Fish do pee! Freshwater fish pee much more than saltwater fish though. The reason is that freshwater fish need more minerals and less fresh water so they excrete all the extra water and absorb the minerals. Saltwater fish need more access to freshwater so they excrete much less urine and lose the salt from their gills.
Yes, fish do pee. The process is called osmotic regulation, whereby fish drink copious amounts of water and produce only a little but very concentrated urine. In general, fish are composed mainly of water, and as they swim in water, their bodies and gills function as semi-permeable membranes, keeping materials out and regulating their body temperatures.
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