At one time we had good numbers of native fish that returned as early as November and December. I don't think there was any effort to select early returning fish in order to separate them from later returning wild fish. The hatcheries simply took the earliest fish that returned to the hatchery as their egg and milt donors in order to fill their quota and get the job out of the way. It resulted in a sort of unintentional selection for early returning fish. Then of course, the harvest, both by sportsmen and tribal netters, of the early returning wild component of the runs along with the hatchery fish (which will continue until we eliminate the bonking of natives) further accentuated the imbalance. We've always been pretty arrogant about messing with natural balances that we are only now beginning understand.
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PS