The introduction of non-native fish species can have far-reaching and undesirableSignal Crayfish (Pacifastacus leniusculus) ecological consequences for animal and plant communities in rivers and lakes.

Introduced non-native fish can have direct effects on native species, for example by predation, or can upset the natural ecological balance. Non-native fish can Zander (Stizostedion lucioperca) also 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 already harmed our native fish stocks.

 
 

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