Malacofauna límnica em pesqueiro de Itapecerica da Serra, São Paulo, Brasil: risco potencial na transmissão de helmintoses

This study aimed to carry out malacological samples of limnic mollusks present in a commercial fishing pond area on Itapecerica da Serra, Sao Paulo/Brazil, between July 2006 to June 2007. Furthermore, parasitological studies were also performed on specimens found. A total of 19,863 limnic mollusks were collected, represented by six species: Biomphalaria straminea Dunker, 1848; Melanoides tuberculatus Muller, 1774; Lymnaea columella Say, 1817; Pomacea lineata Spix, 1827; Physa marmorata Guilding, 1828 and Anodontites trapesialis Lamarck, 1819, being this the first report of the occurrence of this species in fish and pay systems of Itapecerica da Serra. The parasitological examinations performed in 5,766 mollusks were negative, however, the greatest abundance of B. straminea, intermediate host of Schistosoma mansoni Sambon, 1907, becomes a concern. Thus, the need for increasing the malacological surveillance in the region due to the diversity of hydric collections in the municipality that has precarious sanitation conditions, high migration flow and the presence of imported and autochthonous cases of schistosomiasis.