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The Common Carp is a large freshwater fish, growing up to 1m in length and 24 kg in weight. Both colour and scales are variable in this species. It can be found in much of South Africa, and has had a significantly negative impact on the environment. Competition with other organisms for the same food sources has resulted in biodiversity loss.
This crayfish can grow 10-20cm but some individuals attain a length of 30cm. Colour is variable and depends on water quality, but most take on a greyish-blue to vivid metallic blue colour. This is not an indigenous species and may have negative impacts on our wetland systems by competing against indigenous species. The burrowing activity may cause damage to dams and riverbanks.