The inch-long supa-heavy Gorilla Stonefly Nymph gets its name from an ingrained awe-inspiring encounter with a colossal Big daddy "don't mess with me" silverback in the jungle of Zaire (Congo). This whopping, battleship-sinking stonefly nymph is the heftiest you'll need and probably be able to purchase anywhere! – it acts like a creeping stonefly when fishing, rides hook-point-up for fewer snags and more trout hookups, and its knotted rubber legs and wiggly swim entice curious Trout to bite before it hits bottom.
Two hidden tungsten beads, lead and metal chain black bulging eyes make this the fly of choice for the big ones waiting at the bottom of deep pools. Tie on a Gorilla! Today, its design was finished outside NZ and field-tested in BC, Canada and Montana. It was a sure Bull Trout-hugging champ on the Wigwam near Fernie.
Go the gorilla- you need at least two of these in your box for when you will need them to get down like a Sex Machine (James Brown style).
Remember, Having more than one of any good fly in the correct size is always good. So, the more significant the pack, the better; that way, you will have a few staple flies doubled and trebled up in the pack selection.
As we know, there's nothing worse than losing the only fly you have that works.