Lure and subdue an Abyssal Seahorse.
If you are going to be making it anywhere in this kelp forest, we need to get you a reliable mount. I think I've come up with a better plan than the sea turtle, and it's not far.
Tie off a lure at the rope just west of us, and then mount the seahorse that it will attract.
Be warned, you may need to work hard to break the beast.