Morphometrics and Length-Weight Relationship in the Blue Swimmer Crab, Portunus Pelagicus (Linnaeus, 1758) (Decapoda, Brachyura) from the Mandapam Coast, India

In this study, the interrelationships between various morphometric characters, viz., carapace \nwidth and length and chelar propodus length and height in males, as well as carapace width and \nlength and abdominal width and length in females, were estimated using a total of 980 crabs, \nPortunus pelagicus. The carapace width/length — weight relationship was studied in both sexes \non a total of 1188 crabs using the allometric growth equation of Von Bertalanffy. The allometric \nrelationships between the characters of this set suggest that most relationships are positive and \nhighly significant. The ‘b’ values for carapace width-weight in males and females were 3.607 and \n3.293, respectively, and for carapace length-weight they were 3.049 and 2.774, respectively. The \nresults show a significant deviation from an isometric growth pattern. An analysis of covariance \nindicates that there is a significant difference between sexes with respect to the carapace widthweight \nrelationship