Populational biology of tilapia, Oreochromis niloticus, of Guarapiranga Reservoir, São Paulo í  II. Reproduction dynamics

Authors

  • Geraldo BARBIERI Pesquisador Cientí­­fico - Centro de Estudos de Bacias Hidrográficas-Instituto de Pesca - SAA
  • Maria Teresa Duarte GIAMAS Pesquisador Cientí­­fico - Centro de Estudos de Bacias Hidrográficas-Instituto de Pesca -SAA
  • Alcides Ribeiro TEIXEIRA FILHO Pesquisador Cientí­­fico - Centro de Pesquisa em Aquicultura -Instituto de Pesca -SAA
  • Elmar Cardoso CAMPOS Pesquisador Cientí­­fico - Centro de Pesquisa em Aquicultura -Instituto de Pesca -SAA
  • Harry VERMULM Jr. Pesquisador Cientí­­fico - Centro de Estudos de Bacias Hidrográficas-Instituto de Pesca -SAA

Keywords:

reproduction, spawning, first maturation, Oreochromis niloticus, Reservoir

Abstract

Aspects of the reproduction of Oreochromis niloticus Linnaeus, 1757, of Guarapiranga Reservoir during the period of August 1996 to July 1997 were investigated. The reproductive period was determined analyzing the maturation curve, established by the variation of the gonadosomatic index, relative frequency of the maturation stages and condition factor. The reproductive period extends from September to December, and the spawning is of the fractioned type. The size of the first sexual maturation was estimated in 76 mm, corresponding to the first year of life.

Published

2018-10-27

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