Gonadal characterization of the Amazonian fish Serrapinnus kriegi (Characidae: Cheirodontinae)

Abstract The knowledge of the testicular and ovarian morphology a particular fish species is paramount importance. Such analyze enables development studies techniques aiming improvement their reproduction, management, commercialization even conservation. This study performed characterization ornamental Amazon Serrapinnus kriegi. A total three males females had gonads analyzed by optical microscopy. Females present ovaries filled with oocytes in asynchronous development, indicating partial spawning species. Moreover, micropyle micropilar cell formation was observed primary growing oocytes, representing precocious oocyte development; zona radiata final vitellogenic thicker than other related species, evidencing better protection to embryos function waters’ turbulence that characterize it sites Amazonian streams. male specimens’ anastomosed tubular testes unrestricted spermatogonia spread along entire seminiferous tubules. data elucidate dynamic spermatogenesis oogenesis an through description female germ cells development.