Independent Evaluation of Wild Coho Marine Survival Rates in the Strait of Georgia (Black Creek)

Black Creek (fence) is the Department of Fisheries and Oceans (DFO) only wild coho indicator system for the Strait of Georgia. Since 1984 an uninterrupted data set has been compiled under the present program and is considered one of the longest time series of coho smolt and adult returns in the Pacific Region. Marine survivals are currently being evaluated using coded wire tags (CWT) on wild, non-adipose marked coho (~20% of smolts). Based on the lower than expected ratio of CWT fish returning with the current program, DFO would like to use PIT tags as an alternate method to evaluate marine survival, and investigate if there would be a difference in survivals based on CWT or PIT tag methodologies.