UMA REVISÃO DAS FASES DE DESENVOLVIMENTO GONADAL DE PIRARUCUS Arapaima gigas (Schinz, 1822)

K. Lopes, H. L. Queiroz

Abstract


In this work we analyzed the morphological development of gonads of Arapaima gigas for the determination of a macroscopic scale of gonadal development, with the objective to apply this scale as a tool for the improvement of pirarucu fisheries management systems. The criteria used for this macroscopic analysis of gonads were color and degree of turgidity (or hardness) of the organs, existence of peripheral blood supply, diameter of oocytes and presence/absence of visible semen. Both sexes have only one functional gonad, located on the left side of the abdominal cavity. For the macroscopic scale of gonad development, six stages of ovary development were described: Stage I (Immature), Stage II (Initial maturation), Stage III (Advanced maturation), Stage IV (Mature), Stage V (Spent) and Stage VI (Resting). The macroscopic scale of gonadal development for males is composed of three different testicular stages. Stage I (Immature), Stage II (Maturation), and Stage III (Mature). The scale of gonadal maturation for females described in this research can be used as a discriminatory tool of gonad developmental stages in the field, and can be used to support monitoring programs of the reproductive state of the animals, in management systems of pirarucu fisheries.

Keywords


Pirarucu, Biologia reprodutiva, Desenvolvimento gonadal; Pirarucu, Reproductive biology, Gonadal development



DOI: https://doi.org/10.31420/uakari.v5i1.53