Abstract:

To understand the biological characteristics of 1-year-old Micropterus salmoides, both external morphological traits and internal anatomy are investigated by using traditional methods of morphology and anatomy method. M. salmoides is spindle-shaped and covered with ctenoid scale. Its body shows black back, turquoise body side and white abdomen. There are black stripes on body. The ratio of intestine gut length to body length is 0.833, while the ratio of intestine and viscera weight to body weight is 0.006 and 0.091, respectively. Observed numbers of morphological characteristics of M. salmoides are: dorsal fins Ⅷ-Ⅸ(14-15), caudal fins 22-23, anal fins Ⅱ( 10-12), pelvic fins Ⅰ(5), pectoral fins 12~14, lateral line scales 64-71, the upper scales of lateral line 6-10, the lower scales of lateral line 16-17, the first gill arch raker 7-8, pyloric caecum 16-27, vertebrae 26-32. The correlation equation of total length (T_L) and body weight (B_W) is: B_W=2407-20.711T_L+0.047T_L ²(R²=0.942). The correlation equation of body height and body weight is: B_W=0.005B_H^2.591(R²=0.982). Body height, body width and head height are the main traits that affect body weight. The results could provide morphometric tools for species identification, systematic taxonomy, artificial propagation and variety breeding of M. salmoides.

Key words: Micropterus salmoides, morphological characteristics, internal structure, correlation analysis, path analysis