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Keeping or releasing non-native crayfish and fish in England and WalesThe introduction of non-native fish and crayfish species can have far-reaching and undesirable ecological consequences for animal and plant communities in rivers and lakes. Introduced non-natives can have direct effects on native species, for example by predation, or can upset the natural ecological balance. Also non-native species can introduce novel diseases and parasites to which our native populations may have no resistance. Zander and signal crayfish are good examples of non-native introductions that have harmed our native fish stocks. Please choose the fish or crayfish section for more information. |
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