Like all crayfish, animals are loners and are omnivorous, although their diet is mainly vegetarian can eat anything, from the roots and leaves rotting meat, including crayfish smaller than them.
Because the plague of red crabs American river that ravaged Europe , They have almost exterminated the noble crayfish Astacus astacus river, Swedish biologist Gunnar Svärdson went to the US. to find a crayfish that could replace European crayfish source. He found the crab signal and began to enter into the rivers and lakes of Sweden.
This was the beginning of the introduction of the signal crayfish ,not only several European countries, but also to Japan. .
In the next picture we can differentiate the left of the photo to the American signal crayfish and right the American red crab.
One notable difference between these two species is the size of their much larger clamps on the signal crayfish.
Crab eggs stored under the tail these are of a crab signal.
Unfortunately,The introduction of this signal crayfish has been neglected envarios countries without taking into account the fact that, While it is resistant to plague American River crabs can still act as a carrier. Thus, proliferation accelerates the eventual extinction of native river crab. The concern is that this could also be the case, both in Britain, Japan and Norway.
In the decade of the seventies in Spain native crabs disappeared because of the struggle intently-mitosis is a disease caused by a fungus that carry both signal crayfish as red imported both North America and they are immune.
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