STAGES OF EMBRYONIC DEVELOPMENT OF THE "MATRINXí" Brycon cephalus (PISCES, CHARACIDAE)
Keywords:
embryonic development, Brycon cephalus, matrinxã, fishAbstract
The "matrinxã†is an indigenous species from the Amazon Basin (Brazil). The development of oocytes is of the synchronic type, i.e., a large number of ovules are released at the same time. The egg development is characterized by a short embryonic differentiation and a larval period (26 ± 2.0°C). Metamorphosis ends practically 36 hours after fertilization and individuals reach fingerling stage with a structure similar to that of the adult, 48 hours after fertilization. The larvae hatch approximately 10-11 hours after fertilization, displaying slightly pigmented body, well evidenced eyes, traces of a digestive system, and first swimming movements. At the end of the first day of life, intense cannibalism is observed. Malformation of embryos is also observed in some individuals.
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