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| The Relationship between Morphometric Traits and Body Weight in 4 Species Crab f rom Bohai Bay |
| XU Hailong,LIU Yang,GU Dexian,QIAO Xiuting |
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Abstract The present study describes the correlation among carapace length (L1 ) ,carapace width (L2 ) , abdomen length (L3 ) ,abdomen width (L4 ) and body weight (m) of 4 species of crab caught from June 2008 to May 2009 in Bohai Bay with the methods of path analysis and step regression .The results showed that the correlation between the morphometric traits of each species of crab was significant (P <0 .01) , and the lnL2 had the most direct effect on ln m in Eucrate crenata and Portunus trituberculatus ,the direct path coefficient is 0 .661 and 0 .649 ,respectively ,while in Dorippe japonica and Charybdis japonica ,the most direct effect on lnm was is LnL1 ,the direct path coefficient was 0 .569 and 0 .659 ,respectively .And the equation of E .crenata lnm= -7 .622 +1 .972lnL2 +1 .143lnL1 -0 .083lnL4 (r=0 .940) ,D .japonica lnm= -7 .062+ 2 .971lnL1 (r= 0 .971) , P . trituberculatus Lnm= -8 .058+ 2 .238lnL1 + 0 .660lnL2 +0 .129lnL4(r=0 .986) ,C .japonica lnm= -8 .292+2 .081lnL2 +0 .964lnL1 (r=0 .986)were established using the stepwise regression method .
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Received: 25 March 2014
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