The Sempermouse fly is the result of countless hours of research and development. After over a year of collaboration, Steve (a fellow AvidMax Fly Guru) and I are excited to finally share this creation. A big thanks to Semperfli for providing us with the innovative material that made it possible! Semperfli Wabbit is a truly unique material, offering excellent movement, quick water-shedding properties, and long-lasting durability, even after many catches. It’s also incredibly easy to work with for tyers. To achieve the right action and floatability, we found that 6mm foam is essential—anything less results in a mouse pattern that dives underwater rather than swimming frantically on the surface, though that can work in the right conditions. We prefer a few different color combinations, but Fox Squirrel is our go-to choice. If you’ve never tried fishing with a mouse pattern for trout, you’re missing out on some of the most thrilling “dry fly” action you’ll ever experience!
Ingredients, Tools & Recipe
- Hook – 2557 Daiichi (Size: 10)
- Thread – GSP (100D Black)
- Body – Semperfli Synthetic Rabbit Zonker ‘Wabbit’
- Front Hook/Shank – Firehole 811 Size 2
- Head – 6mm Foam
- Tail – Semperfli Chennile
- Adhesive – Zap-A-Gap

Excellent fly – Well Done! Like the facts that it is well crafted and yet a relatively simple tie, that it is a solid and robust looking workhorse fishing fly that uses the materials characteristics to the max. Having used and worked with the Semperfli Wabbit I understand how the features of it work to make your fly and calling it the Semper Mouse is inspired as the video shows the material working in the water very well. This will go global!
I’m curious to know why you oriented the trailing hook with the point upward. Won’t that tend to flip the fly over when it lands on the water?
It’s impressive how much trouble you’ve taken in selecting the materials and tying the fly in order to get the desired action on the water. Very impressive. I do think you’re giving Semperfli a little too much credit though – I think you should call it the Max Mouse.
Always enjoy new ideas for creating a fly the fish may not have seen before.