Noun
English Wikipedia has an article on:osmoregulationWikipedia
osmoregulation (countable and uncountable, plural osmoregulations)
The homeostatic regulation of osmotic pressure in the body in order to maintain a certain water content (concentration of electrolytes, pH, etc).
Physiology dictates thermoregulation, osmoregulation, reproduction, metabolic rate, and many other aspects on sea lion ecology including but not limited to their ability to dive to great depths. Source: Internet
Smolts spend a portion of their out-migration time in brackish water, where their body chemistry becomes accustomed to osmoregulation in the ocean. Source: Internet
The physiology of fish is also specially adapted to compensate for environmental salt levels through osmoregulation. Source: Internet