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Some Aspects Of The Biology Of Shortfin Scad (Decapterus macrosoma) Caught From The Waters Off East Coast Of Peninsular Malaysia

By Wijopriono, Mohd. Zaki Mohd. Said, and Priyanto Rahardjo

Some aspects of the biology of shortfin scad (Decapterus macrosoma) caught from the waters off East Coast of Peninsuar Malaysia have been studied. This aspects include maturity, spawning, size at maturity and fecundity. Maturity and spawning of this species were investigated using microscopic characteristics of the gonad for determining maturity stage and gonadosomatic index (GSI). Size at maturity and fecundity were obtained by Spearman-Karber method and gravimetric method, respectively. The fish reached maturity in September suggesting that spawning probably occurred in September or October. Lengths at first maturity for males and females were 20.50 cm and 20.18 cm, respectly. Observation of the spent females indicated that the ripe eggs from different parts of the ovary were spawned in the same period. The fecundity ranged from 58,000 eggs to 76,000 eggs.

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