 Ammonia can have a number of detrimental effects on pond fish such as disrupting the ability to regulate water and salts, it may also damage delicate gill tissue, causing swelling of the tissue which may hinder the absorbtion of oxygen from the water.
If the water becomes polluted with ammonia, regular partial water changes need to be undertaken to reduce the concentration of the pollutant.
In the early stages of establishing a filtration system on the pond, it may take several weeks before the ammonia level in the water begins to drop.
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