Pacific herring (Clupea pallasii) occur throughout the North Pacific ocean and are vitally important in both pelagic and coastal food webs. Herring are important prey for larger fish, seabirds, and marine mammals. They lay their eggs on coastal seagrasses and algae, and those eggs feed predator species that forage along the shore (e.g., invertebrates, birds, and mammals such as raccoons and black bears). Herring were integral to ancient human cultures, and are still important to native and other modern fisheries. With cooperation from California Audubon scientists, we are studying trends and variability in herring populations along the west coast of the U.S. and Canada. We are finding that herring abundance in these areas has been declining for the past few decades, which may negatively impact numerous other species, as well as fisheries yield. Our study aims to describe the temporal variability of this decline as well as how it is varies between different areas along the west coast.