What is the salinity of the mesopelagic zone?

The salinity of the mesopelagic zone, which extends from about 200 to 1,000 meters below the ocean surface, typically ranges from 34 to 36 parts per thousand (ppt). This zone is characterized by relatively stable temperature and salinity levels compared to the surface and deeper waters. However, salinity can vary slightly based on geographic location, ocean currents, and the influence of freshwater inputs. Overall, the mesopelagic zone maintains a consistent salinity that supports a diverse range of marine life.