Rescuers fear he won't survive.
A beached baby humpback whale was still clinging to life after two attempts to sedate it failed.
Two darts shot into its lower body failed to sedate it for euthanization.
The agency's regional marine mammal stranding coordinator, Mendy Garron, said the whale may be in shock.
The young whale was found stranded Tuesday on the eastern Long Island beach.
Charles Bowman, president of the Riverhead Foundation for Marine Research and Preservation, said it was already dying when it came to shore.
He called the situation "heartbreaking.''