Botched bungicide?
We don’t DO that here at the Flying Castle, for that is precisely what such foolishness would be; the pliosaurs in the moat would NOT have missed.
The plesiosars are into eating fish, principally Tilapia.
They seem to enjoy human company, even being playful with an occasional swimmer, tossing him into the air. I haven’t had any reports of anyone injured, although quite a few have gotten the fright of their life!
The real thrill comes from “accidentally” falling from the inside of our hull canopy, when ostensibly doing maintenance up there. We have crews standing by twenty-four seven, for the stray meteorite puncture of the “glass”.
We can’t afford to lose atmosphere, so we stay alert. At one-third gravity, the fall isn’t as dangerous as it sounds, and each crewman (crewwoman) has a glide-chute for emergencies.
Somehow they manage to have a lot of emergencies.