Alex Mustard / School of Lowfin chub (lowfin rudderfish: Kyphosus vaigiensis) swimming near the surface beneath a setting sun. Vavuu Atoll, Maldives. Indian Ocean

Alex Mustard / Brassy chub (Kyphosus vaigiensis) swimming through channel in coral reef at dusk. Alimatha Island, Vavuu Atoll, Maldives. Indian Ocean.

Jeff Rotman / Brassy Chub (Kyphosus vaigiensis) swimming along coral reef. Egypt, Red Sea

Doug Perrine / Brassy chub (Kyphosus vaigiensis) with spotted colour pattern indicating arousal, Pawai Bay, North Kona, Big Island, Hawaii, USA, Pacific Ocean.

Doug Perrine / Brassy chub (Kyphosus vaigiensis) swimming over reef, Pawai Bay, North Kona, Big Island, Hawaii, USA, Pacific Ocean.

Shane Gross / Shoal of Lowfin chub (Kyphosus vaigiensis) evading a Coral grouper (Cephalopholis miniata), Tubuai, French Polynesia, Pacific Ocean.

Shane Gross / Shoal of Lowfin chub (Kyphosus vaigiensis) swimming to avoid Coral grouper (Cephalopholis miniata), Tubuai, French Polynesia, Pacific Ocean.

Henley Spiers / Tawny nurse shark (Nebrius ferrugineus) followed by a school of Brassy chub (Kyphosus vaigiensis), Vaavu Atoll, Maldives, Indian Ocean.