Do sharks urinate

Answer 1

Sharks do not urinate as most animals do. Sharks convert urine to urea; a toxic compound which is really converted ammonia. Urea is absorbed in the flesh of the shark and expelled through the skin. When a shark dies this urea is converted back to ammonia. That is why shark meat has a slight ammonia taste and smell.

"Cartilaginous fishes such as sharks, rays, and skates, have plasma that is approximately isosmotic to seawater. This unusually high osmotic concentration (compared to that of other vertebrates) is maintained by high levels of urea and trimethylamine oxide (TMAO) in the blood. In most vertebrates, levels of urea this high would damage proteins, but the presence of the TMAO helps to stabilize these protein molecules against the adverse effects of urea. Excess inorganic electrolytes, such as Na+ and Cl- which diffuse into the blood at the gills, are excreted by way of the kidneys and also by means of a special excretory organ called the rectal gland that is located at the end of the alimentary canal."

Answer 2

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