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.Learn More
Cnidarians have bilateral symmetry, which is a characteristic that distinguishes cnidarians from other organisms. Cnidarians have complex levels of tissue organization and lack of structured internal organs. Additionally, adult cnidarians derive from two distinct embryonic germ layers, which are the ectoderm and endoderm.Full Answer >
An example of mutualism in the ocean is the relationship between coral and a type of algae called zooxanthellae. The relationship is mutualistic because neither organism would be able to survive without the other.Full Answer >
Starfish, despite their crusty exteriors, are vulnerable to predators like crabs, sea otters, sharks and other starfish. A starfish injured by any of these predators can regenerate damaged or missing limbs, although gulls swallow starfish whole.Full Answer >
Most starfish, also known as sea stars, eat by prying open the shells of prey such as clams or oysters with their arms, pushing their stomachs out their mouths and into the prey's shell, partially digesting the animal and then pulling their stomachs back into their mouths. Starfish that don't have suction disks swallow prey whole and afterwards eject undigested parts.Full Answer >