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.
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
Most think u can not take larger Dino's till higher levels but this is wrong if u lead a spino towards a beach it has high agro range so it will attack anything while u make ur way to a cliff then us a bow with tranq arrows to nock it out and prime meat it
Best mount for killing alpha mosa and obtaining ascendant fishing poles take three to 4 buddies on spinos and scuba tanks and goto town enjoy the fishing I have 15 ascendant poles sitting in my locker right now
Honestly, these things seem content to attack anything and everything. I just tamed one without it landing a single hit on me, and I was standing STILL. (...on the back of my Rex so I had a height advantage to my tranq dart range. And protection just in case.) All I did was stand there firing my darts. She came towards me, but then got distracted to kill a Dilo. By the time she'd snaked her way round to me, she was so high on torpor that she turned and started to flee, not before I stuck a couple more in her and finished the job, though.
The best thing to find one is flying over the river randomly. if you found one make sure he cant hit you (go on a boulder or on a cliff) and shoot at him with tranq arrows. If he is unconsious just put prime or normal meat in him and make sure you have enough narcotic (i tamed a level 50 first and it needed about 200) and if you are escorting him into your base do NOT attack any strong dinos he cant handle it if its a level 100 or less spino that does not mean its weak but you have to level him a bit before killing strong dinos (the spino level 50 got 22 level with the taming bonus and he died at escorting him to my base from a therizino btw that was 30 mins ago now im mad at this game, it was my first spino)
I recommend using a longneck rifle with tranqdarts. Headshots do more physical damage and less torpor. Aim for the sail and the neck. Use argent kibble. Second prime fish, third mutton. When tamed, use a quetzal with a platform saddle to transport it to base.