They take almost nothing from a stream and the carcass is everything to the natural order and are one the most valuable fish to a watershed. Also Chum is one of the two Salmon species that if you do brood and max out HSRG it has zero hatchery traits carried forward do to the life cycle of the creature. ( You do not rear it )

The down side is not genetics it is the fact that the agency & tribes WILL harvest the hell out of them and impact the current natural spawning population.
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Dazed and confused.............the fog is closing in