Generally, salmon have a certain amount of variance in the location they migrate to. A certain percentage of the population varies from the birth location and tries new places. This is probably an adaptation that provides the larger population with greater resilience!
Generally, salmon have a certain amount of variance in the location they migrate to. A certain percentage of the population varies from the birth location and tries new places. This is probably an adaptation that provides the larger population with greater resilience!
This, and they may have released smolts there after removing the dam.