Gar.

Gar is a general term for large fish of the genus Lepisosteus in the family Lepisosteidae, native to North America or Central America. It is closely related to bowfin fish and belongs to the order Holostei. It mainly lives in freshwater, but some species can enter brackish water or even salt water. It has sharp teeth and is a large, ferocious fish that is carnivorous. Gar meat is edible, but its eggs are poisonous. In Shanghai, Chongqing, Shaoguan and other places in China, gar, as an alien invasive species, poses a great threat to other local fish and may destroy the local ecosystem.

Gar is an alien invasive species native to North America. Its eggs are highly poisonous and cannot be eaten. Adult gars can reach more than 3 meters in length. They are large, carnivorous and ferocious fish that will attack all other fish they meet. It is a notorious "water killer" along with the "piranha" and one of the "top ten most ferocious freshwater fish in the world".