It's called mutualism and it's because both organisms benefit from each other.
Sea anemones are known for eating a wide variety of different fish and sea life. These include krill, shrimp, and tangs.
Clown Fish
A clown fish A clown fish
The relationship of the clown fish and sea anemone is symbiotic in that the clownfish, having a coating of mucous that makes it immune to the anemone's deadly sting, can swim in safety in the anemone's tentacles, meanwhile attracting other fish as food for the anemone.
Loach.
because they have a special kind of goo on their skin that keeps them from feeling the sting. Or a better answer would be. The clown fish will swim around the anemone picking up some of its cells. After a few passes, the clown fish will have enough cells to trick the anemone into thinking that the fish is an anemone itself.
Clown fish.
Grazing increases root production. This could only be described as symbiosis in a very loose sense. Generally symbiotic relationships are much more dependant ...such as the termite and its gut bacteria or to a lesser degree the mutualism of an anenome and a clown fish.
clown fish
Marlin is a clown fish.
swim
Clown fish and the anemone both do favors for each other. The anemone provides shelter for the clown fish and the fish cleans it in turn i guess. In that case i always say research and don't be lazy.