![Sulphur Biot Dun](http://bigyflyco.com/cdn/shop/products/Sulphur_Biot_Dun_600x400.jpg?v=1685019823)
Sulphur Biot Dun
- Ephemerella invaria, throughout the midwest and many other regions as well, this is THE hatch to fish.
- Many dry fly fishermen fish biot exclusively biot bodied dry flies.
- Biots make very slender realistic bodies.
- Sulphur hatches usually last two-three weeks in beginning in May.