it’s not so hard to tame it, you need something that can fly and some stone buildings:

1. i built 4 square stone foundation, put around it stone door frames twice to height and to any of it put 2 of ramp outside

2. just bait him to this stone box, you can do it by flying from right direction, or you can do it by walk, just bait him and quickly run to box, you can go through door frames, it can to it

3. give torpor to it, i used crossbow and tranq arrows

4. it eats ONLY fish, but i used blue kibble (to 68 lvl i spent 3 of them

5. done