There is competition, mutualism, commmensalism, parasitism, and predation. There is competition, mutualism, commmensalism, parasitism, and predation.
The Clown or Anemone fish lives in a "Symbiotic" relationship with its host Anemone in that they both depend on the other for food and/or protection. It is not a type of "commmensalism" where only one actually benefits from the relationship. In this relationship they both benefit from each other so this relationship is properly termed or defined as Symbiosis.
Mutualism - relationship between two organisms where both organisms benefit. Some symbiotic relationships are 'obligate', meaning that both symbionts entirely depend on each other for survival. e.g. Clownfish and Sea Anemones.Commensalism - relationship between two organisms where one organism benefits but the other is unaffected (neither benefits nor is harmed). e.g. Barnacles and Whales.Parasitism - relationship between two organisms where one organism benefits but the other is harmed by it. e.g. Ticks and Humans.Amensalism - relationship between two organisms where one organism is killed by it and the other is unaffected (neither benefits nor is harmed). e.g. Allelopathy - where a plant secretes a substance which kills other plants around it, stopping competition.
Lynn Margulis is well-known for proposing the endosymbiotic theory, which suggests that eukaryotic cells evolved through a symbiotic relationship between different types of prokaryotic cells. This theory provides an explanation for the origin of organelles such as mitochondria and chloroplasts.
The four types of symbiotic relationships are mutualism, where both organisms benefit; commensalism, where one organism benefits while the other is unaffected; parasitism, where one organism benefits at the expense of the other; and competition, where both organisms are negatively affected by each other.