Its a silly question, but do fish ever get thirsty and pee?

Answer 1

Not a silly question at all! The answer is that it depends on the fish and its environment.

Marine fish are typically hypotonic (less salty) to their environment. So as a result, they actually tend to dehydrate (lose water to the environment right through their skin). So to keep up, they have to actively drink. As this increases their salt intake, they compensate by actively expelling salts via their gills.

In contrast, freshwater fish tend to be hypertonic (more salty) to their environment. As a result, water tends to flow through their skin and into their bodies via osmosis, or they tend to over-hydrate. So as a consequence, they actually expel large amounts of relatively dilute urine (basically ammonia).

That all said, there are still other fish, known as osmoconformers, whose body condition fluctuates with the environment, so they tend to produce more moderate amounts of "urine" that they use to expel nitrogenous wastes.

Like I said... not a silly question at all!

Answer 2

Peeing we can check on, but lacking talking fish, thirsty is a bit tough. Fish excrete though one opening, so we have to assume that fluids leave with bowel until someone tells us otherwise.

Answer 3

oooooo look at him above little swatty swat lol i dont know lol interesting tho!

Answer 4

you my friend,have to much time on your hands