Killing these with a Megaladon is one of the best ways to farm Black Pearls. Can be found on the ocean floor. Beware, as their attacks penetrate armor and apply lots of torpor.
After you risk taking a deep ocean death nap trying to kill these narco pinchers, use a metal hatchet for black pearls. They dont give you very much, but their easier to kill and easier to find then alpha squids
If you're hit by one of these guys you're instantly gonna go unconscious. Be wary of them. They spawn at the ocean floor and also remove stamina with hits. They cant swim and walk across the bottom of the ocean.