Keep a close eye on your pond fish tonight and tomorrow. In low pressure and stormy weathers, the oxygen is virtualy sucked out of the water. Make sure your pumps are turned right up for maximum ammounts, don't turn off waterfalls or fountains, keep the water agitated.
And were still warm remember, we hav'nt reached cold weather temps yet.
When the air pressure is low, then the oxygen concentration gradient of air to water is less steep. Thus, there is less force driving oxygen into the water. Weather conditions where low air pressure is dominant, such as stormy, thundery, hot and humid conditions found at certain stages of the British summer, leave the koi pond susceptible to drops in oxygen concentration. Biological The living organisms in the pond are all dependent on oxygen. The fish, filter bacteria, invertebrate and other microscopic life all need a minimum level of dissolved oxygen to survive. The plants and algae in the pond also require oxygen for the same reason as animals. The dissolved oxygen is constantly being removed, so oxygenation at the water surface is essential to replace this removal. Another source of oxygen replenishment is from the plants and algae themselves. During the daylight hours they photosynthesise, using the energy of the sun to fix carbon dioxide present in the water. This process gives off oxygen as a waste product. Photosynthesis only occurs during the day, so at night the plants continue to respire in the same way as animals. So it is unwise to rely on oxygenating weeds to provide your fish with oxygen. The sludge and detritus in the pond and filters also place a demand on the oxygen levels in the pond. The micro-organisms that break down this waste matter rely on oxygen, and the greater the amount of sludge present, the larger the demand on oxygen levels.
Dead and gasping fish at the surface of the pond after periods of heavy rain storms can indicate that insufficient levels of oxygen exist in your water source.
This can be caused by heavy inflows of cool rain water combined with a mix of surface water low in oxygen further reducing the low levels of oxygen existing in your pond. This is more likely to occur in areas of ponds that are less than 6 feet deep.
Heres an example: http://www.cbc.ca/news/canada/toronto/c ... -1.1389140
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