Ictiofauna do Córrego Rico, bacia do rio Mogi Guaçu, alto Paraná
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Data
2010-06-29
Autores
Takahashi, Erico Luis Hoshiba [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O Córrego Rico é um riacho do alto Paraná de importância considerável para a região de Jaboticabal, Estado de São Paulo. No seu percurso é utilizado em abastecimento público, sofre descarga de esgoto e atravessa lavouras de cana de açúcar até desaguar no rio Mogi Guaçu. O objetivo do presente trabalho foi estudar a ictiofauna do Córrego Rico. Durante dois anos (agosto de 2007 até junho de 2009) foram realizadas coletas padronizadas bimestrais em diferentes trechos do Córrego Rico. No primeiro ano foi utilizada metodologia e equipamentos de pesca objetivando caracterizar a ictiofauna e comparar a eficiência dos métodos de coleta. No segundo ano a metodologia e equipamentos de pesca foram modificados buscando explorar padrões temporais e espaciais dos peixes. A estrutura populacional e a reprodução do caracídeo Steindachnerina insculpta também foram estudadas, visto a sua grande abundancia neste riacho. Foram coletadas 49 espécies no primeiro ano e 58 no segundo. Os métodos de coleta mais eficientes foram os ativos (arrasto e a peneira). A assembléia de peixes foi dividida em três partes: trecho superior, médio e inferior. Sugere-se que uma barragem existente no trecho médio do riacho pode ter causado impacto na assembléia de peixes. Diferenças sazonais na estrutura da assembléia de peixes foram observadas somente no trecho inferior. Steindachnerina insculpta foi abundante no trecho mais próximo a nascente e seu período reprodutivo ocorreu entre outubro e dezembro
Córrego Rico stream is a tributary from Paraná River very important to the region of Jaboticabal in São Paulo State, Brazil. It is used for public supply, receives residual waters and runs across sugar cane crops until discharge in Mogi Guaçu river. The aim of this work is to study the fish fauna of Córrego Rico stream. Standardized samples were taken bimonthly among August 2007 until June 2009. The methodology and equipments utilized in the first year were chosen in order to provide a general view of the fish fauna and to compare the equipments efficiency. In the second year the methodology and equipments were changed to look for temporal and spatial patterns in fish community. Population structure and reproductive patterns from Steindachnerina insculpta, was studied too. In the first year 49 species were collected. In the second year 58 species were collected. The best fishing equipments were the seine and sieve. The fish assemblage was characterized in three groups: upper, medium and low. A small dam, in the middle stretch, is causing impact in fish assemblage. Temporal differences were observed to the low stretches. Steindachnerina insculpta is abundant in the upper stretches and its reproductive period is between October and December
Córrego Rico stream is a tributary from Paraná River very important to the region of Jaboticabal in São Paulo State, Brazil. It is used for public supply, receives residual waters and runs across sugar cane crops until discharge in Mogi Guaçu river. The aim of this work is to study the fish fauna of Córrego Rico stream. Standardized samples were taken bimonthly among August 2007 until June 2009. The methodology and equipments utilized in the first year were chosen in order to provide a general view of the fish fauna and to compare the equipments efficiency. In the second year the methodology and equipments were changed to look for temporal and spatial patterns in fish community. Population structure and reproductive patterns from Steindachnerina insculpta, was studied too. In the first year 49 species were collected. In the second year 58 species were collected. The best fishing equipments were the seine and sieve. The fish assemblage was characterized in three groups: upper, medium and low. A small dam, in the middle stretch, is causing impact in fish assemblage. Temporal differences were observed to the low stretches. Steindachnerina insculpta is abundant in the upper stretches and its reproductive period is between October and December
Descrição
Palavras-chave
Peixe, Ecologia, Brasil, Neotropical, Riacho, Fish, Brazil, Neotropical, Stream, ecology
Como citar
TAKAHASHI, Erico Luis Hoshiba. Ictiofauna do Córrego Rico, bacia do rio Mogi Guaçu, alto Paraná. 2010. vii, 71 f. Tese (doutorado) - Universidade Estadual Paulista, Centro de Aquicultura, 2010.