Symbiosis

Symbiosis means "living together". Symbiotic relationships are very common in the ocean, especially among animals living on coral reefs. There are several kinds of symbiosis: "mutualism" is a partnership in which both animals benefit; "parasitism" is a relationship in which one animal benefits at the expense of the other; "commensalism" is a term used to cover all other kinds of symbiosis - usually relationships where one partner benefits, while the other is neither helped nor harmed.

Shark with Remora	Jellyfish with Fish	Eagle Ray with Jack
Crabs and Urchin, Indonesia	Crab and Jellyfish	Crab with Urchin
Squat lobsters, Indonesia	Parasitic Isopods, Indonesia	Anemone with Commensals, Indonesia
Shrimp on Sea Cucumber	Shrimp on Bubble Coral	Shrimp on Fire Urchin
Decorator Crab	Decorator Crabs	Sponge Crab
Wire Coral Goby	Blind Shrimp and Goby	Gobies on Soft Coral
Batfish with Cleaners	Shrimp on Nudibranch	Shrimp on Featherstar
Crab on Sea Anemone	Crab on Jellyfish	Boxer Crab with Anemones
Brittlestar on Sponge	Anemonefish	Crab on Barrel Sponge