Áreas da região lagunar Cananéia-Iguape suscetíveis de exploração pesqueira segundo diversos tipos de tecnologia: I - Pesca com cerco fixo

Resumen

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.