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Not AvailablePenaeus monodon, the giant tiger prawn, has spawned in the Narakkal Prawn Culture Laboratory of the CMFRI and larvae have been reared to the juvenile stage. At a rearing temperature of 26.5°C to 28.5°C the nauplii hatched out of the eggs 16-17 hours after spawning; the nauplius stage lasted 40-55 hours; the duration of protozoea stage was 4i-6 days and the mysis stage lasted for 3-6 days. The larve passed through 6 nauplius, 3 protozoea and 3 mysis substages before becoming postlarva 1. The detaile:! structure of the larval substages is described and illustrated in this paper.Not Availabl