December 8, 2025 — A new study addresses one of the largest mass mortality events in recent marine history—the abrupt collapse of the snow crab population in the eastern Bering Sea. The research team was led by NOAA Alaska Fisheries Science Center fishery biologist Erin Fedewa. They set out to identify potential factors driving the increased mortality, population collapse, and recovery potential of Bering Sea snow crab.
Erin and her team measured snow crab energy reserves during and after the 2018–2019 marine heatwave and population collapse. This approach is the first of its kind for Bering Sea crab stocks. Findings show that warmer conditions and high population density led to energetic limitations—likely causing the snow crab population collapse.
their energy stores. They require more sensitive techniques to detect energy reserves beyond simple length-weight measurements. These techniques are often time-intensive and costly. Scientists have not routinely monitored energetic condition in Bering Sea crab populations to date.