Morphological changes of ovaries of the pacu, Piaractus mesopotamicus (Holmberg, 1887) in captivity

Authors

  • Elizabeth ROMAGOSA Pesquisador Cientí­­fico - Seção de Biologia Aquático-  Divisão de Pesca Interior Instituto de Pesca - CPA/SAA http://orcid.org/0000-0001-5363-4128
  • Massuka Yamane NARAHARA Pesquisador Cientí­­fico - Seção de Biologia Aquático-  Divisão de Pesca Interior Instituto de Pesca - CPA/SAA
  • Heloisa Maria GODINHO Pesquisador Cientí­­fico (Bolsista do CNPq) -  Diretor Geral Instituto de Pesca - CPA/SAA
  • Patrícia de PAIVA Pesquisador Cientí­­fico - Assistência Técnica de Direção -Instituto de Pesca - CPA/SAA
  • Francisco Manoel de Souza BRAGA Prof. Dr. Universidade Estatual Paulista Júlio de Mesquita Filho - Campus de Rio Claro - SP

Keywords:

Piaractus mesopotamicus, morphology, ovaries, captivity

Abstract

This study refers to the morphological changes of ovaries of pacu, Piaractus mesopotamicus, during its reproductive cycle, reared in three ponds of 1,000 m2 each one. The research was performed in the Aquaculture Center of Jupiá - CESP, SP, from March, 1984 to February, 1986. The oocytes can be divided into five development phases: chromatin-nucleolus, perinucleolus, cortical-alveolus (yolk vesicle), vitellogenic, and ripe. According to the macro and microscopic morphological changes of the ovaries, a scale of four stages has been elaborated: Resting, Maturation, Mature, and Regression.

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Published

2018-09-10

Issue

Vol. 20 No. único (1993): BOLETIM DO INSTITUTO DE PESCA

Section

Scientific Article