Resumo
With the purpose of obtaining data which could be useful for complementing investigations on estuarine biological oceanography, the authors carried out a survey on the distribution and volume of catch produced by fish-traps used by traditional fishermen in the lagoon region of Cananéia-Iguape (São Paulo, Brasil), mainly for catching mullet. As many as 170 fish-traps were initially spotted and mapped in the whole region, some of which are concentrated in particular areas that seem to be points of more freauent passage of mullet and other fishes, according to the experience and observations of regional fishermen. In consequence of the dam recently built on the Valo Grande - an artificial canal conich formerly linked the RibeiraRiver to the lagoon system of Cananéia-Iguape - it is expected that the sea-water circulation within the lagoon will be intensified, with a consequent increase in the salinity rates of its waters, which in turn will probably affect the ecological balance of time. The authors suggest that a continuous monitoring of the volume and composition of the commercial catch produced by the fish-traps operating in the lagoon-region could eventually offer useful data for detecting the alterations of distribution of the several different fish species that are found in the lagoon, in consequence of the foreseen changes in the salinity rates of its waters.
ARTIGOS
Áreas da região lagunar Cananéia-Iguape suscetíveis de exploração pesqueira segundo diversos tipos de tecnologia. I - Pesca com cerco fixo
Eduardo B. Ramos; Jaques Gallo; Vicente M.A. Verrone
Instituto Oceanográfico da U.S.P., S. Paulo, SP, Brasil
SYNOPSIS
With the purpose of obtaining data which could be useful for complementing investigations on estuarine biological oceanography, the authors carried out a survey on the distribution and volume of catch produced by fish-traps used by traditional fishermen in the lagoon region of Cananéia-Iguape (São Paulo, Brasil), mainly for catching mullet. As many as 170 fish-traps were initially spotted and mapped in the whole region, some of which are concentrated in particular areas that seem to be points of more freauent passage of mullet and other fishes, according to the experience and observations of regional fishermen. In consequence of the dam recently built on the Valo Grande - an artificial canal conich formerly linked the RibeiraRiver to the lagoon system of Cananéia-Iguape - it is expected that the sea-water circulation within the lagoon will be intensified, with a consequent increase in the salinity rates of its waters, which in turn will probably affect the ecological balance of time. The authors suggest that a continuous monitoring of the volume and composition of the commercial catch produced by the fish-traps operating in the lagoon-region could eventually offer useful data for detecting the alterations of distribution of the several different fish species that are found in the lagoon, in consequence of the foreseen changes in the salinity rates of its waters.
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Bibliografia
- BESNARD, W. 1950. Considerações gerais em torno da região lagunar de Cananéia-Iguape. II. Diversos aspectos atuais da região lagunar. Bolm Inst. paul. Oceanogr., 1(2):3-28.
- BRASCONSULT, SÃO PAULO. 1966. Plano de Desenvolvimento do Vale do Ribeira e litoral sul. São Paulo, Departamento de Águas e Energia Elétrica - Superintendência do Vale do Ribeira, vol.5.
- D.H.N. 1977. Cartas de pressão à superfície. Rio de Janeiro, Ministério da Marinha - Serviço de Previsão do Atlântico Sul.
- MINIUSSI, I.C. 1959. Propagação da onda de maré em torno da Ilha de Cananéia. Contorções Inst. Oceanogr. Univ. S. Paulo, sér. Oceanogr. fís., (2):1-8.
- RADASEWSKY, A. 1976. Considerações sobre a captura de peixes por um cerco fixo em Cananéia, São Paulo, Brasil. Bolm Inst. Oceanogr., S. Paulo, 25(1):1-28.
- WAKAMATSU, T. 1975. A ostra de Cananéia e seu cultivo. São Paulo, SUDELPA/IOUSP, 141p.
Datas de Publicação
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Publicação nesta coleção
06 Jun 2012 -
Data do Fascículo
1980
