Upper Columbia River spring chinook
and steelhead stocks peaked in the
1960s and early 1980s and have
been in decline ever since. The chance
that decline will end in extinction
is being estimated by National
Marine Fisheries Service biologists
in a report that inserts a new layer
of data into the agency’s Qualitative
Analytical Report.
But it seems the risk of extinction
has a lot to do with the historical
data used to predict the future.
Using brood years 1980 to …

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