Pretty easy to tame. Trap it in a circular form of stone Dino gates, place catapult low if catapult is high the crab will die. Then shoot it with a catapult. Cannons insta kill the crab, do not use cannons up/vo/te so people can see
Alright not exactly my tip, but heard this from the YouTuber pterafier. He said that using a Crab with a Turtle with C4 strapped on it is a good seige device. Put C4 on Turtle, then use Crab to throw the Turtle at a base. Detonate the C4, blowing up the base where the Turtle is at. I'd recommend watching Pterafier, he has a lot of tips on his channel.
I understand that all the previous tips submitted were useful, but just in case it was not clear, hit the TOP OF THE CRAB, it will have a special animation if you hit it in the correct spot, and will take only a small amount of boulders to tame, even a high level. (Irrelevant with Cannons)
I’d say I’m having pretty bad day. So, I just bought Abberation and I was so excited, so I went over to the water. I don’t know much about Abberation, so I thought the Karkinos was just a kind little crab. Oh boy was I wrong.. I went closer to the water, as I was thirsty. But the Karkinos comes running up to me, picks me up and shreds me to pieces. Let’s just say I took a little break from Abberation 1 minute after I bought it.
Karkinos is also great at defense, is someone is trying to soak your turrets with stegos or turtles you can toss them away and win a lot of time while the atackers have to go take their tames back. Especially if near a ledge or cliff
Use the net gun to trap one, place down a catapult turret, have boulders in you inventory, start shooting at it. If it runs towards you net it again because they can pull you off your catapult. Once it’s knocked out feed it spoiled meat
If you're carrying a tamed Doedicurus in your claw the Doedic will automatically start harvesting any stones you hover him over. Just start pumping points into your Doedic's weight because it will stop at about half of its own carry weight. I've yet to discover another tame it will work with though...