View uncertainty details

UncertaintyHow can the abundance and diversity of salmonid populations in the Columbia River be increased and sustained over the long term given the multitude of biological, physical, and cultural constraints? In particular, what are the potential benefits and risks of re-introducing anadromous fish into blocked areas throughout the Pacific Northwest?
ThemePopulation structure and diversity
SubthemeStatus and trends - targets
Sources SRG 93-3: Critical Uncertainties in the Program
Criticality Level Priority
Rationale This uncertainty is central to the vision and goals of the Program and focuses on practical strategies that are consistent with a landscape approach needed for improving current Program activities. Current knowledge is low, potential benefits are large, and research seems feasible. Much remains to be learned about how hatcheries and environmental changes will affect the long-term sustainability of natural salmon populations. A number of projects within the Basin are examining the effects of supplementation on natural population abundance and productivity. Climate change is expected to alter the distributions of salmonids, especially bull trout and cutthroat trout, and continued monitoring and evaluation will be required. Efforts to re-introduce anadromous salmonids to blocked areas with favorable water flows and temperatures (e.g., to higher elevations or more northerly locations) may prove beneficial to the long-term viability of salmon populations in the Basin. However, specific uncertainties about the effectiveness and unintended consequences of re-introduction remain to be addressed.

last updated: Jan 27, 2016