Regardless of whether predation is observed , natural social interactions are disturbed by the release of large numbers of hatchery - reared salmon where wild populations are low .
Salmon in hatcheries naturally have a higher propensity towards aggressive behavior .
Regardless of whether predation is observed , natural social interactions are disturbed by the release of large numbers of hatchery - reared salmon where wild populations are low because salmon in hatcheries naturally have a higher propensity towards aggressive behavior .