So, on the way though a peaceful galaxy, an isanth noticed a alien planet was not far off course. So, he thought, he could just be a little longer. So he went there, and noticed something different: instead of the regular tentacles, there where some colourful ones. He shot one open to see what happened. a mist came out, so he was not impressed. He flew back to the station, but on the way a tentacle creeped out of the storage. It was a baby pirate.
Nobody knows what happened, some say its somehow tore him apart but others say it strangled him. Either way, it took over the ship and spread its spores thought the station. When the crew found out, they evacuated the station. The only way to stop it was to burn the station, but that was impossible from the fact their was no air. Anyways, the baby pirate entered a build block and, based on what he could figure out from scientific logs on the station, built it into his own.
He also used to resouces on the station to mass-produce isanths, the only thing he knew. The turrets where reprogramed to destory anythign not made by him. The zero-g enviroment affect the growth of pirates, making it look a bit diffrent. Due to mistaking them for food, pirates commonly "eat" ice crystals. This make what we know today as "tentacles" on pirate ships.