Freshwater fish
Freshwater fish have also spread. Due to sport fishermen, species like trout, bass, and other fish have been introduced to lakes and streams in Hawaii . Also, people released pet fish like guppies, suckermouth catfish, and swordtails in local bodies of water. The suckermouth catfish burrow into the ground, thus harming the local wildlife. Even seemingly harmless guppies can spread disease to native gobies.