Believe it or not, fishes actually do pee. Fresh water fishes are constantly producing rich urine because they are always taking up the water. Salt water fishes produce small amounts of urine because they face enviromenmental stress! They are always losing water due to osmosis. So they use their pee. Sharks and rays have another way of peeing. But all in all, fishes actually do PEE! Finally, this long time question has been answered. Fishes actually do pee! They eat and drink their own pee because they have to. How cool is that! Here’s one thing I suggest for your curious boys and girls. Don’t try to stare at your fish until it starts peeing, because you’ll be staring for quite a while!
Here is a link telling you how fishes pee!
http://www.suite101.com/article.cfm/hydroponic_gardening/29024
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