<snip> >anabantoids are better able to survive in oxygen-poor water than other fish >due to specialized air-breathing organs ("labyrinth organ"). <snip> The point of the original message was related to the *air* above the water surface that anabantoids breathe when they go to the surface. If that air is loaded with CO2 aren't they going to sufocate ? IME no. -Ivo Busko Baltimore, MD