The Gamma World editions I have sure have a lot of mutated sea creatures.
Not counting stuff like flying fish, there are a lot of acquatic-only, shoreline-only, and
It's a system surprisingly well stocked for exploring underwater.
Metamorphosis Alpha - 0 fish, as befits a spaceship, I suppose.
Gamma World, 1st edition - 45 bestiary entries, 9 fish or mainly aquatic creatures.
Gamma World, 2nd edition - 58 bestiary entries, 11 fish or mainly aquatic creatures/plants. Plus at least 1 more that is dual-use (land variant, aquatic variant.)
Either the writers really liked mutating fish, or Gamma World expects GMs to send the players into rivers, lakes, and oceans with regularity.
It's just a curiosity, really - that seems like a lot of water-centric encounters. I don't recall encountering many of these or using basically any of these back in my GW games. I've stolen some for fantasy games (stone fish, say) but that's about it.
Any Gamma Worlders out there think, finally, a system with a lot of fish? Or did it seem strange to you, too?