The length-weight also helps in predicting the condition, reproductive history and life history of fish species. In the present study, the length - weight relationship in E.malabaricus has been studied with the objectives of provides a set of estimating equations and to determine whether any differences exists in their relationship between males, females and juveniles. The regression parameters of the length - weight relationship of E.malabaricus and the details of sums of squares and products of length - weight data of males, females and juveniles were analyzed. While analyzing of length - weight data of E.malabaricus separately for males, females, and juveniles for the year 2009 and 2010 the regression lines indicated a close relationship without any inflection. Slope values (b value) of males, females and juveniles are centered around 2.05, 2.78 and 2.01 for 2009 and 2.66, 2.80 and 2.35 for 2010 respectively. The correlation coefficients (r) were greater than 0.9. The study observed significant variations in the 'b' value of the grouper (male female and juvenile) collected from Mandapam Palk Bay and Gulf of Mannar coastal waters during the study period.
