DFO and ECCC scientists consider climate change a potential factor, since the planktonic species the whales feed on are temperature dependent and the whales migrate to food sources.

You probably didn't know, but the waters off the east coast of the U.S. from Long Island Sound to the Gulf of Maine is one of the fastest-warming regions of the ocean, which has caused the collapse of the Long Island and Massachusetts lobster and shrimp fishery as populations shift to colder northern waters (for now).