Tame it.

Need I say more?

Use tranq...

Probably

Two words. FAMILY

It’s useful for killing the moder but only tame 2 and breed them the mosaurus take like 3 hours to tame

The wag I tamed mine was with my trusty sarco we went to the bottom on the ocean with a crossbow tranqs and scuba set and as you go up he doesn’t Argo so just keep following him and hitting him till KO

When you knock this kawai sea T-rex give him cca 600 narcotic and make hes eat in short tíme so many spam this and you will Bug his torpor and torpor never go Down or fór long tíme you safe ;3 and you can have break

Get a mosa and you are basically unstoppable unless you encounter a 100 above alpha mosasaurus or tuso. Taming is easy 9n a dolphin and if you have good crossbow you can tame it easily because of the depth limit of a mosa the only think to worry is torpor since it drops very fast.and you should try to track it as fast as possible.

After you have one the only things you really need to fear are jellies and a squid meshing you through the floor.

To knock one out use your Ichthyosaur and crossbow with tranqs.

1 aim the back, you can get in two shots before it starts chasing you (it takes like 5 seconds to aggravate)

2 go to surface until he/she forgets about you.

3 repeat

4 1 quetz kibble is good enough with 10x

You can grab it with a Tuso and a Friend can shoot him with a Longneck and shocking Tranquilizer Darts from Land or an Ichty on the Surface.

On mobile 7 Tranqs in master craft crossbow and it’s out don’t use primitive or it takes 948384 tranqs

Swim in circles if you plan on taming it. It has bad turning speed so it leaves a spot in the middle where you can somewhat safely tranq it

If you are having difficulties taming this in the deep water especially when it starts running around, do what I usually do on every new map I play:

Get a Basilo (optional) > Plesi/Turtle > Tuso (Squid).

With the squid, you can look for a higher level Mosa easily & drag it to your water dino pen. You can push the Mosa in through a Behemoth gate and just knock them out safely within your base.

It’s a longer route but much safer and more reliable especially when you are aiming to get/breed high level ones.

Two ways to start taming a mosa easily, build a trap and trap it at the bottom of the sea with your kibble and narco ready, or use a tuso to grab it and either cwait 45-60 minutes for free knock out tame or take the mosa back to your water pen/any pen for safer convenient tame.

Just like with the Giga, the mosa can not be fully starve tamed as its torpor is start to drop exponentially. Best to put all your food in is as soon as you drop it ps. Gonna need at least 5 times more narcotics than what the dodo dex states

Well if they took that height limit off the wild mosa no one would ever go into the ocean again. Duna duna it that jaws no its a mosa everyone run.

Build a trap. A good one to keep it in and bad stuff out. Knocked out a 150 and a 15 and 25 mate boosted alpha mosas spawned in right on top of me.

Watch out because rarely you will find a giant lev 50 squid that will grabb your lev mosasaurand wont let go and is apparently cant be killed

Get an ammonite to rage you it will then follow you to the surface and you can then beach it and easily tranq it

Used a ac crossbow and killed a 140. It said 76 amd we hit it with like 80 and it just died. :(

One person use a squid to hold it and bring it to the ocean surface and another person to tranq it. It can't move and gets slightly torpored in the squids grip. Just do not attack it with the squid

You can take one solo, it took me about 100 arrows with a mc bow that has 200 damage