Abstract
There are a number of reports documenting skeletal development in groupers, but surprisingly little is known about muscle development. We have documented muscle development in the seven-band grouper Epinephelus septemfasciatus (Thunberg), focusing primarily on the cranial muscles from 0 days post-hatching (dph) to 28 dph, using a modified whole mount immunohistochemical staining method. The eye muscles developed first followed by the cheek muscles, which completed development prior to first feeding. The muscles associated with the opercle and the levator internus 1 developed gradually and were not linked to first feeding. Later, between 12 and 16 dph, the muscle composition in the dorsal branchial arches changed to the adult form. We observed a number of cultured larvae that exhibited abnormal musculature in the body and jaw. Our results provide the first documentation of muscle development in larval seven-band grouper. This information can be used to detect abnormalities during development and provide a marker to assess the effect of changes in larval rearing techniques.
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