Spawning Survey Details

Spawning Surveys: Since 2012, spawning surveys have been conducted in four Lower Columbia River Chum Salmon populations. Surveys prior to 2017 were not randomly selected and concentrated in areas with the highest likelihood of encountering Chum Salmon. Since 2017, surveys have been conducted randomly within a Chum Salmon sampling frame based on historical habitat and gradient. This new approach allows population estimates to be generated within the four populations. Click to see locations.

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