Walleye pollock eastern Bering Sea food web.

The Resource Ecology and Ecosystem Modeling Program (REEM) at the Alaska Fisheries Science Center maintains a North Pacific groundfish diet data time series that dates back to the early 1980s for many species. Diet data are from samples collected during NMFS assessment surveys and include diet composition by predator species, year, and region. Once a species is selected a list of available diet data by region and year is available, with each year linking to the diet table for that species, region, and year combination. The general diet of each species for each year and region was calculated to show mean percent frequency of occurrence, mean percent of total weight, and mean percent number of each prey item in the diet. These values were calculated as the average of the diet composition at each haul where the predator was collected. For the diet calculations, prey items were grouped into 92 common categories (shown here). For further information contact Kerim Aydin