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blue catfish

or blue cat

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noun
  1. a large freshwater catfish, Ictalurus furcatus, that is a popular food fish in the states of the Mississippi River valley.

Origin of blue catfish

An Americanism dating back to 1825–35
Also called blue channel cat, blue channel catfish.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018