Another Florida exotic. The Vermiculated Sailfin Catfish is a native of South America, where it lives in sluggish rivers and feeds by scraping algae off the rocks and logs with its unique suction-cup mouth. As with the Common Pleco, this behavior has made it invaluable to aquarium keepers, who utilize this fish as a natural form of algae control. Inevitably, some of these aquarium fishes escaped or were released and they survive as exotics in South Florida and Texas. This is the more common variety of the two Suckermouth Catfishes in Florida.