-6 years old) was still smaller than that of the 70s., thus reflecting a trend of overfishing.Effect of the Pope-shepherd Method was verified by assumed data, which shows that the stock number can be estimated precisely by the data of catch number.Based on the biomass analysis, optimal management effect could be obtained by raising the first capture age to age 3. |
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| Keywords: | Thamaconus modestus Stock size China Sea Yellow Sea |
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