Mutualistic: both species benefit (tiny fish or shrimps known as cleaners who get into the mouth of the big fish with mutual agreement through change of color and clean inside the mouths and gills without being eaten; The cleaners as they are known benefit by feeding on the cleaned parasites from the bigger fish)

Parasitic: one benefits at the other's expense without killing the host (Fish lice who attach themselves in the fish while feeding or drains their body fluids. The fish is not able to discard it until it moves to the next victim)

Commensal: one benefits while the other is not harmed or helped (remora find its food from the sharks left over food and the shark isn’t bothered at all. The remora gets protected)