Prosecutors say that in past years Mr. Winkler exceeded the limit on fluke, a spotted flat fish also known as summer flounder, by at least 200,000 pounds, and caught more black sea bass than was allowed. He is accused of making hundreds of thousands of dollars in illicit deals with of one of Montauk’s most venerable seafood institutions, Gosman’s. Gosman’s Dock boasts sprawling restaurants and retail stores in addition to its wholesale business. That could change soon: Gosman’s Dock is up for sale, priced at $45 million. His lawyers barred him from discussing the particulars of the case, or his motivations for fighting the government.

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Persons: Winkler, Bryan, Asa Gosman Locations: Long, Montauk