Length weight relationship, relative condition, size at first maturity and sex ratio of Indian mackerel Rastrelliger kanagurta from Calicut

摘要

Length weight relationship, relative condition, size at first maturity and sex ratio of Indian mackerel Rastrelligerudkanagurta was studied based on the data collected from the ring net and trawl net catches landed at Puthiappaudin Calicut during the period July 2001 to December 2004.The length weight relationship for the pooled maleudand female was W = 0.0000014 L3.3a8n d that of indeterminate category was W = .000044 L2.".T he conditionudfactor per length group the highest value was at 145 mm and in the monthly values, the lowest in May in theudsamples from both ring net and trawl net. Sex ratio showed deviation from'1:l in certain months. The size atudfirst maturity was estimated to be 173 mm for both the sexes.