Alien population on my colonized planet? |
I had a strange thing happen to me last night.
I colonized a huge planet that was not my races breathing atmosphere so I could only build 5 structures and pop max was minimal. Later on in the game I went to move more population to it and noticed two different alien races living on this planet who’s breathing atmosphere was the same as this planet. I then decided to remove all of my races population and I can now build 25 structures with max pop of 8000 mil. This works great for me, but how did this happen? I didn’t tell these races they could populate my planet nor was the planet ever concurred. In fact I haven’t concurred any alien planets yet so I wouldn’t have had any alien population in my empire. I do have peaceful treaties with them, but what treaty would allow them to add population to planets you have colonized?
Is this normal or is it a bug?
Migration pacts are actually
Migration pacts are actually bugged, and there are only two-way migrations no matter what you appear to pick. I found some of my population somehow on an enemy planet despite never signing any me-to-them treaties. Now I hijack their colony ships and fledgling planets for slaves instead.
Use espionage
The capturing of ships in combat doesn’t work properly at the moment so it’s probably spies corrupting the natives and encouraging them to defect
Typical example of this
Typical example of this game's current state: tons of great features with which you can play out virtually any scifi book/series/movie... but the bugs prevent you from doing so 
however, at the speed Aaron is doing, we should be happily capturing millions of helpless people in cryogenic freeze and dumping them in the hellholes of our empire for slave labor in about a few weeks 
Ship capturing can be partially fixed by hacking
Or you can use spying, that works also.
Right now, my empire's fleet essentially consists of roving bands of pirate ships hijacking enemy colony ships, enslaving their passengers and looting the ship for supplies and ordinances before burning it. It's fun.
One of your treaties might
One of your treaties might allow their citizens to emigrate to your empire, I believe they naturally pick a planet whose atmosphere they can breathe. Take a look at the treaties you have with the other empires and see if you have an Immigration pact with one of them.
-Currently subjecting multiple galaxies to the doom of conquer or blackholes