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Protocol for Snorkel Surveys of Fish Densities: A component of Monitoring Recovery Trends in Key Spring Chinook Habitat Variables and Validation of Population Viability Indicators

Jan 6, 2020


This report describes a protocol for monitoring fish densities and fish assemblage structure using snorkel surveys. The Columbia River Inter-Tribal Fish Commission, Oregon Department of Fish & Wildlife, and Confederated Tribes of the Umatilla Indian Reservation have recognized the need to use a common snorkel survey so that information collected by individual entities can help managers determine whether aggregate habitat restoration actions will yield a net improvement in basin-wide habitat quality for ESA-listed fish species. To this end, we developed a snorkeling protocol drawing heavily from the protocols of Thurow and O’Neal, intended for use among all agencies responsible for data collection in the upper Grande Ronde, Catherine Creek, Minam River, and potentially other nearby basins.



White, S.M., C. Justice, and D. McCullough. 2012. Protocol for snorkel surveys of fish densities: A component of monitoring recovery trends in key spring Chinook habitat variables and validation of population viability indicators. Columbia River Inter-Tribal Fish Commission, Portland, OR. 16p.



Report No.


Media Type

CRITFC Technical Report