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originally posted by: rickymouse
Somehow the fish adapted to the colder water. It has not gotten that much warmer in that area, climate change is not involved. Someone put the fish into that lake, probably someone being humane who did not want to kill their fish. Fish can adapt, saltwater fish can sometimes become freshwater fish and vice versa. They can adapt to things as needed.
originally posted by: Kurokage
I don't think it's an infestation but and it's a big but, if someone has dumped a tank full of piranha into a small lake then it could have a impact on the local eco system short term.