南沙群岛珊瑚礁区7种鲈总科鱼类鳞片年轮特征

The annuli character of scales of Percoidei in the coral reef of Nansha Islands

选取2004年5月至7月三重刺网自南沙群岛珊瑚礁区捕获的7种鲈总科鱼类的鳞片标本,使用显微镜与投影仪结合观察年轮特征,进一步鉴定鱼类年龄。结果表明:此次调查采集到的南沙群岛鲈总科鱼类鳞片的年轮标志主要为侧区出现切割型环片;从年龄结构上看,该次调查自南沙群岛珊瑚礁区捕获的鱼种年龄以3-6龄鱼为主,这主要与网具的选择性有关。同时,也论述了鳞片采样以及观测中的注意点,以期为南海鱼类年轮的鉴定提供借鉴。

Annuli character are studied in this paper by observing the scales specimens collected from 7 fish categories belong to Percoidei, which are captured in the coral reef of Nansha Islands from May to July 2004 using trammel net. We use the microscope and projection lens to observe the annuli for distinguish the groups of circuli. The results are as follows ： The annuli character is mainly marked by the cut groups of circuli in the profile areas. Seen from the struture of age composition, the fish of Percoidei which were caught in the coral reef of Nansha Islands is mainly age 3 to 6 years old, was mainly related with the selectivity of gill net. At the same time, this article has discussed the attention in the experimentation and provides reference for annilu identification of fish captured from South China Sea.