I studied and lived with these species in Punta Tombo Argentina. Their food source is known to be moving further north. But we also saw these catastrophic events from time to time where the juvies had a super high mortality rate in their first year away
That’s the weird part, because usually species will move to poles from climate change related stressors. The waters of coastal Patagonia have had issues with fishery mismanagement so that could explain the depleted stock. I have to talk to the researchers on the project to see if they’re learning more about the movement of the fish