"Disease is one possibility," Daly told CBS News.
He also points to climate change. According to the National Oceanic and Atmospheric Administration, Alaska is the
fastest warming state in the country, and is losing billions of tons of ice each year — critical for crabs that need cold water to survive.
"Environmental conditions are changing rapidly," Daly said. "We've seen warm conditions in the Bering Sea the last couple of years, and we're seeing a response in a cold adapted species, so it's pretty obvious this is connected. It is a canary in a coal mine for other species that need cold water."