Observations of the effects of the conditions of the Paca River (Caraguatatuba, São Paulo) on the population density of the gastropod Pomacea sp. (Ampullariidae) Beverllyn Marinho Franco, Judith Font Batalla

Abstract

The body of water known to the population as the Paca river (Caraguatatuba-SP), presents a large amount of macrophytes, which is contaminated by domestic and even commercial effluents, causing damage to both the body of water and residents living near as well as for fauna and flora. Thus the work aimed at a study of the biology of Pomacea SP, genus of gastropod found in the river in large quantities. It was observed that despite the level of pollution of the river, a high population density survives in these adverse conditions. In the laboratory, spawning hatching time ranged from 9 to 10 days. In total, 23 spawnings were used during the laboratory research, all at night. Pomacea sp can feed on the spawning of Physa sp., From Biomphalaria sp. and other dead individuals.