THE LARVAL DEVELOPMENT OF SCYLLA SERRATA(FORSK?L)

1. Scylla Serrata (Forsk?l) has been successfully reared from the first zoealstage to the tenth crab stage in the laboratory, and all the larval stages aredescribed in detail. 2. Eggs hatched as first zoeae; and the "pre-zoea" stage was not observed. 3. Five zoeal stages and one megalop stage were observed in the completedevelopment to the first crab. 4. The number of hairs or spines on the maxillule, maxilla and maxillipedsincreased with each larval stage and may serve to distinguish between the zoeaeof different stages. 5. Development from the first zoeae to the first crabs required 23-24 daysat temperatures 25. 7-29.2℃. 6. Development from the first young crab stage to the tenth young crabstage required 123 days at temperatures 18.0-31.5℃. 7. In the first three young crab stages, moulting took place every 4 days;in the five subsequent stages, the time between two successive moultings length-ened from 5 to 12 days; and in both the ninth and the tenth stages, the timewas as long as 30 odd days. 8. The growth intensity of the crab diminished with age.