Spent Baetis Rhodani – also known as the Large Dark Olive in its final stage is a fly I always carry in my box.
The beauty of this fly is that it doesn’t need to look perfect.
It should look dead.
The wings should lie flat.
The body should be slim and slender.
No movement, no twitching — just a still silhouette against the surface.
For those new to fly tying, mayflies live two lives.
First as nymphs underwater, sometimes for several years, and then as adult flies above the surface — for only a few hours or days.
During that short time, they mate, the female lays her eggs on the water, and then she falls, exhausted, with her wings outstretched in a final embrace of the surface.
That stage is called a spinner — and when she lies there with her wings spread and body motionless, she is called spent. A spent spinner. Finished. Done.
It is in that exact moment the fish know it’s time.
A free meal.
No energy, no resistance — just something drifting quietly in the surface film.
When do I fish it?
Baetis Rhodani is one of the first mayflies we see each season, typically around April/May — even earlier in southern parts of Sweden. Hatches can continue well into autumn, which makes this fly a permanent resident in my box.
Fish it in the late afternoon and into the evening when the spinner fall takes place.
Want to tie it yourself?
Below you’ll find all the materials for the Spent Baetis Rhodani — along with a clear tying video from Fliesbyaspeen, including a clever trick for tying in the tail fibers.
Psst: Ask The Fly Expert "Spent Mayfly" for the complete material list which stays saved while you navigate the site.
Materials:
- Hook: Fulling Mill Ultimate Dry Fly #14
- Thread: Nano Silk 30D
- Tail: Speckled Moose Body, Brown / Moose Mane
- Body: Snowshoe Rabbit Foot Dubbing, Brown
- Wing: Polypropolene Floating Yarn, Cream
- Ribbing: UV Micro Ribbing Quill, Brown
