Same raise time as a Rex! Difficult part is breeding these things. You have to breed them on genesis in a tek cube at 20, 50 inside the pool in the cube. After that, the egg only incubates in the water at the bottom around 32, 52. I recommend building an egg house on the back of one of your adults and using it to protect the eggs. Never run out of oxygen. Be aware of mosas, eels, sharks, swarms, and jellies. Otherwise, easy raise. Holds berries super fast!
Tamed you'll be able to build on its back. When diving he provides an oxygen bubble on his back allowing you to submerge your base on the floor of the ocean.
Are you turtley enough for the turtle club?