Do fish pee? / myLot

United States

February 19, 2026 6:35pm CST

I googled this for a kiddo. The textbook, in discussing the hydrosphere and biosphere talked about part of the water cycle being completed by animals peeing. It went on to say that instead of peeing, fish took care of their waste through the gills, flushing and filtering the "water". I will give more of an answer later, but I am asking you, "In your opinion, do fish pee?" My student also had an opinion.

9 people like this

9 responses

Amber

@AmbiePam (113042)

• United States

13h

I guess I’d say yes, in their own special way.

3 people like this

Toni

@toniganzon (73488)

• Philippines

I have seen fish poop so I guess they pee too.

2 people like this

rebelann1949

@rebelann (115992)

• El Paso, Texas

12h

Not in the same way land mammals do but all living things must have a way to be rid of waste.

2 people like this

Judy Story

@jstory07 (147514)

• Roseburg, Oregon

Yes fish pee I looked that up once for one of my kids years ago.

1 person likes this

@DaddyEvil (168306)

• United States

13h

Yes, they do. Some fish, like goldfish use their urine to drive other fish out of their territory. That's why you don't want to keep goldfish with other fish. Their pee poisons the water.

2 people like this

Judy Evans

@JudyEv (372199)

• Rockingham, Australia

That's interesting. I had no idea about fish peeing or not.

2 people like this

Eva James

@wolfgirl569 (129855)

• Marion, Ohio

36m

Yes.

Fleur

@Fleura (34073)

• United Kingdom

I don't think fish produce urine as a waste product, as mammals do, or at least only small amounts. They mostly excrete ammonia. Birds don't pee either as far as I remember, they excrete uric acid.

LooeyVille

@LooeyVille (26)

• United States

Yes they excrete their waste, therefore they "pee"