9. Walking catfish (Florida)
The walking catfish is native to Southeastern Asian countries, but has become invasive in southern Florida, and is at risk for becoming invasive in other states. It was introduced to the U.S. in the 1960s, probably as a result of the aquarium trade, and after attempts to farm the fish commercially here. The walking catfish is unusual because it is able to live out of water for short periods, and even to move short distances over land. This allows it to take advantage of flooded fields, canals, and even rainy days to expand its territory. This fish has previously invaded several eastern coastal states and Nevada, but as of 2011, has been eradicated from all locations except for Florida. Like many types of aquatic invasive species, the walking catfish is a voracious eater and will consume a wide variety of foods including small fish, insects, plant material and detritus. Its eating habits may help it to outcompete other predators in ponds and it can quickly establish itself as the dominant species in new areas. This type of catfish is viewed as a delicacy in much of Southeastern Asia, and especially in India — and can be eaten as any other type of catfish. Contaminants unknown, no incidents reported.