浙南沿海地区康氏小公鱼仔鱼的鉴定研究

Identification of Anchoviella commersonii Juvenile Fish in Coastal Areas of Southern Zhejiang Province

我国东南沿海具有一定经济价值的渔业资源是当前渔业生产中一个重要课题。本文对体长为7.5~50.0 mm的小公鱼属仔鱼的形态特征进行描述,并将这些特征发展的过程作为定种的依据。结果表明,体长50.0 mm标本体长为体高的4.5倍,而体长8.5 mm标本体长为体高的9.4倍,随着鱼体的增长,体长与体高的比值逐渐减小;鱼背鳍15~16条,以15条为主;臀鳍20~21条,以20条为主;体吻部至背鳍间的距离与全长的比值随着鱼体的增长而逐渐减小,背鳍和臀鳍随着体长的增长逐渐向前推移;标本总肌节数为43节,而康氏小公鱼成鱼也有43节脊椎。这些特征对鉴定出这批标本为康氏小公鱼提供了更有力的证据。

The fishery resources in the coast of southeast China with certain economic value are an important subject in fishery production at present.In this paper,the morphological characteristics of Anchoviella juvenile fish with body length of 7.5-50.0 mm were described,and the develop-ment process of these characteristics was used as the basis for species determination.The results showed that the specimen body length of 50.0 mm was 4.5 times of the body height,while the specimen body length of 8.5 mm was 9.4 times of the body height.With the growth of fish body,the ratio of body length to body height decreases gradually.The number of dorsal fin was 15-16,mainly was 15;the number of anal fin was 20-21,mainly was 20.The distance between the snout and the dorsal fin decreased with the increase of the fish body;the dorsal fin and anal fins moved forward gradually with the increasing of body length.The specimen had total 43 sarcomeres,and the Anchoviella commersonii also had 43 vertebraes.These characteristics provide further evidence for the identification of A.commersonii.