These aquatic predators kill every animal in their habitat.

invasive fish species in the world.

Humans are experts at helping species move from their native habitat into new territory. Sometimes, the new habitat suits the invader so well that the results are catastrophic for local species. This is true on land as well as in the water. Ecosystems around the world have been dramatically altered as fish species are shifted around, whether for commercial fishing stock or the aquarium trade. When the fish are let loose or escape, a cascade of changes often follows, sometimes causing significant deforestation, an upheaval in the economy, or the decline of species that live above water.

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