October 30, 2026 — The Bristol Bay red king crab fishery was once one of the largest and most valuable crab fisheries in the world, but it collapsed in the early 1980s. Managers established closure areas to help the population rebound, but the boundaries of these closure areas are fixed and cannot adapt to changing environmental conditions and shifting crab distributions. Previous research has documented northward movements of the Bristol Bay red king crab population. Changes in their seasonal migration patterns may limit the effectiveness of static closure areas like the Red King Crab Savings Area.

In response to this pressing management need, a new satellite tagging study tracked and modeled movements of mature male red king crab in Bristol Bay from late spring through the fall during 2021–2024. The research team’s “movement models” predicted that red king crab generally moved to the west or southwest by the fall—into deeper and cooler areas in central Bristol Bay. In years with warmer bottom water temperatures, crab moved further west. The model’s predictions were validated by commercial catches from the fall Bristol Bay red king crab fishery and researchers are currently applying this approach to other seasons.

Future applications in the winter and spring may provide important insights about movements during mating and molting. These are the times of the year when the crab are more vulnerable. This information will help fishery managers evaluate current closure area boundaries and inform future boundary changes that may be needed to better align with present and projected seasonal migration patterns.

Read the full article at NOAA Fisheries