You can breed them in the squid trench on rag and incubate the eggs there also 👍 so ppl see this. No information about this on here.

Go into the ocean in fjordor around the swamp island In the west of the map. You should see some turtles so to tame them find a school of fish and let them follow you to the large turtle. Swim beside it and try and get the fish to target the turtle. This will start the taming process keep doing this till tamed. For the saddle kill the turtles to get shell fragments and combine 22 of them with standard materials in a smithy. You can build on their saddle but don't cryopod if you have built. Make sure others see this

Ps: they are originally from genesis 1 in the ocean biome.

Passive Tame: You kite a parrot fish swarm to the turtle then guard the turtle from sharks and things.

While the turtle "feeds" on the swarm! Any damage resets timer to 0!

Getting inside it with Honey is BS and will NOT work.

Lead it into a line of stone behemoth gates and close a gate behind it and it will be trapped or you make a square box of Dino gates and nothing can mess its taming up while it’s being tamed so up this!!!!!!!

If breeding on Lost Isles head to 42.5 lat 17.8 lon. you can breed in the bottom of that mini trench thing. Area is too hot to hatch in but you can just build a mini hut with an incubator and gen at the bottom. Set incubator to -5 that's my sweet spot.afterwards cryo it up ride to surface and imprint.

They have patched the render range range so ignore any tips that say to leave render as it will no longer. Guess I’m stuck with the turtles I have, I’ve spent three hours trying to take one of these things and had it walk out of the water which reset it taming! It was at 80% that time. Never got it above 20 after that. What he for the saber tooth salmon that spawn to kill the swarm if they bite the turtle it resets to zero and you start over. Extremely frustrating way to tame a creature. I would like to beat whoever came up with this idea.

You need to lure a parakeet fish school (if the school won’t aggro that means there is a feces near by and you need to pick it up) to one of these and you need to be off your mount for the taming to start. Do not leave the megachelon side or else the fishes will despawn (and the taming bar wil slowly go down) and don’t let anything attack it or the taming will start over.

Make sure to stick close while it's taming. They patched it so you can no longer tame it out of render distance

Alright to actually tame this giant turtle you need to lead a microbe swarm to the turtle, then protect it from sharks and eels while it passively swims around and eats the swarm

Preparation is key to not spending 10+ plus hours like I did the first time trying to tame. First setup behemoth gates each with doors in the shallow water as a trap. I'd say 5 to be safe but can be done with just 2. Allow space between behemoth gates big enough for a mosa to fit tightly between. Make sure you have a speargun or crossbow to kill coels and sabersalmon since they spawn and eat the fish swarm. Go ahead and trap your megachalon. You dont need a roof on your trap since the creature gets stuck in the doors. Here's where things change depending on solo tame or duo taming. You must be within a few blocks for it to maintain in taming. So if you have a partner, choose who will stay with the megachalon and who will be pulling swarms to the tame. Put poop in your last slot to maintain aggro of swarm. You most likely will need multiple swarms. If doing solo, get at least 4 swarms just out of agro of megachalon before starting and then kite each as needed to the tame.