If you are a fish farmer, you know that they defecate, but it's harder to affirm whether they urinate or not. However, research has shown that fishes do urinate but urine is always in liquid state; unlike feaces that can be seen at the base of the pond.
Truly, fishes do urinate; but the mode of urine passage varies with the habitat. Freshwater fish and saltwater fish go about it in a different pattern. The Virginia-Maryland Regional College of Veterinary Medicine asserted that fishes basically urinate all the time.
How a Fish Urinates
A fish urinates through two channels; either through its gills or through a "urinary pore." The latter eliminates urine that has been filtered via the kidneys. Saltwater fishes excrete most urine through the gills; while freshwater fishes do so through the urinary pore. Saltwater fishes take in a great deal of salt and must excrete it. Freshwater fishes have to get rid of all the water they take in.
Fish Kidneys
A fish has two kidneys. The anterior kidney filters out wastes that go through the gills, while the posterior kidney filters wastes that go out the urinary pore. In freshwater fish, the kidneys save ions and excrete water. For saltwater fish, the kidneys conserve water and eliminate ions, with most of this waste material exiting through the gills.
Fish Urine
While fish urine primarily consists of ammonia, that's not all it contains. Depending on the species, fishes excrete ammonia primarily via the gills. Fish urine also contains amino acids, a small amount of urea and the organic acids creatinine and creatine. Saltwater fish urine contains copious amount of salt, while freshwater fish urine consists primarily of water with small amounts of salt. Freshwater fish produce a lot of urine. Saltwater fish produce far less, and what they do excrete is quite concentrated.
Here is how fishes pass out liquid waste, urine, from their body system.
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