Like Duck just said, jacks do spawn with the rest of the salmon. From what I've learned they don't usually have a female to themselves; they just dart in and fertilize the eggs before the normal sized male runs them off. I'm not sure what the rules are on the Cowlitz, but in my opinion, there shouldn't be a jack only fishery. Think what would happen down the road if there was a jack only fishery. The jacks presence in the gene pool wouldn't be there and pretty soon you have genetically altered this run of fish; especially if each fisherman could retain 6.

With hatchery stocks there are more mini-jacks than in native stocks. This is because young hatchery fish are raised to a smolt as soon as possible. Since they have such a good growth rate, this is an environmental cue for the fish to return and spawn. The fish barely make it to the saltwater before they turn around and come back.

I'm kinda rambling on, but I don't think they should open it up for a jack only fishery. It is a part of the salmon run and it shouldn't be pounded. WDFW should also use a portion of the jacks when fertilizing eggs.

~ Dr Pepper