期刊
HYDROBIOLOGIA
卷 529, 期 1, 页码 49-58出版社
SPRINGER
DOI: 10.1007/s10750-004-4946-4
关键词
mud crab; Scylla paramamosain; variability in larval stages; additional Zoea-VI; dietary conditions; larval morphology
Mud crabs, Scylla spp., are commercially important in many Indo-Pacific countries. The larval development of mud crabs has been reported previously as five zoeal and one megalopal stages. This paper reports larval rearing experiments that revealed variability in larval developmental stages in the mud crab Scylla paramamosain, one of four mud crab species. In addition to normal five zoeal stages, an alternative pathway of developing through six zoeal stages was observed for the crab. There were evidences suggested that the appearance of the additional Zoea-VI larvae was associated with unfavourable dietary conditions, including poor quality of diet, inadequate quantity of dietary supply and a period of starvation for newly hatched larvae. Based on exuviae and larval specimens, the morphology of the additional Zoea-VI larvae was described.
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