Did they throw the tuna into the evidence locker?
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Probably not. Fish cops usually take the fish to a dealer and sell it. Often they will have the buyer put down a lower weight on the fish ticket, while paying the cops for the actual weight. Guess who gets the difference?
With a bluefin tuna the price per pound can be astronomical. Think hundreds (or in Japan thousands) of dollars per pound.
Back in the day in Washington State, many a fish cop was able to afford an expensive new home and a Porsche for the garage.