Or this one:
In 1996 the Oregon Department of Fish and Wildlife initiated a “rescue/recovery” hatchery program for wild coho in the Clackamas River in an effort to increase the number of wild coho. “This rescue program was initiated in response to the extremely depressed returns observed during the late 1990s” (Mark Chilcote, ODFW).

In his analysis of this native broodstock rescue program Chilcote made the following key points:

”The smolt to adult survival of “wild-type” hatchery fish was nearly 1/10 of the survival rate for wild smolts (97 and 98 brood year production).”



“Averaging the results of 5 brood years, the total return to the basin was not increased by using wild fish for hatchery broodstock. Just as many total fish would have been produced if there had been no hatchery program at all.”



“All the hard effort involved in collecting and raising these fish didn’t pay off. These results have very serious implications for the use of hatchery programs to help restore lower Columbia River coho.”



“We need to find out why this occurred (if we can). If there is no corrective solution, then our tools to help restore lower Columbia River (LCR) coho have been significantly reduced. We need to respond accordingly.”

“Removing wild fish and running them through the hatchery system yielded no more adult offspring than if they had been left in the river.”

“When spawner density begins to fall into the range that we might be concerned about the persistence of the population, we should expect egg to smolt survival to be at its highest. Under such conditions, there will be little benefit to bringing some of the wild fish into the hatchery environment if the resulting hatchery smolts will have ocean survival rates that are 1/10 of those for wild smolts.”

“…all indications are that hatchery fish, even from wild broodstocks, are not as successful as wild fish in producing viable offspring under natural conditions…”

“The survival rates for the hatchery “rescue” smolts were low; 0.7% for 1999 smolts and 2.2% for 2000 smolts. In contrast, survival rates for wild smolts in the same years were 6.6% and 15.3%. Although, hatchery smolts normally do not survive quite as well as do wild smolts, the difference is generally much less.”

Source: Mark Chilcote memo to Bob Hooton and others, February 1, 2002. ODFW