Linda Pitkin / Slender grouper (Anyperodon leucogrammicus) sheltering by gorgonian sea fan and other corals on coral reef Cape Kri, Dampier Strait, Raja Ampat, West Papua, Indonesia, March 2016

Georgette Douwma / Elongate surgeonfish (Acanthurus mata) at a cleaning station with Diana wrasses (Bodianus diana). Indonesia.

Alex Mustard / Slender grouper (Anyperodon leucogrammicus) exploiting the confusion caused by and Orange spotted trevally (Carangoides bajad) hunting silversides (Atherinidae) to plan an ambush. Raja Ampat, West Pap...

Fred Bavendam / White-lined Rock Cod (Anyperodon leucogrammicus) in front of sea fan, Kimbe Bay, Papua New Guinea

David Fleetham / Transparent cleaner shrimps (Urocaridella sp) cleaning Slender / White-lined grouper (Anyperodon leucogrammicus), Fiji.

David Fleetham / Slender / White-lined grouper (Anyperodon leucogrammicus), mouth open, with Rock / cleaner shrimp (Urocaridella sp.) searching for parasites, Fiji.

Tony Wu / Bluestreak cleaner wrasse (Labroides dimidiatus) cleaning and attending Slender grouper (Anyperodon leucogrammicus). Pacific ocean, Papua New Guinea.