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.
How much sunlight is in the mesopelagic zone
Yes, it is.
-The Epipelagic zone (sunlight zone) -The Mesopelagic zone (twilight zone) -The Bathypelagic zone (midnight zone)
The twilight zone does not have a fixed salinity. ocean waters of varying salinity move through the twilight zone as they circulate.
dominant fishes are of the families Myctophidae and gonostomatidae, for more see Biology of fishes by Bond.
the salinity in the midnight zone is a kind of high amount
the mesopelagic zone
The piglet squid lives in the epipelagic zone (sunlight zone) until they are fully matured when they descend in to the mesopelagic zone (twilight zone).
epipelagic zone (sunlight zone)- as deep as 200 meters, until they reach full maturation, then the will descend into the mesopelagic zone (twilight zone).
Mesopelagic
The pressure in the mesopelagic zone, which is located around 200 to 1000 meters below the ocean surface, can range from around 20 to 100 times atmospheric pressure. This is due to the weight of the water above pressing down on the depths of the ocean.
The division between the epipelagic and mesopelagic zones occurs at a depth of approximately 200 meters (656 feet) in the ocean. The epipelagic zone, also known as the sunlight zone, is characterized by sufficient light penetration for photosynthesis, while the mesopelagic zone, or twilight zone, experiences decreasing light levels and is home to different marine life adapted to lower light conditions. This transition marks a significant change in temperature, light availability, and biodiversity.