...plus do not forget, there is a certain amount of straying that occurs.

Take for example the Hoh River...does not get an official summer-run hatchery plant, but ever summer a good number of hatchery summer-runs are caught.

This straying does occur more often within hatchery populations but it does occur within wild populations as well.

To surely identify the origin of this fish, tissue from a fin would have to be collected and sent in for DNA analysis and compared with DNA of hatchery fish planted in the system.