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| Effects of Morphometric Traits on Body Weight in Different Groups of Pacific White Leg Shrimp Litopenaeus vannamei |
| LIU Hong,HAO Min,KONG Dandan,DAI Xilin,CAI Shengli |
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Abstract One‐way ANOVA ,path analysis ,and multiple regression analysis were applied to analyze 24 morphometric traits including carapace length (L1 ) ,length of the first to sixth abdominal segment (L2 —L7 ) ,telson length (L8 ) ,body length(L9 ) ,total length(L10 ) ,carapace width (W1 ) ,width of the first to sixth abdominal segment (W2 —W7 ) ,carapace height (H1 ) ,and height of the first to sixth abdominal seg‐ment (H2 — H7 ) to distinguish the morphological variation in 4 groups ,V101 ,OS ,NS ,and G2 ,of Pacific white leg shrimp Litopenaeus vannamei and to find the main morhometric traits significant affecting body weight(m) .The results showed that there were significantly morphological variation in the morphometric traits in the 4 different groups (P<0 .05) ,with slender type in V101 and G2 and high fat type in OS and NS .The correlation analysis ,path analysis and degree of determination analysis revealed that carapace length and carapace height had positive effects on body weight and that the second pleopod height had a negative effect on body weight in V101 .In OS ,the body length ,the second pleopod length and carapace width were found to be positive and the sixth pleopod length negative .For NS ,carapace length and the sixth pleopod height were positive ,but carapace width was negative .For G2 ,carapace length and total length were positive ,but body length was negative .The 4 regression equations between body weight and morphometric traits were expressed at very significant level (P<0 .01) and all the multiple correlation in‐dices were greater than 0 .85 ,indicating that the major morphometric traits affecting body weight are found .The findings indicate that the major morphometric traits affecting body weight were different in the 4 groups ,and that morphometric traits for selection should be considered at different populations .
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Received: 25 May 2016
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