Ciannelli, L. NOAA AFSC / University of Washington, Seattle, lorenzo@fish.washington.edu
Brodeur, R. NOAA AFSC, rbrodeur@afsc.noaa.gov

 
BIOENERGETICS OF AGE-0 WALLEYE POLLOCK IN A FRONTAL STRUCTURE OF THE BERING SEA
 
Age-0 walleye pollock, as well as their predators and prey, are found in high numbers around the Pribilof Islands of the Bering Sea. During summer, the waters adjacent to the Islands form a frontal structure, characterized by a well-mixed inshore domain, a front domain, and a two- layered thermally-stratified offshore domain. The physical nature of these waters may confer such favorable feeding conditions to age-0 pollock, that any risks of predation become negligible. Therefore, bottom-up effects may be driving the population biology of age-0 pollock. In this study we develop a spatially and temporally explicit bioenergetics model to quantify influences of the physical environment and lower trophic levels on age-0 walleye pollock population biology during three different years. This bioenergetics model is used to estimate age- 0 pollock consumption over a simulation period of two summer months, and to produce growth potential maps given temperature profiles and zooplankton biomass. Preliminary results show that fish growth potential is higher in 1994 than in 1995, due mainly to higher zooplankton biomass and a deeper thermocline. Differences also appear along the inshore-offshore line, with the inshore region showing the lowest growth potential.
 
Day: Wednesday, Feb. 3
Time: 02:00 - 02:15pm
Location: Hilton of Santa Fe
 
Code: SS20WE0200H