What feeding strategy and adaptation would an organism that lived in the abyssopelagic zone most likely use in order to survive and why?

This is a zone with absolutely no sun lights. One adaptation can be the light that is emitted from fish like the horned lantern fish. It emits light because the light attracts other fish, and then it can eat them. If it didn't have it, it couldn't hunt.

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Abay where the river empties into the sea