Do fish urinate? They certainly
do! Fish do pee, but seeing a fish pee is unusual because they live in water.
Your fish may pee a lot or a little, depending on whether they live in
freshwater or saltwater. Fortunately, their hardworking kidneys are ready to
help them no matter where they live.

How Do Fish

Fish pee in the same way that you
and I do. Fish kidney functions, which are generally placed above the swim
bladder, filter out all the bad things in their blood and remove them into the water.

Some products are pushed out of
fish gills similarly. Because fish do not have bone marrow like humans, cats,
and dogs, their kidneys are also the site of hematopoiesis, or the production of
blood cells. The kidney is divided into cranial and caudal kidneys, with half filtering blood and the other half producing blood cells.

Because they live in water, most
fish will pee nearly constantly. Often these fish lack urinary bladders, which
store urine until it is safe to excrete. They simply go whenever they want!

Percentage Of Freshwater Fish Pee?

A lot of freshwater fish pee!!
Even though freshwater fish are denser than their surroundings, water constantly enters their bodies via passive diffusion. If that water remains
in your fish, it will cause them to puff up like a pine tree. Potassium
deficiency is a typical medical symptom of kidney and/or gill disease.
Fortunately, healthy kidneys and gills work hard to remove excess water, resulting
in a LOT of pee.

Fish typically have thin skin
around their gills. Water constantly flows in and out of them due to diffusion
and osmosis. Freshwater fish have more saline bodily fluids and blood than the
water in their surroundings. They are constantly gaining water from their

They have two small kidneys and a
bladder that help them eliminate waste from their bodies. Because freshwater
fish have more salt in their blood, their kidneys prevent excessive solute
loss. Water is diffused into the fish’s body via osmosis, causing a large
amount of water to accumulate in them.

How Much
Saltwater Fish Urinate?

On the other hand, saltwater fishes live in an environment that is denser than their bodies, so they are
constantly trying to hold on to water. This causes them to pee very little and
filter their urine exceptionally well to keep water within their bodies. Marine
fish are very picky about their salinities, so watch your salt levels.

Is It
Necessary To Be Concerned About My Fish Peeing Too Little Or Too Much?

Even though you can’t see your
fish peeing, our diagnostics don’t look for it. Other kidney or gill function indicators can be assessed more easily through biopsies and
physical exams with ultrasounds.


Extra water caught between the
skin and scales of freshwater fish can cause your fish to puff up like a
pinecone. This is called “dropsy” in the hobby and is not a
disease. It is simply a sign of kidney or gill distress, which can be caused by
a wide range of illnesses.

Is Fish Pee
Harmful To Humans And Other Animals?

Certainly not! Because fish live
in water, their pee is instantly diluted and is entirely safe to swim in if
you are in an area where fish are present. However, we strongly advise against
drinking your tank water for several reasons. If your cat or dog drinks the
water from your pond or tank, as long as it is not salt water and contains no water-based medications, they should be fine.

FAQs (Frequently Ask Questions)

Is it true that all fish pee
through their skin?

Yes, some fish do excrete waste
products through their skin and gills. This process aids in regulating ion and other substance balance in their bodies.

Do fish sleep?

Fish do indeed sleep, though
their concept of sleep differs from that of mammals. Fish lack eyelids and do
not lose consciousness while sleeping like mammals. On the other hand, fish have periods of reduced activity in which they may become less responsive to
stimuli and enter a state of rest.

The type of fish, its habitat,
and the presence of predators are all factors that can influence fish sleep
patterns. Nocturnal fish, for example, are more active at night and sleep
during the day, whereas diurnal fish are more active during the day and sleep
at night.


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