Don’t bother with a turtle if solo, it swims up too slowly when following and will get recaught until it dies. I’ve had better luck with a dunkleo with a good saddle, they have the ability to swim up vertically unlike the turtle and disengage from the squid when following easily. Just let squid grab passive dunkleo, jump off and feed squid and then swim up with dunkleo following you. Easiest when done at the squids height limit. Makes for an easy solo tame.
You need two people, one for feeding the black pearls and the other to feed the turtle that is in the grasp of the Tusoteuthis, with sweet vegetable cake for the health and to feed it stimulates berries as well
Just tamed a 150 on an official server. Building a trap high off the ocean floor works great just trap it and rotate out 150 tamed turtles hp pumped. Took about 2 hours with pearls for the tame. Took 50 pearls every 5-10 min. Happy taming!