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The lake trout plays a vital role in the Lake Superior ecosystem. The lake trout is considered an apex predator, which means that it has no predators.
Nope ... no predators at all.

The Micropredator's Poem

Great fleas have little fleas upon their backs to bite 'em,
And little fleas have lesser fleas, and so ad infinitum.
And the great fleas themselves, in turn, have greater fleas to go on;
While these again have greater still, and greater still, and so on.

See Siphonaptera (poem).