To tame I took my fastest Sarco and while swimming where I can along with the Spinos aggro I just hip fired with my crossbow. To prevent the Spino from drowning it will always begin to run away before being knocked so while it is booken it time your last few shots for when the Spino is on the land when it is time to be tamed.
Hey, ok so the center, coordinates 08.1 / 63.4 spinos will spawn there, if is not high enough just kill it, leave the area and come back after 3 mins. Normally works, I found a 150 and I'm taming it rn
stand on a high cliff and shoot it or keep shootong it and running away on a raptor until it's knocked out. it gets distracted very easly by fish, sharks and manta's (even while chasing you) so you may want to shoot it while it's distracted.