Could very well be. Well spotted.

Whales found in that area are Southern Right Whales which average around 15-18 metres:



and the Humpback Whale which average around 12 - 14 metres:



But if it is a whale, I'd go for the Southern Right, because of the apparent lack of those colossal pectoral fins.

It'd be a real shame is if it's any kind of whale though, as there aren't as many left in the world as we'd like.