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Alien crayfish in Lake Geneva
Dubois J-P, Gillet C and Laurent PJ 
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Abstract
Three alien crayfish species, Pacifastacus leniusculus (Dana, 1852), Astacus leptodactylus Eschscholtz, 1823 and Orconectes limosus (Rafinesque, 1817) are replacing the naturally rare native Austropotamobius pallipes (Lereboullet, 1858) in Lake Geneva. Only P. leniusculus constitutes a significant marketable crop for some French commercial fishermen. The widespread O. limosus is considered as a plague because it damages the nets. Swiss and French regulations forbid or restrict the free sale of alien crayfish. This situation has to be changed and managed if the harvest increases as it can be expected. In the Bay of Thonon, where P. leniusculus is abundant, the macrophytes have strongly regressed. The impact of P. leniusculus on macrophyte abundance is discussed. Large perch (Perca fluviatilis) eat crayfish. O. limosus, active during the day, is relatively more predated than P. leniusculus.
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Dubois J-P, Gillet C and Laurent PJ. (1999). Alien crayfish in Lake Geneva. Freshwater Crayfish 12(1):801-810. doi:
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