It only takes 9 kibble to tame a 140, please update

Do not use rockets you lose over 50% taming effectiveness. Use a skiff and cannons

To tame these, you have to learn Whãle from, Dory.
Ahem.
"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.

Its much easier to knock out with a Mek cannon all you need is one shot to K.O. if you can make a mek on your server its the easiest method by far.

Singleplayer taming is so hard. I had nobody to aim the cannon, and I'm currently waiting for the astercetus to wake up. I struggled so hard. He's a blue level 8. LEVEL 8. Dododex says there's a 93% chance of death for the cannon for a level 8.. Pretty lucky, eh? Singleplayer taming is.. Hard. Not impossible, though. I managed!

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

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.

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

The best way to tame it is with a skiff armed with 2 Canon at the front of it.
Shoot one Canon first, wait for the whale to come to you, then shoot both Canon : it sleeps

I used a ufo with a canon didn't take long to knock out and was able to do solo

Just grapple to its head and extend the line. It will push you back far enough to fire rockets and not get hit.

Mek cannon one shot KOs any level.

If you can’t afford a hover skiff then get on your bloodstalker equip a rpg and just shoot at it

Get a mek,put the rocket launcher attachment on it,then shoot at its head

Tranqable with rockets so use that if its cheaper

Pretending to molest it while it’s unconscious will not only lower taming effectiveness, by it also didn’t give consent so you’ll go to jail.

You need to use a mek to get the work done, the first thing you need to do is let it agrrow on you so shoot it with a dart or something then use use the mek to shoot rockets ate his head like the titanosaur method

Its a knockout tame, get a cannon and shoot it's face

Get a mek from extociont and the gun it takes 5 shot to knock out a level 1000.