Spinner Callibaetis by Big Y Fly Co.
Spinners are the adult stage of mayfly life, involved in reproduction. Our selection focuses on spent-wing spinners, when mayflies ‘drop like flies’ during the final phase of their life cycle.
Many fish actively feed during the spinner fall, as these insects are easy to catch and abundant in the water. Callibaetis spinners are among the most important spinner falls for lake anglers and are also commonly found in rivers.
Callibaetis hatches are widespread across many rivers and can be the dominant hatch in lakes, making them a key pattern for anglers targeting trout and other predatory fish.
| Feature | Detail |
|---|---|
| Species | Callibaetis |
| Life Stage | Adult spinner (spent-wing) |
| Target Environment | Lakes and rivers |
| Feeding Behavior | Highly active during fall |
FAQ
What makes Callibaetis spinners different from other mayfly spinners?
Callibaetis spinners are known for their prevalence during the ‘spinner fall’ and are especially important in both lakes and rivers. Their abundance and easy accessibility make them a prime target for fish during this stage.
When are Callibaetis spinners most active?
Callibaetis spinners are most active during the late afternoon and early evening, when mayflies drop from the water in large numbers, especially during their spent-wing phase.
Are these spinners suitable for trout fishing?
Yes, Callibaetis spinners are highly effective for trout fishing, particularly in lakes and rivers where they are a dominant hatch.

Ruth Hughes –
This spinner matches the real Callibaetis fall perfectly. I’ve used it during lake hatches and caught several trout on it. The weight and action are natural, and it floats well in still water.
Tracey Young –
Great imitation of the spent-wing spinner. Works well in rivers during the late afternoon. A bit more delicate than I expected, but still effective when fished slowly.
Ruth Hamilton –
Used this during a major lake hatch and had a solid catch. The color and size match the actual insects well. Highly recommended for anglers targeting trout in still waters.