What are some examples of aggressive freshwater fish?

Freshwater Snakehead. The snakeheads are members of the freshwater perciform fish family Channidae, native to parts of Africa and Asia. Snakeheads are thrust-feeders that consume plankton, aquatic insects, and mollusks when small. As adults, they mostly feed on other fish (such as carp) or on frogs. read more

They are among the world's largest freshwater fish, reaching as much as 3 m (9.8 ft). The maximum recorded weight for the species is 200 kg (440 lb). The hard, corrugated surface of the outer layer, and the tough internal collagen layers work synergistically to contribute to their ability to flex and deform while providing strength and protection—a solution that allows the fish to remain mobile while heavily armored. read more

Even the most aggressive freshwater fish are beautifully rich in color and when keeping with suitable tank mates can be part of a great aquarium. Some people like aggressive fish and predator fish in their tanks. Aggressive fish tend to be territorial, fight over food, fight when mating, and attack other fish. read more

Freshwater fish are those that spend some or all of their lives in fresh water, such as rivers and lakes, with a salinity of less than 0.05%. This fish needs various physiological adaptations to keep their bodies’ ion concentration balanced. Freshwater fishes comprise 41% of known fish species. read more