Figure 17.10 Cleaner wrasse. The small cleaner wrasse, Labroides dimidiatus, removes large numbers of ectoparasites from much larger fish, such as this rosy goatfish (Parupeneus rugescens) in the Red Sea. The cleaner wrasse benefits from a reliable food source while the larger fish benefits from having a lower number of parasites.

Photo by Georgette Douwma/naturepl.com.