Ammonia is the major end product in the breakdown of proteins in fish.
Fish digest the protein in their feed and excrete ammonia through their gills and in their feces. The amount of ammonia excreted by fish varies with the amount of feed put into the pond or culture system increasing as feeding rates increase. Ammonia also enters the pond from bacterial decomposition of organic matter such as uneaten feed or dead algae and aquatic plants. All rights reserved. Aquaculture bio-filters and aquarium biofilters are biological filters.