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Distribution of native crayfish populations in the catchment areas of the Rivers Fier, Cheran and Usses in Haute Savoie France Repartition des populations decrevisses autochtones sur les bassins versants du Fier, duCheran et des Usses en Haute Savoie France


, : Distribution of native crayfish populations in the catchment areas of the Rivers Fier, Cheran and Usses in Haute Savoie France Repartition des populations decrevisses autochtones sur les bassins versants du Fier, duCheran et des Usses en Haute Savoie France. L'Astaciculteur de France. Mars; 74: 2-6

A study of the distribution of native crayfish (white clawed crayfish Austropotamobius pallipes and noble crayfish Astacus astacus) has been made in the catchment areas of the Rivers Fier, Cheran and Usses in Haute Savoie. Bibliographic synthesis count about 36 historic sites. After fields investigations (night prospections), only 16 sites were recovered in all the bassins: 10 in the Fier catchment area, 3 in Cheran and 3 in Usses. The sites were classified in 3 types according to the state of their populations: 8 sites are considered as endangered, it means that their populations dramatically decrease; 5 were in good way to sustain their populations and 3 sites were recognised as non typical. Among these 3 particular sites, one is surprisingly sheltering noble crayfish (arrived in the river from a pond where it has been acclimatized some years before). Detailed study of crayfish populations would allow the authorities to prepare management measures in order to save the native crayfish in Haute Savoie.

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