Don't use mek because the astrocetus takes first the torpor and then the damage. The effectiveness will go down.
We tamed a 130 with mek and Kibble and get a 136 -.-
I think the stronger the weapon the more you loose the effectiveness, so the "best" way is to knock out with rocket launcher.
It's the same effect with rock elementals.
Wildcard should repair that.
To tame these, you have to learn Whãle from, Dory.
"Ooo Ooo" "OoWaoooo" "Huff. Huff."
"Incomprehensible Whãle Noises"
Then Wåla! It is tamed!
Use a bloodstalker and a rocket launcher, jump around to its face and shoot it with rockets until it knocks out. Jump off the stalker and land on the whale to quickly feed it.
Taming with a mek makes it loose roughly 40% efficiency, if you have got a skiff its better to use that
Do not use rockets you lose over 50% taming effectiveness. Use a skiff and cannons
DONT AND I REPEAT DONT USE THE ROCKET LAUCHER ON THE SKIFF IT WILL DESTROY THE SKIFF AND KILL YOU
The best way is to use the Tek skiff which you unlock after the boss fight(like the saddle) and have cannons mounted on it. Probably easier with multiple people
You can actually knock it out with a Mek Cannon if you do not have the Tek skiff.
Obtain a Tek replicator from tier 3 crates in the shop, and craft the Mek from the engram
If you get an astrocetus to fly towards a gate and then close it so it’s head is sticking out, you can shoot it with the m.c.s.m and lose no effectiveness