Do Fish Pee? What No One Is Talking About

Do fish pee? If you own pet fish, you recognize that they poop, yet it’s more difficult to discern whether they pee. Nonetheless, if you don’t clean the tank on a regular basis and begin scenting ammonia, there’s your solution. Yes, Fish do pee. However freshwater and saltwater fish go about it in various ways.

Have you ever before heard the phrase “to drink like a fish?” Well, unless you’re an ocean home species, that most likely suggests staying sober. Due to the fact that freshwater fish do not drink!

Saltwater fish on the other hand? They’re constantly consuming water. Yet if some fish drink regularly as well as other fish do not drink whatsoever, we’re entrusted to an evident concern: Do fish pee?

Water is vital to life as we understand it. To maintain their chemistry running efficiently, living things need simply the correct amount of water in their bodies. You’d assume that fish have it made when it involves staying hydrated, yet it’s not so very easy.

Fish gills allow oxygen to flow right into their bodies, yet they’re likewise letting water constantly escape. Ocean water is saltier than the insides of fish. So water wishes to move from the inside out to stabilize that out.

How Often Does a Fish Pee?

According to the Virginia-Maryland Regional College of Veterinary Medicine website, fish generally urinate at all times.

Saltwater fish just make a small amount of urine, as well as what little pee they make is practically as salty as the pool they pee in. Sea fish typically pee once a day as well as poop every other day.

Freshwater fish have the opposite trouble. Their insides are saltier than where they

live, so water is constantly leaking in via their skin and also gills. Its shade is similar to the naked egg we placed in pure water.

Freshwater fishes have to do away with water constantly to keep their cells from bursting, which indicates they pee a whole lot.

They’re practically peeing at all times. If I peed as long as a freshwater fish, I would certainly release up to 28 liters a day, which is about 20 times more pee than I usually make.

How Do Fish Pee?

Most saltwater fish excrete pee with the gills, while freshwater fish do so with the urinary pore. Freshwater fish have to obtain rid of all the water they take in.

Fish Kidneys

Fish have 2 kidneys. The head kidney removes wastes that go through the gills, while the posterior kidney filters waste that heads out the urinary pore. In freshwater fish, the kidneys conserve ions and excrete water. For saltwater fish, the kidneys preserve water and also eliminate ions, with the majority of this waste material exiting through the gills.

Fish Urine

While fish urine mostly consists of ammonia, that’s not all it has. Relying on the species, ammonia leaves the body mostly using the gills. The color of fish pee is much like the naked egg we placed in distilled water.

Fish urine additionally includes amino acids, a small amount of urea as well as the organic acids creatinine and creatine.

Saltwater fish urine includes a great quantity of salt, while freshwater fish urine consists largely of water with percentages of salt.

Freshwater fish create a lot of urine. Saltwater fish create much less, and also what they do excrete is quite concentrated.

Urinary Tract and Kidney Disease

Fish can experience urinary tract and kidney diseases, some of which arise from parasite infestation. Renal dropsy, typical in goldfish as well as various other carp species, is triggered by a parasite, known as Sphaerospora auratus.

Fish affected with this normally fatal condition show swelling in the abdomen from accumulated fluids as the kidneys stop working.

An additional parasite, Sphaerospora angulata, creates carp dropsy, a disease in fish and also various other carp. While the abdomen of the fish swells, the carp dropsy fish suffers eye swelling.

Fish typically die within six months after showing symptoms. The proliferative disease affects the kidney of commercially-grown young trout and salmon. In addition to stomach as well as eye swelling, fish with this fatal ailment come to be incredibly sluggish.

Do Fishes Fart?

The majority of fish do make use of air to blow up as well as decrease their bladder to maintain buoyancy which is expelled either through their mouth or gills which can be misinterpreted for a fart.

Final Thought

For fish, peeing in the yard is a big help to their neighbors. Fish pee is full of ammonia, nitrogen including substance, and also phosphorus, both nutrients that plants crave.

These additionally aid feed algae as well as coral reefs, like a fluid fertilizer that aids in maintaining aquatic ecosystems. Fish are little swimming, urinating, and nutrient recycling plants.


Dibyajyoti Bordoloi is the creator and author of, a third-generation experienced fish keeper and owner of a successful pet breeding farm. He is also a member of the Center for Wildlife Rehabilitation And Conservation (Assam), the Marine Aquarium Societies of North East India, and the Kaziranga Nature Conservancy of Assam.

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