Fish that swims upstream

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Possible Answers: SHAD.

Random information on the term “SHAD”:

USS Carbonero (SS/AGSS-337) was a Balao-class submarine, the first ship of the United States Navy to be named for the carbonero, a salt-water fish found in the West Indies. Her keel was laid down on 16 December 1943 by the Electric Boat Company of Groton, Connecticut. She was launched on 19 October 1944 sponsored by Mrs. S.S. Murray, and commissioned on 7 February 1945 with Commander Charlton L. Murphy, Jr. in command.
Taken from Wikipedia