OK, next question: identify five intelligent aquatic races, from five different SF universes. These can be anything from fully gill-breathing to amphibious to happy on either land or in the water, but they should spend much of their time in an aquatic environment and have at least some significant physiological adaptation to a water-dwelling lifestyle.
Oh, in the "Man-Kzin Wars" universe dungeon-mastered (*) by Larry Niven, the Kzinti got their "uplift" to space-going gravity-polarizing litter-scatterers from a pentagonal 5-mind species called the Jotoki, who were obligate aquatic mono-minds as fry and juveniles but in maturity linked up into 5-sets with interlinked minds and were also able to come out of the water.
Actually, that probably doesn't really count. Though there is a definite obligate aquatic stage in their life cycle.
Edit : forgot the footnote (*). Is "dungeon master" really the right term for this? Niven knew there were several Man-Kzin wars in his future history, but decided to not write about it because he'd never been in any military in his life and was sure he'd fsck it up thoroughly. But about 1990 he decided to release that phase of his future history, with the character notes from a D&D type game set in the universe, for other authors to play in. And generally it has gone well, with a dozen or so high-calibre authors playing in the universe, probably as much material in total
as Niven's entire bibliography, and only the one episode of an author "breaking the playground equipment" (Niven's words) resulting in one of the most interesting stories of the whole universe.
Is that what a "dungeon master" means? I've never actually come closer to playing D&D than the Colossal Cave.