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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.
Bony fishes can swim forward and backward.   Gills:   Both cartilaginous and bony fish have gill slits but the bony fish also have gill covers (an operculum).   Reproduction:   In the Chondrichthyes the males have claspers which assist in copulation. Fertilisation is internal-almost unique among fish. Scales:   Cartilaginous fish have large scales called placoid scales. These have a bone like base embedded in the skin and a backward projecting enamel covered dentine spine. The whole thing has a central pulp cavity (rather like the structure of teeth). The epidermis and dermis form placoid scales.