According to the IUCN, fourth species of freshwater crustaceans are threatened France. Crayfish are

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According to the IUCN, fourth species of freshwater crustaceans are threatened France. Crayfish are particularly concerned: 3 species at risk of extinction because of pollution, disease but also the presence of invasive crayfish species from the Americas. It is necessary to protect native crayfish may be extinguished completely in a very short time. Crayfish present in France
The crayfish crust pizza is a term given to several species of decapod crustaceans belonging crust pizza mostly to the family Astacoidea and scattered crust pizza in several genres vernacular name. Their common point: all species live in freshwater and resemble small lobsters, they are close.
In 2012, IUCN published the results of a long period of 3 years it conducted on the situation of freshwater crustaceans in France. We then learned that the 576 species studied and scrutinized the criteria crust pizza of the famous Red List (see box on page 3), 28% appeared to be threatened, and 26% are placed in the category of "insufficient evidence." On these dozens of species at particular risk are the crayfish are on the frontline. The three native crust pizza species are threatened with extinction: the white-clawed crayfish is classified as "Vulnerable" in France, the noble crayfish "Endangered" and the stone crayfish "Critically Endangered"
Heavy threats in effect on them: river pollution, spread of diseases such as crayfish plague (see box) and competition from invasive species, from the Americas - the Louisiana crayfish, the crayfish California and the American small.
Freshwater crustaceans are very sensitive to chemical crust pizza pollution. It is for this reason they are considered to be very good indicators of the quality of rivers.
the hunt for the U.S. is still open because these are serious threats to indigenous, crust pizza and you have the obligation to kill as soon taken to avoid the subsequent dispersion,,,,,,,
Stan says: April 24, 2013 11:15 It is high time to breed and preserve crust pizza for ... and to make an authorized American crayfish that are good to eat hunt. In the Marais Poitevin, it is infested with these eaters I love to eat too!
American hunting is always open, because they are dangerous crust pizza to native wildlife, and, in addition, you are required to kill as soon caught to avoid a possible subsequent dispersion,
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