In terms of marine mammals (I don’t know how this relates to bears and other land-living species including humans), the Northern Fur Seal population eats 289700 tons of fish annually, more than any other creature in the Eastern Bering Sea (which includes populations of the Gray, Minke, Humpback, Bowhead, and Killer whales, among other mammals).
I suspect this is probably the highest though, since even bears, which would be my assumption for the highest land-based consumption just based on their size, don’t really eat that much fish. But since the figure above is for a population, than surely humans have the seal beat.
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