Larval development of the kishi velvet shrimp, Metapenaeopsis dalei (Rathbun) (Decapoda : Penaeidae), reared in the laboratory

J.H. Choi, S.Y. Hong-2001

Fishery Bulletin, 99 (2) : 275-291  (from Current Contents)

Abstract :

The complete larval development of Metapenaeopsis dalei (Rathbun) is described from laboratory-reared larvae. The larvae were reared in a plastic container (20 L). Larvae from the first zoeal stage to the third zoeal stage were fed algae; larvae from the first mysis stage to the first postlarval stage mere fed newly hatched nauplii of Artemia. The nauplii of M. dalei hatched about 20 hours after spawning. The larvae passed through six naupliar, three zoeal, and three mysis stages before the postlarval stage. About 15 days (about 347 hours) were required from hatching to the first postlarval stage. Larval morphology of M. dalei is described and compared with those of other Metapenaeopsis spp. The first nauplius stage larva of M. dalei bears a chitinous conical protuberance on the mediodistal margin of the body. The third protozoeal stage larva has five dorsomedian abdominal spines on the abdomen. The morphological characters of the first postlarva are 43 scaphognathite setae on the maxilla, three scaphocerite spines on the outer margin of antenna, and sternal plate spines: 2,2,0,1,1.

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