Damselfish, gobies, and parrotfish are among the brightest and most photographed fish inhabiting coral reefs. More importantly, these creatures are the unofficial caretakers of this diverse ecosystem. Each one plays a role in maintaining the balance of our fragile reef.
Gobies
Gobies are a diverse group of small fish found in oceans, rivers, and estuaries around the world. With more than 2,000 species, they are among the largest families of fish and play an important role in aquatic ecosystems. Many gobies live close to the seafloor, using their fused pelvic fins like a suction cup to cling to rocks, coral, or sand in areas with strong currents. Some species form remarkable partnerships with other marine animals, such as cleaning gobies. These brightly colored fish establish “cleaning stations,” where larger fish voluntarily stop to have parasites, dead skin, and excess mucus removed. Species such as the neon goby (Elacatinus oceanops) and sharknose goby (Elacatinus evelynae) are well known for providing this valuable service, exhibiting a mutualistic relationship that benefits both them and their clients. By helping reduce parasite loads and improve fish health, cleaning gobies contribute to the overall resilience and balance of reef ecosystems.
Parrotfish
Parrotfish, a close relative of the wrasse, are named for their fused teeth that give their mouth a beak-like appearance. Parrotfish are plentiful and can be found all over the world’s oceans. About 80 identified species range in size from less than 1 to 4 feet in length. Schools of parrotfish graze over coral reefs like cows in a grass field. Their teeth specialize in scraping algae and invertebrates from coral and rocks. Another set of teeth is on the floor and roof of their throat. These pharyngeal teeth crush ingested materials, resulting in large amounts of calcareous materials being consumed and excreted. As a result, a single 5 lb parrotfish can produce an average of 1 ton of sand per year.
Damselfish
Damselfish are the farmers of the coral reef and rarely grow to more than 5 inches in length. Some of these small fish will cultivate, harvest, and nurture a small patch of filamentous algae throughout their life. Part of the upkeep is also to weed out calcareous algae or other biological material that is harder to digest. However, don’t be fooled by their small size and bright colors. Damselfish are highly territorial and aggressively protect their crop even from a passing diver.
