浙南沿海康氏小公鱼稚幼鱼的鉴定研究

我国东南沿海尚未开发,而又有一定经济价值的渔业资源,是当前的渔业生产中一个重要课题。而小公鱼是鱼类组成和食物链中占有极为重要的位置,并有着较丰富的资源潜力。2018年8月至2019年10月,利用大型浮游生物网I型网采用表层水平拖网(拖网 10min,速度为 3.5n mile/m)的调查方式在浙南沿海披山、洞头、南麂岛(N28°30′～N27°;E123°30′～121°30′)之间海域共采得鱼卵 351粒,仔鱼425尾。鱼卵、仔稚鱼样品共48 种,分别隶属于8 目 22 科。鱼卵优势种主要是沙丁鱼(Sardinella)、小公鱼(Stolephorus)、鳀(Engraulisjaponicus)、斑鰶(Konosirus punctatus)等。仔鱼优势种主要斑尾刺虾虎鱼(Acanthogobiusommaturus)、鳀(Engraulis japonicus)、凤鲚(Coilia mystus)、小公鱼(Stolephorus)等饵料性鱼类。其中小公鱼的稚幼鱼约一百尾。本文对8.5mm～50mm之间的小公鱼各阶段之形态特征加以描述,并以这些特征发展的过程作为定种之依据加以探讨。从研究结果表明：50.0mm标本体长为体高的4.5倍,而8.5mm标本体长竟为体高的9.4倍。随着鱼体的增长,体长与体高的比值是逐渐减小的。也就是鱼体型是随着长度之增加而逐渐变宽;鱼背鳍15～16,以15为主;臀鳍20～21,以20为主,体吻部至背鳍间的距离同全长的比值是随着鱼体之增长而逐渐减小,也就是背鳍随着身体之增长而逐渐向前推移。臀鳍情况也一样。

Study on#$NBSidentification#$NBSof Anchoviella commersonii Juvenile#$NBSfish of Southern Zhejiang

The fishery resources in the southeast coast of China, which have not been developed yet but have certain economic value, are an important subject in the current fishery production. And the male fish is the fish composition and the food chain occupies the extremely important position, and has the rich resources potential. From August 2017 to October 2018, a surface level trawl (trawl for 10min at a speed of 3.5n mile/m) was used to investigate the area of pishan, dongtou and nanji island (N28°30 "~ N27°) in the coastal area of south zhejiang province. Between E123°30 "and 121°30"), 351 eggs and 425 larvae were collected. There are 48 species of fish eggs and larvae, belonging to 22 families of 8 orders. Fish eggs dominant species mainly sardines, Sardinella, small fish (Stolephorus), anchovy (Engraulisjaponicus), spot Ji (Konosirus punctatus), etc. The dominant species of larvae were bait fish such as Acanthogobiusommaturus, anchovy (Engraulis japonicus), Coilia mystus, and Stolephorus. There are about one hundred juvenile male fish among them. In this paper, the morphological characteristics of males between 8.5mm and 50mm were described, and the development of these characteristics was discussed as the basis for species identification. The results showed that the body length of the 50.0mm specimen was 4.5 times of the body height, while the body length of the 8.5mm specimen was 9.4 times of the body height. With the growth of fish body, the ratio of body length to body height decreases gradually. That is, the size of fish gradually widens with the increase of length; Fish dorsal fin 15 ~ 16, mainly 15; The ratio of the distance from the snout to the dorsal fin to the total length decreases with the growth of the fish body, that is, the dorsal fin moves forward with the growth of the body. The same is true for the anal fin.