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Coho - Umpqua Stratum
The Umpqua biogeographic stratum includes the historic distribution of coho in all watersheds that drain into the Umpqua estuary. There are a total of 4 independent populations and no dependent populations in the stratum.
The trend in adult abundance is presented for all strata. Analyses for other criteria are available for the individual populations contained within each stratum.
Progress
At the Stratum level, the only measurable criterion available is spawner abundance.
Description
Annual estimates of the abundance of naturally-produced spawners for each stratum
Trend
Map
View the strata and the population boundaries. Select a population on the map or from the list on the right.