The freshwater snail Physa fontinalis was used as a bioindicator to study the effects of the herbicide Paraquat (PQ) in laboratory assays. The test solutions used, 0.125, 0.25, and 0.5 mg/l PQ, were in the range of the concentrations recommended for aquatic weed control. The study was carried out in two stages to determine the influence of PQ on the ovipository activity of Physa fontinalis, and the histological effects on these snails. Specimens exposed to PQ continued to be reproductively active, but the number of egg masses and eggs laid decreased significantly. Mortality was almost the same in all the experimental lots, but was significantly related to the production of egg masses only in the controls. The histological analysis showed a clear trend among PQ concentrations and degenerating oocytes, but no visible effects on the male sex-line were observed. By interfering with fertility, PQ has an action that may go well beyond its lethal effect on individuals, suggesting that this herbicide should be strictly regulated in weed control programmes. Moreover, since PQ was observed to interfere with the reproductive process, its endocrine disrupting action must not be excluded.
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