Actually pretty easy to tame/knock out. Slap some cannons on a tek skiff, hit it's head a couple times (hitting other areas won't do torpor damage)and when it is knocked out, simply feed it some extrodinary kibble or meat and BOOM! You have yourself a giant space whale! Now mine some ambergris as ordance and build a tek saddle and you should have a fully functioning B-17 Carpet Bomber with gunner turrets. (You cannot breed them, so be careful!)

Tek skiff+ Rock turret= tame space whale

Please understand that the Astrocetus is NOT, and I repeat NOT a water creature. This space whale lives in Genesis, Lunar Biome.

-Abyss

I prefer to use rocket if you don’t know how to aim

Boutta hop on to genesis and knock one out!

Got all these comments but not one says to use cannon stryder with two behemoth gates place one down prior of whale going into it then place one after whale is stuck.

I’d recommend a mek with the M.S.C.M, get close to its face, shoot its face and when it runs, cryopod and go follow it and repeqt

NOTE:

I would only try this on servers with boosted weight

Please add them to the tamable flair

Hover Skiff makes this easier but isn’t necessary! They aggro very easily to player structures, I got my first one mad at a stone dino gate on the ground. Once it’s stuck to the gate, put a couple cannons down (this is important- they’ll run away faster than 1 cannon in most cases) and put em to sleep. 2-3 cannons and 3-4 cannonballs.

If you use RPGs make sure you have more of them they will break possibly also be quick to use a mek siege cannon that's effective this guy will teleport away if you dont knock him out quick. also if you use a cannon on a hover skiff make sure your not flung off by this guy. Your welcome.

Use a cannon to knock it out with a rocket launcher it’s one hit from teleporting or before it dies

it is 2 cannon balls on a 130, not 4 i had a ruined tame because of this

Used a cannon mounted on a pillar and ceiling on official, shot in the head and knocked out after agro-ing with a bloodstalker to the cannon

I recommend not using a tek suit and rocket launcher because he moves so fast and when you nearly knock him out he warps

Great for bombing a base or mass transport. In to servers this is your b-52 flying fortress

So, after doing a whole bunch of testing. an easy way to tame a level 250 at most so far is four cannons on the ground 2 middle aimed up 2 and the side one aimed slightly in and up, find your target, gain aggro run and shoot rockets at it while luring towards cannons at the cannons wait till its almost too close for comfort and tun past your cannons firing all at once (less cannons and rockets during kiting for lower levels duh).

Rockets work just as well as cannon balls. I recommend using a mech tho with the rocket attachment. It's an instant knock-out.

You can use a rocket launcher to knock it out

It can swim, it's just unfathomably slow. Flight is also slow but builds up speed to a point comparable to a quetz or Argy. Aside from that, either I'm using hyperspace wrong, or it only teleports you maybe 100' ahead or so.

These things can swim! Otherwise they would have an oxygen stat, right? Can someone test this in the ocean biome, and take the whale to it's home on earth?