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1.
A fisheries law enforcement officer
Police officer = regular cop
Fisheries officer = fish cop
by CMBC January 23, 2012
 
2.
Prison Term.

New correctional officer, fresh out of the academy.

While a new inmate is considered a "fish" the similar term Fish-cop is used for new officers.

See Fish
See that new fish cop? He thinks he's Bad-Ass.
by Kuerno May 23, 2008