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From: Gordon J. Mengel, Special Projects Director/Aquaculture
Time: 8:22:17 AM
Remote Name: 188.8.131.52
According to the water quality parameters most often cited for tilapia (refer to The Council's "species specific" manual titled: Tilapia), the optimum operating level for carbon dioxide in culture water is less than 50 ppm. The lethal limit is estimated at around 75 ppm. With fish, around one pound of carbon dioxide is released for every pound of oxygen consumed. Carbon dioxide dissolves easily in water and, therefore, levels should be monitored. In classroom production systems, unless you're running at very high stocking rates, carbon dioxide shouldn't be a problem given adequate aeration for the system. If high concentration is noted, carbon dioxide can be "stripped" from the water through increased aeration and mechanically by agitating the water. Don't forget that the carbon dioxide has to go somewhere so the room in which the system is located should also be adequately ventilated.