Landlocked salmon are predators. That’s been a proven fact for over a century. So when you put a couple hundred 13″ plus salmon in a pool below a hyrdo facility, you can bet they’ll be keyed in on baitfish spilling out of the reservoir above.
Just about any pattern that imitated a fish did well here. The challenge was trying not to spook the salmon so they’d be inclined to bite. Took some patience but it paid off.