SYNOPSISWith the pury.'ose of obtaining data which could be useful for complementing invelltigations on estuarine biological oceanography, the authors carried out a survey on lhe distribution and volume of catch produced by fish-traps USl!.d by trf1.ditional fishermen in the lagoon region of Cananéia-Iguape (São Paulo, Brasil), mainly for catching mul/et. As many as 170 fish-traps w.ere initia/ly spotted and mapped in the whole region, some of which are concentrated in particular areas that seem to be points of more frequent pa~e ofmul/et and other fishes, accordinç to the experience and observations ofreJrional fishermen. In consequence ofthe dam recently buüt õ!ithe Valo Grande -an artificial canal coflich fOrrlUrly linked the RibeiraRiver to the lagoan system ofCananéia-Iguape -it is expected that the sea-water circulation within the /çgoon wl1l be intensified, with a consequent increase in the salinity rates ofits waters, which in tum will probably affect the ecological balance of ' 7T1Il!. The authors suggest that a continuous monitoring of the volume and composition of the commercial catch produced by the fish-traps ope. ating in the lagoan-region could eventua/ly offer useful data for detecting the alteratiom of distribution of the several different fish Ilpecies th.lt are found in the lagoon, in consequence of the foreseen changes in the salinity rates ofits waters. F M A M J J A
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