On the maturity of Sardinella dayi Regan in Karwar Region (West coast of India)

Abstract

Study on spawning biology of Sardinella dayi Regan for 1979-83 period shows that the size at first maturity is attained around 140 mm. For determining maturity and nature of spawning, condition factor (K) and gonadosomatic index (GSI) were utilized. The spawning in this species is protracted and lasts from October - December, and from January - May on a reduced scale. Relation of fecundity to length and fecundity to weight when tested statistically showed better correlation in 1979 and 1980, than in the rest of the years and the analysis of variance showed different rates of egg production during different years. Studies on fecundity showed that generally 66,000 eggs are released by each individual in the spawning act.