Marine biologists trying to free a 25-foot humpback whale mired on a sandbar off Long Island are growing concerned about the welfare of the animal, which appears to be ill.

The whale, estimated to weigh as much as 20 tons, got stuck in Moriches Bay over the weekend.

An official with the National Ocean and Atmospheric Administration Fisheries said that the whale is probably suffering from internal injuries and that attempts to forcibly remove it could subject it to a “significant amount of stress.”

“The animal’s well-being is the first priority,” Mendy Garron said Tuesday, the Long Island Press reported.

Gov. Cuomo on Tuesday urged the National Ocean and Atmospheric Administration to do “everything possible” to save the whale.

“As a fisherman and boater, the Governor knows the Moriches Inlet and believes it may be possible to get the whale to deeper water,” Cuomo’s press secretary, Dani Lever, said in a statement.

“He will provide any equipment necessary from the Department of Environmental Conservation to effectuate the move.”

Experts from Cape Cod and a whale veterinarian from North Carolina have been deployed to assist in medical intervention.

As a safety precaution, officials have advised people to avoid approaching the whale.