Harvest was depriving nursery lakes of nutrients from salmon carcasses.

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Presentation transcript:

Harvest was depriving nursery lakes of nutrients from salmon carcasses

Total sockeye returns for Barkley Sound – B.C. Salmonid Enhancement Program/Lake Enrichment Program Kim Hyatt, Pacific Biological Station

Pacific Northwest streams and rivers showing increased productivity in response to nutrient additions Berry Creek, Oregon Kalama Springs, Washington Carnation Creek, B.C. Keogh River, B.C. Nechako River, B.C.

Gresh et al * Prior to 2000 change in ocean conditions Estimated nutrient value of salmon returning to the Columbia River Basin

Bilby et al Juvenile salmonid density

Oct.Nov.Dec. Carcasses No Carcasses Average Weight (g) Coho salmon growth Bilby et al. 1998

Lower Columbia River Fish Enhancement Group Carcass Analogs

Effectiveness monitoring of carcass placement Claeson et al Jul Aug Sep Jul Oct Wilzbach et al. (2005): “In our experiment, the addition of salmon carcasses did not detectably affect total or age-specific salmonid biomass, density, or growth.”

Potential environmental concerns Water quality Pathogen spread Toxin inputs

“There are many unresolved issues surrounding nutrient enhancement in salmon restoration, particularly in the Oregon Coast Range. Decisions about salmon restoration must balance the benefits for aquatic and terrestrial organisms with the potentially harmful effects of increased nutrient and toxin loads.” From Compton et al. (2006) Ecological and water quality consequences of nutrient addition for salmon restoration in the Pacific Northwest. Frontiers in Ecology and Environment 4(1).