Jelly Nanny

Songda Cai's Image

A trevally stared out from inside a jellyfish. Far from being trapped, the young fish was exactly where it wanted to be: swimming under a jellyfish’s bell to seek refuge from predators deterred by its host’s sting. Songda spotted this couple while night diving and captured their vibrant colours against the darkness.

At least 80 species of fish turn to jellyfish for protection; the jellyfish do not usually suffer or benefit from this practice. However, if seawater grows more acidic, as is predicted with climate change, it could affect the senses of the fish, causing them to become less attracted to their hosts. They may then spend more time in the open, exposed to predators.

Behind the lens

Songda Cai

Songda Cai


An interest in exploration from a young age led Songda to pursue black-water photography. He has since won numerous awards in international photography competitions and has been published in many renowned magazines. For Songda, being able to explore the ocean is one of the most wonderful experiences in life, and he hopes to show its unique beauty through his work.

Image details

  • Nikon D850
  • 60mm f2.8 lens
  • 1/250 sec at f20  •   ISO 500  •   Seacam housing  •   Seaflash 150D strobes  •   Under Water Scubalamp lights
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