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Anabantoids and CO2

In a message dated 10/25/1999 3:58:51 AM Eastern Daylight Time, 
Aquatic-Plants-Owner at actwin_com writes:

> I have Pearl Gouramis in my CO2 injected tank and they seem to do fine
>  although my cover is not tight fitting.  They were the only fish to survive
>  a CO2 mishap and spawned soon afterward.
>  > Date: Sun, 24 Oct 1999 12:22:13 +0000
>  > From: "Jan Fidrmuc" <fidrmuc at united_econ.uni-bonn.de>
>  > Subject: CO2 and anabantoids
>  >
>  > I wonder if anyone has been using CO2 injection in tanks with
>  > anabantoids (labyrinth fishes such as bettas). As some CO2 dissipated
>  > out of the water,  the anabantoids may be unable to breeth. CO2 is
>  > heavier than O2, and hence it may accumulate on the water surface,
>  > especially with a tight top cover.

anabantoids are better able to survive in oxygen-poor water than other fish 
due to specialized air-breathing organs ("labyrinth organ").  

tsuh yang chen, nyc