Look what happened when the Cane Toad was introduced to sugar cane fields in Australia. They had no predators and multiplied exponentially , killing off most other species that shared the same diet. Now? They have to go out killing thousands of them to try and keep the pop. down. It was so bad that roads needed to be closed due to massive build ups of dead, decaying, and rotting frogs.
Also, other than just upsetting the ecosystem balance, introduced fish introduce diseases that arent naturally present. And if the introduced fish die, the disease does not necessarily die with them.
Also, other than just upsetting the ecosystem balance, introduced fish introduce diseases that arent naturally present. And if the introduced fish die, the disease does not necessarily die with them.