The Howland dam proposal has proved to be the most controversial of the three due to concerns that invasive northern pike also will use the new fish bypass, threatening the prized brook trout and landlocked salmon fisheries upstream of the dam.
Pike are a non-native species similar to the pickerel but much larger and with a voracious appetite.
However, they will eat everything that moves - any fish, ducklings, mice, snakes, etc.
Those trout and salmon you mention don't have a chance.
Pike are “non-native”? Does Canada count?