How does mucus help salmon?

Mucus helps salmon by providing a protective barrier on their skin and gills, which helps prevent infections from pathogens and parasites. It also aids in osmoregulation, helping to maintain the balance of salts and water in their bodies as they navigate different aquatic environments. Additionally, mucus can enhance their ability to swim by reducing friction in the water. Overall, it plays a crucial role in the health and survival of salmon.