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Reproduction of the fish community of Passa Cinco stream, Corumbataí River sub-basin, São Paulo State, southeastern Brazil.
Rondineli, G R; Braga, F M S.
Affiliation
  • Rondineli GR; Departamento de Zoologia, Instituto de Biociências, Universidade Estadual Paulista, Rio Claro, SP, Brazil. giu@rc.unesp.br
Braz J Biol ; 70(1): 181-8, 2010 Feb.
Article in En | MEDLINE | ID: mdl-20231976
The aim of this work was to evaluate the reproduction (verifying if there was reproductive activity and, if so, with what intensity) of the most abundant species of the fish community in Passa Cinco stream, in relation to the dry and wet season periods and to the longitudinal gradient, through the application of the reproductive intensity index (RII). The sample collection was carried out during one year with six samplings (May, July, September and November 2005, and January and March 2006) in five different points of Passa Cinco stream, contemplating sites of orders two to six. The following fishery equipment was used: a sieve, electric fishery equipment, gill nets and fish-traps. The values of the reproductive intensity index for the dry period were 2.86 and for the wet season 3.17, which indicates the wet season (November to March) as the period when most of the species reproduced. The values of the index for collection point were: 0.78 for site 1, 3.56 for site 2 and 2.89 for site 3. Site 2, which presented the highest value, was the main reproduction place for most of the species. The adults' prevalence in the analysed species suggests, in an isolated way, that those species use the system as a reproduction area. However, when that information was crossed with the values of RII, when intermediate values were considered, it is possible to state that the system is used by the species as much as a reproduction area as a feeding area.
Subject(s)

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Reproduction / Fishes Type of study: Risk_factors_studies Limits: Animals Country/Region as subject: America do sul / Brasil Language: En Journal: Braz J Biol Journal subject: BIOLOGIA Year: 2010 Document type: Article Affiliation country: Brazil Country of publication: Brazil

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Reproduction / Fishes Type of study: Risk_factors_studies Limits: Animals Country/Region as subject: America do sul / Brasil Language: En Journal: Braz J Biol Journal subject: BIOLOGIA Year: 2010 Document type: Article Affiliation country: Brazil Country of publication: Brazil