Mutualistic relationships are when both species living closely together benefit equally from their relationship. Marine creatures in a mutualistic relationship rely on each other for food, protection, or other life functions.

There are several examples of mutualism in the ocean many of which involves species you wouldn’t even think would get together. They are able to live harmoniously and both mutually benefit when they are together. 

Here are some examples of sea creatures that have a mutualism relationship