Bwap are good. I use em, too. (There's one in my Belladonna adventure thread on Random Static, a Federal G-man, er bwap...I did him in Columbo-esque fashion...seems dull, plodding, but he gets the job done & the bad guys too, no baggage involved.
In deference to the Luriani, (Ancients geneered water world humans, they can speak. IIRC, the Aquans of Gushmege (Vilani-geneered Scanian-humaniti of that sector-1st Imperium) cannot speak, but use a sign language, akin to what deaf people use.
Then, in the RIM regions(Sol Rim/Alpha Crucis), the Solomani had GenAssist (2nd Imperium) raise the Mermani. Like the Luriani they can speak, and endure deep depths, breath air/ have gills...
seems everyone has had their hand at it save the Third Imperium!