Salish Sea Marine Survival Project

Salish Sea Marine Survival Project
Name	Salish Sea Marine Survival Project
Location	Salish Sea
Established	2011
Funding	Pacific Salmon Treaty; agencies

Salish Sea Marine Survival Project is a coordinated, interdisciplinary research initiative focused on causes of declining Chinook salmon and other salmonid survival in the Salish Sea and adjacent waters. The project brought together scientists from multiple institutions to synthesize oceanographic, biological, and ecological data to inform recovery efforts for listed populations under the Endangered Species Act and for transboundary commitments under the Pacific Salmon Treaty. It emphasized rapid, policy-relevant science to support management by regional agencies and Indigenous nations.

Overview

The project convened researchers from universities, government laboratories, and tribal science programs including University of Washington, University of British Columbia, NOAA Fisheries, and the Washington Department of Fish and Wildlife. It integrated disciplines represented at facilities such as the Friday Harbor Laboratories and the Pacific Biological Station to address survival bottlenecks experienced by Chinook salmon, coho salmon, steelhead, and forage species across the Georgia Strait, Puget Sound, and Strait of Juan de Fuca. Outputs included peer-reviewed articles, technical reports, and syntheses used by resource managers at entities like the Pacific Salmon Commission and Indigenous governments such as the Lummi Nation and the Makah Tribe.

History and Funding

Initiated in the early 2010s, the project received core funding through cooperative arrangements linked to the Pacific Salmon Treaty implementation and competitive grants from agencies including NOAA and the Natural Sciences and Engineering Research Council of Canada. Additional support came from provincial and state institutes such as the British Columbia Ministry of Forests, Lands, Natural Resource Operations and Rural Development and the Washington State Legislature via state agencies. The effort built on legacy programs including the Pacific Ocean Shelf Tracking (POST) Project and leveraged infrastructure from the Salish Sea Hydrography Program. Funding partners and stakeholder organizations steered priorities through advisory committees composed of representatives from universities, federal labs, provincial ministries, and Indigenous stewardship offices.

Objectives and Research Focus

Primary objectives were to identify proximate and ultimate drivers of marine-phase mortality for juvenile and adult salmonids, quantify spatial and temporal patterns of survival, and evaluate hypotheses linking survival to factors such as freshwater habitat condition, predation, oceanographic variability, and food-web dynamics. The project focused on connections among river systems like the Fraser River, estuaries such as the Skagit River Delta, and marine regions including the Juan de Fuca Strait. It also aimed to inform implementation of recovery planning under the Endangered Species Act for listed stocks and to guide adaptive actions by organizations such as the Pacific Salmon Commission and tribal co-managers.

Methods and Field Programs

Researchers combined acoustic telemetry using arrays coordinated with the POST network, tag-recapture studies employing coded-wire tags and passive integrated transponder tags common in programs at the Pacific Biological Station, and ecosystem monitoring including plankton surveys from vessels operated by the Hakai Institute and university fleets. Oceanographic measurements used moorings and gliders comparable to deployments at the Canadian Department of Fisheries and Oceans and NOAA Pacific Marine Environmental Laboratory, measuring temperature, salinity, and currents in the Strait of Juan de Fuca and Georgia Strait. Predator-prey interactions were studied via diet analysis at laboratories similar to Friday Harbor Laboratories and through collaboration with marine mammal programs at the Northwest Fisheries Science Center. Stable isotope and fatty-acid analyses were applied in the manner of studies at the Smithsonian Environmental Research Center to trace trophic pathways.

Key Findings and Publications

Synthesis papers produced by the project provided evidence that variability in early marine survival of juvenile Chinook salmon is influenced by a combination of oceanographic conditions (e.g., temperature anomalies), prey availability linked to plankton dynamics, and predation pressure from increasing populations of piscivorous species and marine mammals. Peer-reviewed outputs appeared in journals where work from collaborators at University of Washington, University of British Columbia, and NOAA commonly publish, and technical syntheses were provided to bodies like the Pacific Salmon Commission. Findings emphasized that freshwater restoration alone may be insufficient without addressing marine habitat and food-web changes documented in studies aligned with research at the Hakai Institute and Friday Harbor Laboratories.

Conservation and Management Implications

Results influenced management discussions regarding harvest strategies under the Pacific Salmon Treaty, habitat restoration priorities in deltas such as the Skagit River Delta, and predator management policies debated by agencies including the Washington Department of Fish and Wildlife and tribal co-managers like the Makah Tribe. The project’s evidence informed risk assessments for listed stocks under the Endangered Species Act and contributed to recommendations for monitoring networks akin to those advocated by the Northwest Fisheries Science Center. It underscored the need for cross-jurisdictional, ecosystem-based approaches linking river basins such as the Fraser River with marine policy in the Salish Sea.

Collaborations and Partnerships

The initiative fostered transboundary collaboration among Canadian and American institutions, uniting partners including the University of Washington, University of British Columbia, NOAA Fisheries Northwest Fisheries Science Center, the Department of Fisheries and Oceans (Canada), and Indigenous nations with established stewardship programs like the Lummi Nation, Swinomish Indian Tribal Community, and Makah Tribe. Nonprofit and research organizations such as the Hakai Institute, academic centers like Friday Harbor Laboratories, and intergovernmental forums including the Pacific Salmon Commission provided platforms for data sharing, coordinated field logistics, and policy translation. These partnerships enabled integrated monitoring and synthesis essential to regional conservation efforts.

Category:Salish Sea Category:Salmon conservation projects