The urinary system includes the kidneys, ureters, bladder, and urethra. Its purpose is to maintain the volume and chemical composition of fluids in the body.

In 2007 Indian doctors reported a case of a small fish in the bladder of a 14-year-old boy. The boy claimed he was cleaning a fish tank and decided use the bathroom while still holding one of his ...

Fish maw — the swim bladder of a fish — is one of the most expensive dried-seafood products in the world. A Chinese delicacy, it can fetch $450 to $1,000 per kilogram.