Coast Guard assets and fishing vessels called off the search in the waters off Montauk on Tuesday night for a crew member believed to have fallen off a commercial fishing vessel Monday afternoon.

The man, 55, was last seen at 4 p.m. Monday and was reported missing a half-hour later by the Miss Shauna, a 51-foot commercial fishing vessel, while it was about 25 miles south of Montauk, the Coast Guard said. The commercial boat is from New Bedford, Massachusetts, the agency said.

“The crew presumed he fell overboard,” said Petty Officer Steve Strohmaier, based in Manhattan. The man was not wearing a life jacket, the Coast Guard said.

Authorities suspended the search at 9 p.m. Tuesday and do not plan to resume it, barring new information, the Coast Guard said.

An urgent marine alert was broadcast to the marine community, the federal agency said. The Coast Guard dispatched planes from Cape Cod and Elizabeth City, North Carolina, and a helicopter from Cape Cod. Coast Guard vessels from stations across the region were joined in the search by 10 fishing vessels, Strohmaier said Tuesday morning.

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Other details, including the crew member’s name, were not released.

The Miss Shauna has experienced five routine incidents of equipment failure since 2002, according to Coast Guard records. Most recently, in 2015, the vessel took on water 130 miles off Nantucket, but returned to port safely after the Coast Guard provided pumps.

The Coast Guard asks anyone with information to call Sector Long Island Sound at 203-468-4401.

With Stefanie Dazio