More likely the lax regulations on sewage outfalls in most Western nations are to blame, not "climate change."
You're probably thinking, "Wait, sewage outfalls into the ocean? Isn't that illegal?" It used to be. It has quietly been overlooked until it has become a default right of municipal governments in many major Western cities including Sydney. When civil authorities were brighter and more conscious of disease hazards they used to strictly regulate it, using it only for emergency releases. It gradually came back into vogue as a regular occurrence as the majority of the population has become dumb as stumps, city bureaucrats included. One of the primary responsibilities of government is to regulate public health to protect from epidemics and this is a classic case of failure. The poor whales get told it is all due to climate change. Wait, we should put Brawndo on it, the thirst mutilator. If we mix that in with the sewage the whales will get ripped even as they get infected with Toxoplasmosis.