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.

If I can’t use the Tek sciff what is the easiest way to tame one

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

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.

Easiest way to tame this creature is to use a mek with a m.s.c.m launcher one shot and it will knockout!

Taming with a mek makes it loose roughly 40% efficiency, if you have got a skiff its better to use 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

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

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!

Mek cannon one shot KOs any level.

Tranqable with rockets so use that if its cheaper

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

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

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

It is possible to use a quetz with a canon mounted on its back with a platform saddle, although aiming can be a pain.

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

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

Theres an issue for me in Singleplayer where they teleport away never to be found again if their close to being knocked out using the Bloodstalker and Rocket Launcher method. The easiest way for me is to lure it near the land and fire a Cannon Shell from a mek. People say to use the Skiff and Cannon method but it might teleport away aswell.