Cleaning wrasse
Fig. 16: A cleaning wrasse (lat. labroides dimidiatus) is helping a barb to get rid of parasites. Dive #352: "Dungong Wreck", Sabang, Mindoro Island, Philippines — EXIF: Nikon D200; Δt=1/250 s; f=60 mm; f/5.6; ISO 100; 2009-11-06 5:43:34