Among the over 3,000 species of catfish is the wels catfish of central Europe and central Asia. Other species include the glass catfish of Southeast Asia, the bushymouth catfish of South America and the upside-down catfish of central Africa.
The upside-down catfish, also called the bugeye squeaker, lives in rivers and streams, where it swims upside down. It does this to help it feed on larvae and algae on the undersides of rocks and plants.
The glass catfish's transparent body is thought to be a form of camouflage. The fish achieves this because its flesh is filled with oils that make it translucent, revealing its internal organs and skeleton. Like other catfish, it has the barbels that give the catfish its name.
The wels catfish is a huge animal that can grow up to 13 feet long and weigh over 800 pounds. It's a solitary fish that is found at the bottoms of lakes and rivers.
In contrast with the wels catfish, the bushymouth catfish is a small catfish that can grow up to 8 inches long. It makes an attractive aquarium fish. It gets its name from its tiny, branched tentacles around its mouth. The male has more of these tentacles than the female and takes care of the fry.