Lifeguards spotted the carcass off Long Branch on Saturday afternoon.
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Authorities cleared the waters along five beaches until the mammal washed ashore next to Imperial House Beach.
The Atlantic Lifeguard Alliance says come Sunday morning, it will coordinate with local agencies to safely remove the carcass.
Dozens of whales and dolphins have washed ashore in New York and New Jersey this year.
Scientists say many are killed by ships or debris.
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