1970s to the 1990s, suspected in large part to be the result of

worsening ocean conditions that hurt survival.
Survival estimates have shrunk from relatively banner years in the 1970s
and 1980s to Columbia Basin adult returns that amount to less than
per hundred smolts in the early 1990s (.9 percent for coho compared
2.72 percent in the 1980s, .22 percent for spring/summer chinook
compared to .69 percent, .30 for fall chinook compared to .49 percent
and .42 for steelhead compared to 1.38 percent).
Radtke notes that that there has been no …

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