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Carbon dioxide (CO2) in fish pond water.


Carbon dioxide (CO2) in water is a gas needed by aquatic plants or microorganisms for photosynthesis.


Carbon dioxide is easily dissolved in water compared to oxygen so it often expels and occupies oxygen in the water.


an increase in the amount of carbon dioxide in the water will block the process of oxygen diffusion in water, so it will reduce the consumption of oxygen and as compensation the fish will be very active breathing. This breathing activity requires calories and will reduce the chance of eating for fish (the appetite of the fish decreases and will even disappear).


carbon dioxide content in fish ponds is 5-15 ppm. can still be tolerated by fish, provided the oxygen content is high enough.