Predator sounds dramatic, but there really isn't much non-microscopic life in the oceans that isn't predatorial. Large herbivores are land-evolved.
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At that depth an important food source is formed by the dead bodies or parts of bodies of various big or small animals, which fall from shallower water after their death.
Because at high depths there is no primary production in most places (with the exception of vents where free dihydrogen or dihydrogen sulfide may feed bacteria), most animals must eat the dead organic matter that falls from above.
Predators that eat alive animals from that depth must be much fewer than the animals which eat dead matter, otherwise they will die of hunger.