The catfish fishing was actually quite fun. I think there was a limit to how many you are supposed to eat, but we just put them all back. It's so fun so see their little whiskers come up when there's something in the water. The kids had a blast fishing for them, but have pliers so you don't hurt yourself getting them off.
There are MANY catfish in the main channel. In the upper canyon they'll be small but those that are big enough to skin (8-10") are good eating with a little tobasco or bacon. You might occassionally get one bigger, but not more than a pound or so and usually only half that. Down in Grey Canyon there are some deeper holes and bigger fish. In the upper canyon nightcrawlers on short-shank #10 hooks with slip-egg sinkers work best, but they'll take lunchmeat, cheese, whatever. In the big deep holes I hear mice work well. Catfishing is great for the kids. We had a contest and the winner caught five (5) fish on one (1/3) of one nightcrawler before having to re-bait. If you find a school you'll be hauling them in right and left.
There are small trout in Rock Creek. My buddy caught 3 a couple weeks ago in under an hour. But they are small. Creek's not big enough to support larger fish.
Several years ago caught several very small cats on a dry fly in the main channel. The fly was an Adams maybe? I don't remember. They were small but fun. If I did it again, I would do it with a very small rod, a 2 wt or 1 wt if I had them, which I don't. Length was unimportant as well. This was in late July, FWIW.
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