Back when I was in Grad School, which was at the end of the Owens Era and beginning of the Dawgfather, the UW Coop Unit was looking at in-lake predation of Issaquah Creek Chinook (in Sammamish). The findings? Use lures that look like Chinook in the spring of you want to catch lots of Smallies.

A while later, there was a lot of angst about spin rays eating the LW sockeye fry as the exited the Cedar, as there seemed to be a big in-lake loos of fry. It was easy to blame the predators, because they do eat sockeye. Just not then, because the water temps were below levels when they feed (much). We do know that the Tigers will eat salmonids; just not when the temps are too low.

As an aside on the Tigers, WDW made a regulation banning undesirable animals from the state. One of the criteria was that an animal would be banned if it preyed on native species. At the same time, they were aggressively touting Tigers. Anybody catch the dichotomy there?