The research may improve how tilapia—the second most farmed fish in the world—is raised and managed for food, experts say. (Read about the decline of American seafood.)
Scientists already knew that pee played a role in how Mozambique tilapia, Oreochromis mossambicus, interact with each other, but the exact mechanism was a mystery.
It all starts with the tilapia's social structure, which is surprisingly complex for a creature that many will know only as a breaded fillet.
"It's actually a quite interesting fish, because tilapias are highly social animals, so the males form hierarchies in a so-called spawning arena," said study leader Tina Keller-Costa, of the Centre of Marine Sciences at the University of Algarve in Portugal.
Read further at National Geographic