Fred Bavendam / Yellowfin Goatfish (Mulloides vanicolensis) often gather in large schools during the day and disperse at night to feed, Great Barrier Reef, Queensland, Australia

Fred Bavendam / Yellowfin Goatfish (Mulloides vanicolensis) often gather in large schools during the day but disperse at night to feed, Great Barrier Reef, Queensland, Australia

David Fleetham / Yellowfin goatfish (Mulloidichthys vanicolensis) schooling in underwater cave, diver in background. Kauai, Hawaii. March 2017. Model released.

Linda Pitkin / Yellowfin goatfish (Mulloidichthys vanicolensis), school on coral reef. Sha'ab Claudio, Fury Shoal, Egypt, Southern Red Sea.

Linda Pitkin / Yellowfin goatfish (Mulloidichthys vanicolensis), school on coral reef. Sha'ab Claudio, Fury Shoal, Egypt, Southern Red Sea.

Linda Pitkin / Yellowfin goatfish (Mulloidichthys vanicolensis), school on coral reef. Sha'ab Claudio, Fury Shoal, Egypt, Southern Red Sea.

Jordi Chias / Yellowfin goatfish (Mulloides vanicolensis) inside lagoon Toau Atoll, Tuamotu archipelago, French Polynesia, Pacific Ocean.

Pascal Kobeh / School of Yellowfin goatfish (Mulloidichthys vanicolensis), coast of Dhofar and Hallaniyat islands, Oman. Arabian Sea.

Pascal Kobeh / School of Yellowfin goatfish (Mulloidichthys vanicolensis), coast of Dhofar and Hallaniyat islands, Oman. Arabian Sea.

Pascal Kobeh / School of Bronzestriped grunts (Pomadasys taeniatus) and a school of Yellowfin goatfish (Mulloidichthys vanicolensis) in the background, coast of Dhofar and Hallaniyat islands, Oman. Arabian Sea.

Roland Seitre / Yellowfin goatfish (Mulloidichthys vanicolensis) shoal, Amedee Islet / Ilot Amde, Noumea, South Province, New Caledonia.

Juergen Freund / Schooling Yellow-striped Goatfish (Mulloidichthys vanicolensis) Raja Ampat, West Papua, Indonesia