problems associated with carbon dioxide CO2Symptoms: Shortness of breath, loss of appetite. In the long term -slowing growth in young fish. However, these symptoms can also be caused by other reasons.
- CO2 may contribute to acidosis.
- high concentration of free CO2 can cause hypoxia aquarium fish, especially those that are adapted to life in the tumultuous, oxygenated streams. Prolonged exposure
- abnormally high for this type of fish, but not lethal concentration of CO2 can cause kidney damage as a result of calcium deposits there.
- Due to the high CO2 concentrations in fish may decrease the ability to cope with other stressors.
- too low CO2 concentrations less than 1 mg/liter can cause hyperventilation in fry and cause death. Tolerability of high CO2 concentrations between fish species differences exist. Some fish are able to gradually adapt to the increased concentration of carbon dioxide, but only as long as it is not too high.
Causes . High concentrations of carbon dioxide in the aquarium water affects the ability to deliver oxygen to the fish its tissues and thus may lead to hypoxia. Hypoxia caused by high levels of CO2, most often occurs during transportation and in overcrowded aquariums. Carbon dioxide emitted during the respiration of fish, can reach a critical level of about 25 mg/liter. The critical concentration of carbon dioxide for some particularly sensitive fish may be lower than this, and the boundary of tolerance may drop further if the concentration of dissolved oxygen is low.
Prevention . Sufficiently intensive circulation of water and ripples on the surface this may be achieved by filtration and aeration will facilitate the conclusion of carbon dioxide into the atmosphere. Since the plants in the dark emit carbon dioxide, densely planted aquariums should have enough intensive aeration. Forcing the CO2 to increase plant growth should be used with caution.
Avoid overcrowding your tank during transport do not pack too many fish in one package or big fish in small packages too. During long trips serve to carry oxygen or packages of fish in containers with lids that can be opened periodically to freshen the air.
- aeration and water circulation.
- Allow newcomers fish that have signs of respiratory distress, get yourself in good oxygen saturation and lack of water stress -for example, in the privacy of a quarantine aquarium. During this recovery period, avoid too strong aeration or water circulation, because it may amplify stress. Provided that the water before starting the fish was well oxygenated and CO2 content in it was small, normal aeration will be quite enough.
- suffocate fish is sometimes possible to revive, if carefully keep her in an aquarium in a horizontal position and slowly move back and forth to the water seeped into her mouth and out through the gills. Once the fish starts to breathe on his own, it should be released to avoid further stress.
Note . Commercially available test kits for the measurement of carbon dioxide in the aquarium water. Usually there is no need to control the concentration of this gas, except when it serves a purpose in the aquarium.