Not too long ago I read a piece which suggested that large amounts of forage fish might take some predatory (think pinnipeds) pressure off out migrating salmonids.

(But watch out when that biomass of forage fish drops precipitously and 19,000 or more very hungry seals go looking for a meal)
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Remember to immediately record your catch or you may become the catch!

It's the person who has done nothing who is sure nothing can be done. (Ewing)