The aim of this study is to explaine biology aspect of sardine (Sardinella longiceps) that is reproductive biology (sex ratio, gonad maturity, fecundity and spawning season) and growth (growth parameter, length-weight relationship and condition factor). The study was conducted in Sibolga bay during one mounth (August-September 1999). Sex ratio of sardine is balanced. The fish in condition immature most few than mature fish. Fecundity is between 28.973 - 93.573 eggs, with spawning season in July-August. Growth model L =317,6 {1 - e" "-21
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