If you are having a hard time finding spino's in their respective spawn zones (especially Ragnarok), kill all the fish in that area. They share the same spawn capacity and can be out spawned by coles! ( up vote so Rag players know!!!)
To be strictly honest the spinosaur is one of the best mounts in game if you are even wble to obtain one be sure to make it a high level one they are very squishy at first so go around killing small dinos before attacking big prey
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
TLC patch coming in March 2018 to add the ability to swap between 2 legged mode (faster attacks and ability to attack with claws) and 4 legged mode (Faster movement), as well as increased turning radius, movement speed, damage, and health regen while in water and for a short time after leaving it. Like so people can see!
When in water, the spino can move without using stamina, this means that in a fight, if you run into a deep water source, you don't need to worry about stamina if you need to retreat. Has an oxygen bar so you can't dive forever sadly, very fast in water though.
How I got mine:
Get a pteranodon
Check for other creatures nearby
Land on a really tall, unclimbable rock
Go ham with any tranquilising weapon
Feed much narcotic
Kill stuff for meat and prime
There you go sir, 1 spino free of charge
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.