Thus aroused, the females flutter into the bobbing frenzy of males. From your float tube it is easy to discern the males acting like crazed yo-yo's while the females execute crisp horizontal patterns through the melee. Just about the time the morning hatch is winding to a close, the spinners arrive to lay their eggs. These are the mayflies one most commonly finds crawling all over his body and car during lunch. The female Callibaetis whisk along the surface of the water and dap their abdomens into the film to release showers of fertile eggs.
Callibaetis spinners can cause tremendous frustration.
The trout are still rising, but the pattern that was so successful twenty minutes earlier is ignored. Anticipate the spinner fall. As soon as spinners start landing on your arm or the trout begin to refuse your fly, tie on a spinner imitation, but not just any spinner. The wings of the spinner had to fit inside the exoskeleton of the dun. To fit, they were folded up nice and neat like Geisha fans.