Euryhaline fish can adapt to changes in salinity by regulating water and mineral balance through a process called osmoregulation.
Researchers isolated and sequenced cDNA from sea-bass, identifying aquaporin proteins AQP1 and AQP3, which show significant similarity to mammalian versions.
Salinity levels affect the expression of these aquaporins in key organs like the gill, kidney, and digestive tract, suggesting that AQP1 mainly helps with water transport in saltwater fish, while AQP3 is likely important for freshwater fish.