The new regulations will up the bull trout daily retention quota to two per day, while making it catch-and-release for all rainbow trout caught below the confluence with the Lardeau River. “We’ve looked at the diet of predators, both rainbows and bull trout, over the last two-and-a-half years and we’re continuing to do that, but what it showed is that bull trout are really effective at eating kokanee – even at low densities, and rainbow’s are switching, becoming insectivores,” said FLNRO’s Kootenay biologist Matt Neufeld.