What type of urine do saltwater fish produce to adapt to their environment?

Saltwater fish need to conserve water due to the high salinity of their environment. To adapt to this challenge, they produce small amounts of concentrated urine. This strategy helps them retain as much water as possible, minimizing water loss while excreting waste products. By concentrating their urine, these fish reduce the total volume of water eliminated from their bodies, thus maintaining their internal osmotic balance in a salty habitat. This physiological adaptation is crucial for their survival in the ocean, where the osmotic pressure would otherwise draw water out of their bodies.