So you could keep the fish, and not make a fire, or make a fire, but not keep any fish. Hmmmm. P quickly developed a plan to camp at exactly 9,000 feet. He would fish upstream and keep a couple of trout, then go downstream enough to where it was legal to make a fire to cook them...just kidding.
Ranger Cindy explained her interpretation of those rules, and we ended up keeping two nice fish, and cooking them over our backpacking stove in a little pan, in oil and butter, and fileting them over couscous. Delicious.
As Cindy noted: "I am concerned about good wilderness practices. Don't keep any fish you won't eat. And don't make a fire unless it's in an existing fire ring (we didn't see any...BTW). Leave no trace, but eat a few fish if you catch a couple of nice ones."