Mating of anadromous Atlantic salmon, Salmo salar L., with mature male parr

Sexually mature male parr successfully mated with female anadromous Atlantic salmon, Salmo salar, in the absence of anadromous males. There was no significant difference between the proportion of eggs fertilized by mature male parr and anadromous males. One of the demographic consequences of our observations is that overfishing could eventually eliminate anadromy in male members of a population.