A baby whale’s inaugural cruise through Big Apple waters ended in tragedy over the weekend after its slashed and bloodied body beached on the shores of New Jersey.

The still-breathing behemoth suffered at least two excruciating nights trapped on a Long Beach Island sandbar before it succumbed to its injuries — just hours before rescuers planned to deliver a euthanasia injection.

“Our entire team is deeply saddened by every deceased animal that we investigate, but the ones that hit the hardest are animals like this young whale who never got the chance to contribute to their species,” the Marine Mammal Stranding Center, based in Brigantine, wrote on Facebook Monday. 3

The doomed juvenile humpback was first spotted off the coast of Holgate around 3 p.m. Friday — two weeks after ma

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