I’ve never had any interest in fly fishing for carp, but when you float down a slow, lazy river in the baking heat on a stand up paddle board for a few days, the idea starts to seem like a good one. They swim in the murkiest, calmest, warmest pockets of water on the John Day, cruising below my SUP with the confidence of small sharks. We were fishing for small-mouthed bass. I was fishing poppers, the most adorable fishing …