Comment on Mosir by Dain-Siegfried

Thanks. Microbes and extremophiles, they were as let down as you are. There were a few rudimentary fish looking bastards on Europa but they tasted weird and scared small children. Still the settlers of Europa have taken great care to ensure no introduced species messes with the local ecosystem too badly and have made genetic alterations to that effect, and some neat crossbreeds have started appearing here and there.

A few evolutionary biologists made a fuss that the colonisation of Ganymede might destroy the budding life there, but between saving some bacteria and terraforming a moon larger than Mercury the colonisation lobby won out.