"River Catfish, River Catfish Pictures, River Catfish Facts - National Geographic." Animals, Animal Pictures, Wild Animal Facts - National Geographic. Web. 05 Nov.
These unique fish have the nickname "iridescent shark catfish," a seemingly ill-suited comparison for a toothless, freshwater fish. The nickname arises from its tendency to swim close to the surface, raising its dorsal fin above the water. As for iridescence, river catfish have no scales, but their delicate skin is covered with a protective layer of slime that gives them a shiny glow.
This site tells you all kinds of information about different kinds of catfish. It tells me about a catfish that has the nickname "shark catfish". It also says that they have no scales.
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