Matthew Clark, 29, stole the 13 lb bass from the aquarium in St. Peter Port in Guernsey and used it to win the £800 first prize.
The town’s magistrate was told the fish took top honours at the Bailiwick Bass Club competition in July 2012.
Clark, of St. Sampson, admitted theft and fraud at an earlier hearing.
He had initially denied stealing the fish from the aquarium in La Vallette, but later changed his plea.
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