The Puyallup Tribe of Indians produces two major reports on salmon populations every year. One covers how many juvenile fish leave the system every year (or salmon production), the other covers how many migrate back from the ocean to spawn.
Here is the “Puyallup River Juvenile Salmonid Production Assessment Project 2009” report:
Puyallup River Juvenile Salmonid Production Assessment Project 2009
The data collected for the reports helps the tribe, and the state salmon co-managers, make decisions regarding salmon management.