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The detection of a possible genotoxic effect of surface water treated with disinfectants for potabilization is the aim of the present work. The Comet assay and the micronucleus test were applied in circulating erythrocytes of Cyprinus carpio. Young specimens (20-30 g) were exposed in experimental basins, built within the potabilization plant of Castiglione del Lago (Perugia, Italy). In this plant the water of the Trasimeno Lake is treated and disinfected for potabilization before it is distributed to the people in the net of drinkable water. A continuous flow of water at a constant rate was supplied to basins; the water was continuously treated at a constant concentration with one of the three tested disinfectants (sodium hypochlorite, peracetic acid and chloride dioxide), one control basin being supplied with untreated water. Three sampling campaigns were performed:

The aim of this study was to gather more informations about the biological characteristics of Procambarus clarkii and to investigate the reasons of its rapid expansion in Lake Trasimeno. Specimens of both sexes (544 males and 624 females) were collected from October 2000 to November 2001. During the sampling period physical factors such as water temperature and hydrologic level of Lake Trasimeno were recorded. The study was conducted monthly in order to assess this species' reproductive period. 1,168 specimens were analyzed for colour, sex, weight, and length. The sexual maturation of gonads was investigated in females. The results of this study evidenced that the population is in expansion, showing that Lake Trasimeno is an optimal habitat for this species. Key-words:Red-swamp crayfish, Procambarus clarkii, growth, reproduction, Lake Trasimeno. 1 168 exemplaires ont été analysés selon la couleur, le sexe, le poids, la longueur et le degré de maturité des gonades a été relevé pour les femelles. Les résultats de cette étude ont mis en évidence que la population de Procambarus clarkii est en expansion et il semble que le Lac Trasimeno soit un habitat optimal pour cette espèce. BIOLOGIE DE PROCAMBARUS CLARKII (GIRARD, 1852) DANS LE LAC TRASIMENO RÉSUMÉ

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