In addition, results indicate that output would be changed only minutely by the incorporation of additional modifiers into the model. Finally, the impact of fitness is essentially the same whether the gene complex modeled acts alone or as part of a polygenic system. Hence, the results obtained can be considered quantitatively as well as qualitatively applicable. Numeric output will be provided elsewhere in a more rigorous and detailed presentation. There is a slight depression in fitness, but this is likely to be compensated, or even overcompensated, by the reintroduction of lost alleles.
Genetic distance tends to cluster around two values, near zero and near one.
Mixing may even be advantageous. Initiating such stocks would be decidedly unwise. Hybrid vigor is invariably reversed in the F2 generation and beyond, even for very similar genetic stocks. Practically, however, given the long life-histories of most anadromous salmonids, recovery is not a practical expectation. Wild populations are invaded, or hatcheries are periodically refreshed with other stock.