juvenile period

juvenile period
this period begins when fins are differentiated and the temporary organs of the larval period, q.v., are replaced by definitive organs. This transition from larva to juvenile may involve extensive changes in anatomy. Some larval organs persist while some organs only fully develop later in the juvenile period, e.g. scales, intromittent organs. Juveniles have a characteristic and distinct pigmentation and show rapid growth. The juvenile period ends when gametes mature

Dictionary of ichthyology. 2009.

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