[Invasive-species] Informations about crayfish species

[Xavier Mestdagh]

Hi,

I've just a question about exotic crayfish : why Astacus leptodactylus,
Oronectes limosus, Pacifastacus leniusculus and Procambarus clarkii aren't
in the aliens species list ?

Thanks in advance, and congratulation for this beautiful website !

Xavier Mestdagh
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