Abstract
The reproductive biology of Lethrinus nebulosus was studied. Oogenesis of the fish were very much similar to that of Sparidae, Serranidae, i.e. yolk vesicles, yolk globules, nucleus migration, fusion of yolk globules and hydration successively occurred toward ovulation. From histological observations, in August and September, all ovaries were in primary growth phase, i.e. in early and late peri-nucleolus stage. Yolk accumulation began from October onward with the peak spawning March through June. Atretic ovaries were observed in June and July. GSI's transition coincides with the histologically observed gonadal developments, accordingly, taking the lowest during August and September, GSI gradually increases and gains the highest in March and April with the gradual decreases toward August. The minimum length of maturation was around 40cm in FL. The fecundity and FL relationship during the most fecund months, March and April, was expressed as Fecundity= 1.58×10-3×FL5.20. There was no relation of spawning about lunar periodicity. L. nebulosus exhibited juvenile hermaphroditism in which sex was determined as 24-30cm.
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