【摘要】 乌鳢最初出现鳞片时的全长为１９．３～２０．６ｍｍ，日龄２０～２２ｄ；鳞被复盖完毕时全长２９．９～３４．１ｍｍ，日龄３５～３９ｄ。鳞被发育过程中出现４个起始中心，第１中心为头顶部，主要中心为体侧前部，２个次要中心为鳃盖处和胸部。仔鱼体长２０ｍｍ左右鳞片上开始出现环片，全长２７ｍｍ左右出现鳞沟。仔鱼全长和鳞径、环片数之间，日龄和环片数之间均呈显著的直线相关关系。更多还原

【Abstract】 This paper deals with the origin,formation process and the morphological characteristics of scales of the Chinese snake-head fish(Channa argus).The results were as follows:The first appearance of scales is found at the total body length of 19.3～20. 6(average,19.7)mm,and 20～22 days after hatching. The body is completely covered with scales at 29.9～34.1(average,31.4)mm and 35～39 days after hatching. There are four formation centers during the scale developmental process. The center of first scale appearance on the head(parietal bone),the main one is on the anterior part of the body,immediately below the lateral line. The other two origin centers are of secondary importance,locating separately in front of the poctoral fin(chest) region and on the operculum. The circuli appear when the total body length of fish is about 20 mm. The appearance of scale grooves are at about the total body length of 27 mm. There are a linear correlation between them:such as the total body length and the radii of scale,the number of circuli and days after hatching and the total body length and the number of circuli.更多还原