Gulf of Alaska cod have been in steep decline due to rising ocean temperatures. Now, for the first time ever, federal fisheries managers are shutting down the lucrative fishery because of low stock.

A disaster declaration could make the fishery eligible for federal relief funds, although who specifically would receive money would be figured out later. 

Researchers from the University of Washington used 80 years of data to figure out how much warming fish could withstand. They discovered fish in the tropics are already living in water at the upper end of their threshold.

Scientists and fishermen have reported more unusual species in Alaska waters, including the subtropical mola mola, or ocean sunfish. It's likely because of warming sea surface temperatures.