What is the role of mucus in fish life?

The purpose of slime in the life of fish is irreplaceable and very important. The mucus helps the fish move in the water, reduces the friction of its body against the water, protects the body from parasites and various bacteria, helps blood clotting if the fish is injured somewhere, the mucus forms a protective layer on the fish’s skin and helps it move quickly in the water. Some fish defend themselves from the attack of predators with the help of mucus, which contains poisonous substances.