Abstract
The annual reproductive cycle and sexuality of Choerodon schoenleinii were studied histologically. The major spawning period persisted from February until May, spawning of individuals occurring almost every day during the most active period, being March and April. Relationships between TL and both Fecundity and batch fecundity were obtained. C. schoenleinii mature as females at about 24cm TL and exhibit protogynous hermaphroditism with monandric sexuality. Sex transition occurred from 40-64 cm TL, all fish larger than 65 cm TL being males. C. schoenleinii is closely sexually dichromatic, the body color changing from an initial greenish-yellow phase (female) to a terminal blue phase (male), in almost complete accordance with the sex transition.
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