date:May 16, 2012
at have suffered serious declines due to dams and habitat degradation.
These studies suggest that even more caution is needed to make sure hatchery programmes keep wild salmon safe, and don't inadvertently hurt the long term potential of salmon runs, says Mr Rand.
Since the mid-1970s, large increases in hatchery programmes in the US, Canada, Russia and Japan have released billions of fish into the water. And the increasing global demand for salmon has resulted in calls to further expand ha