The Eastern Cleaner Clingfish

The Eastern cleaner-clingfish (Cochleoceps orientalis) has its job title in its name: “cleaner.” They prove invaluable to larger fish by removing parasites to keep the larger fish clean and healthy. To do their job, Eastern cleaner-clingfish move by clinging onto different surfaces instead of swimming themselves. They can hold onto kelp or sponges with a strong grip before moving onto a fish. The Eastern cleaner-clingfish also lays its eggs while holding onto these stationary objects. The eggs are then guarded by the father from any possible threats.

The Eastern cleaner clingfish cleans parasites off of larger fish.
Credit: 

Tony Brown, Flickr