Pinnate batfish, Platax pinnatus

Adult pinnate batfish are large, beige fish that school in the open ocean. However, the young live on coral reefs where there are many more predators. The juvenile batfish mimic a toxic flatworm, which predators avoid. The small fish is almost identical in colour to the flatworm and swims in the same exaggerated manner, enhancing the masquerade.

Raja Ampat, West Papua, Indonesia

Nikon D800, Nikkor 105mm macro, 1/125, f/11, ISO 100, twin INON Z240 strobes, handheld, Subal underwater housing

by Richard Smith, United Kingdom