Spotting a 400-pound tuna in the Massachusetts seaport of Gloucester, known as America's oldest seaport, is not unusual. But finding a headless tuna in the woods is a bit odd.

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State Environmental Police and federal fisheries regulators are trying to figure out who dumped the headless fish, which had to be hauled out of the trees by a tow truck.

Authorities won't say exactly when the tuna was found or who tipped them off.

But Ally Rogers, a spokeswoman for the National Oceanic and Atmospheric Administration Fisheries Office for Law Enforcement, tells the Gloucester Daily Times that the fish was illegally harvested.

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The tuna season runs from early June to November.

Maj. Patrick Moran of the Environmental Police says he's never before had to investigate a tuna in the woods.