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Unlike cats and dogs, whose whiskers are made of hair, catfish have special whisker-like feelers made of skin. Each barbel is loaded with tiny taste buds and special olfactory sensors to help the fish smell. Catfish tend to live in dark, murky waters where their vision isn't very useful.
A cartilaginous fish's skin is covered in placoid scales, or dermal denticles, tooth-like scales different from the flat scales (called ganoid, ctenoid or cycloid) found on bony fish.ifferent shark species may have different numbers of gill slits. Cartilaginous fish may also breathe through spiracles, rather than gills. Spiracles are found on top of the heads of all rays and skates, and some sharks.