Oceanographic and habitat conditions significantly affect, and can even govern, the productivity of Northwest salmonids and groundfish. This research program focuses on the effects of ocean variability, habitat and human activities (including, in the case of groundfish, fishing patterns and regulations) on distributions, health and marine survival of salmonids and groundfish. Fishers have known for generations that specific habitat features favor high abundances of unique marine resources and that fish stocks respond clearly and sometimes suddenly to shifts or fluctuations in climate or fishing patterns.