Be very careful about these-they do tons of torpor damage, I was down on the bottom of the ocean (on the island) and I saw a pack of these sea scorpions. I decided to dismount off of my mosa and kill them with my pick, as that would get more black pearls. When I got close to them one of them-a level ten hit me and knocked me out in one shot. I was level 88, wearing journeyman flak and apprentice riot. And they knocked me out in one hit. The moral of the story is that these things are very dangerous.
Killed a bunch of these with just me and my mate easily. Boat and crossbow works a treat, don’t get too close or you’ll get knocked out but shorting from range at ocean surface level or just under worked wonders. Just make sure they all dead before you harvest