长江河口区凤鲚的资源现状
STATUS QUO OF TAPERTAIL ANCHOVY RESOURCE IN THE ESTUARIES OF THE YANGTZE RIVER
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摘要: 对近年来长江河口区凤鲚繁殖生物学及资源现状进行了研究.研究结果表明:繁殖期渔获物平均全长1.14±1.70cm,平均体重13.93±4.21g.全长与体重呈幂函数相关,W＝0.0034L2.8891,R2＝0.9034.成熟卵卵径0.7±0.08mm,绝对怀卵量14190±4703粒,相对怀卵量1073±175粒/g体重.繁殖期个体绝对怀卵量与全长、体长均呈直线相关.1997-1999年长江河口区凤鲚总渔获量在114t左右,不随捕捞努力量的增加而增加,汛末瞬时资源量维持在20-30t,与历史年份相比较,捕捞产量下降明显.其原因是:捕捞强度过高、水域环境恶化、天然繁殖场遭到破坏.Abstract: The studies on reproductive biology and resource present of tapertail anchovy in the estuaries of Yangtze River in the recent years were carried on.The result showed that the average total length and body weight of the catching during the spawning period were 16.14?.70cm and 13.93?.21g,respectively.The total length was related to the power function of the body weight:W= 0.0034L2.8891,R2=0.9034.The diameter of matured egg was 0.67?.08mm;the absolute fecundity was 14190?703 eggs/fish,and the relative fecundity was 1073?75 eggs/g body weight.The absolute fecundity of the fish in spawning season had liner relationship with the total length and body weight. The total catching of tapertail anchovy in the estuaries of the Yangtze River varied around 1164 tons during 1997-1999,and the catching did not increase with the fishing effort.The abundance of the fish maintained between 20 and 30 tons at the end of the fishing season.Compared with previous years,the total catching declined significantly.The authors held that over fishing,deterioration of water environment and damage to the natural spawning ground were the main reasons,which caused the resources of tapertail anchovy to decline.
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Keywords:
- Yangtze Rive /
- Tapertail anchovy(Coilia mystus) /
- Biology /
- Resource
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