For the love of God, make a trap to keep it contained and keep it away from the water as much as possible so the dumb thing doesn’t drown itself when you knock it out. These dudes are an absolute nightmare to tame if you aren’t prepared enough. At the very least, bring 50 narcotics to be on the safe side because that torpor drops FAST. Also, use darts, arrows can be risky since a Spino’s health is usually pretty low to begin with. Kibble, prime meat or mutton is the best and quickest way to tame them and you won’t use as many narcotics to keep them down. They are insanely fast and frustrating and I hate taming them but they are pretty powerful and are handy water mounts to have. Good luck and don’t be like me where one of the buggers ran off into the ocean and was never found again.