High and low on the watershed.
The big dark Pteronarcys salmon fly nymphs are vegetarian detritus eaters that need clear cold clean water to live in.

Golden Stoneflies are carniverous. They like cold and clean too but they can also withstand the warmer dirtier waters lower down on the river.

Jellystone Nymph


Rubberleg Stitch


Ruberleg Needle