Comparative Study on Biological Characteristics and Correlation Analysis of Morphological Characteristics of Lepidotrigla abyssalis
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Abstract:
100 Lepidotrigla abyssalis samples were collected from Nujiang River.Its morphological characteristics were measured, including standard length, total length, head length, head depth, body depth, body width, proboscis length, eye diameter, postorbital length of head, caudal length and caudal depth weight. The correlation between the morphological characteristics and the main morphological parameters affecting the body mass were studied by analysis of variance, partial correlation analysis, path analysis and regression analysis. The results showed that head length, head depth, body depth, body width, eye diameter, caudal depth, weight and body length were exponentially related (P <0.01). Total length, standard length, caudal length and body length showed a linear correlation (P<0.01). The fitting equation between standard length and weight was: y=0.0231x2. 8265 (R2=0.9852). The value of b was 2.8265(less than 3), being of negative allometric growth.The growth rate of the length were higher than that of the weight. Head length, head depth, body depth, postorbital length of head and caudal length were significant related to the weight of Lepidotrigla abyssalis. The sequence of direct effect quality were as follows: head length (0.184**)> caudal length (0.154**)> head depth (0.136**)> body depth (0.099**)> postorbital length of head (0.026**. The optimal multiple regression equation were: y=-89.799 +3.711x1+9.975x2 +11.996x3+6.112x4+7.499x5.
