Seasonal variation of condition factor and weight - length relationship in Thryssa hamiltonii Gray, 1835 (Clupeiformes: Engraulidae) collected from Balochistan coast in the Arabian Sea, Pakistan

Present study deals with the effects of seasonal variation on condition factor (CF) and weight - length relationships (WLRs) of Thryssa hamiltonii, sampled during pre and post- monsoon seasons in 2011 from the Balochistan coast of the Arabian Sea. The results showed that T. hamiltonii has isometric growth characteristics in pre and post-monsoon. The value of b was calculated as 3.2364 in pre-monsoon, as 3.0499 in post-monsoon season and as 3.1346 in combined data with not significantly different from 3 (Pauly’ t test, P > 0.05) Moreover, the mean CF was calculated between 0.13 - 0.60 (mean: 0.26±0.010) in pre-monsoon season and between 0.19 - 0.90 (mean: 0.39±0.017) in post-monsoon season. The calculated CF showed statistically difference among the pre-monsoon, post-monsoon and combined data (One way ANOVA, P = 5.47E-08)