Abstract
was investigated based on the samplescaptured in South Korean waters from January 2008 to December 2009. Gonadosomatic index began toincrease in December , and reached maximum between January to March . After spawning it began todecrease from May . Reproductive season was estimated to January -April , with peak in February . Fecunditywas proportional to the size of the female , with the clutch size varying from 170,000 eggs in the smallestfemale (total length , 28.9 cm ) to 1,300,000 eggs in the largest (total length , 41.5 cm ). Size at 50% sexualmaturity (TL 50), determined from mature females , was 28.8 cm . Annual reproductive cycles of this speciescould be divided into six successive stages ; immature stage (May -October ), nucleolus stage (November -January ), yolk vesicle stage (January -February ), vitellogenic and ripe stage (January -April ) and spent stage(April -May ).Keywords: Maturation , Spawning , Annual reproductive cycle , Shotted halibut , Southern Korean waters
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