A bioluminescent species of fish, known as the sharvo fish, originated from the planet of Castilon, their native world. Following the submersion of the Colossus platform, these fish were observed congregating in the vicinity, forming large schools. It was rumored that some stormtroopers, expelled from the largely submerged station due to a scheme devised by Kazuda Xiono and Neeku Vozo to liberate the Colossus from its occupiers, met their end as prey for these fish.