Using an unplanned experiment to evaluate the effects of hatcheries and environmental variation on threatened populations of wild salmon

Publication year: 2009
Source: Biological Conservation, Volume 142, Issue 11, November 2009, Pages 2449-2455</br>
Eric R., Buhle , Kirstin K., Holsman , Mark D., Scheuerell , Andrew, Albaugh</br>
Efforts to conserve depleted populations of Pacific salmon (Oncorhynchus spp.) often rely on hatchery programs to offset losses of fish from natural and anthropogenic causes, but their use has been contentious. We examined the impact of a large-scale reduction in hatchery stocking on 15 populations of wild coho salmon along the coast of Oregon (USA). Our analyses highlight four critical factors influencing the productivity of these populations: (1) negative density-dependent effects of hatchery-origin spawners were ~5 times greater than those of wild spawners; (2) the productivity of wild salmon decreased as releases of hatchery juveniles increased; (3) salmon production was...</br>

11th August 2010 12:14

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