Adult Return — Peak/Other Spawning Counts

This data category contains counts of fish on their spawning grounds. Included are both counts of live fish and dead fish, presented as either raw counts or as number of fish per mile. The term “peak count” is used in at least two different ways in the Pacific Northwest: 1) a single count conducted at the time when the peak number of fish are expected to be on the spawning grounds; 2) the highest count from several conducted through the course of the spawning season. Which definition of “peak” count is meant varies geographically and perhaps temporarily. Refer to the documentation to determine which measure is meant for each particular time series. These counts are generally conducted annually.