By: Allison Shaffer
Zen4Blue Ocean Research Author
Some animals in the ocean look like they belong in a science fiction movie, and the anglerfish is definitely one of them.
With their huge mouths, sharp teeth, strange bodies, and that little glowing lure hanging above their heads, anglerfish might not be the first animal you would describe as cute. But the more I learn about them, the more fascinated I become.
Anglerfish are actually a really diverse group of fish. When most people picture an anglerfish, they probably imagine the deep-sea species that looks like it came straight out of a nightmare. But there are many different types of anglerfish and their relatives, including frogfish, batfish, goosefish, and others. Some live in the deep sea while others can be found in much shallower water. Of course, the feature that makes them so recognizable is their lure.
In the case of the deep-sea anglerfish, the ocean is almost completely dark. Sunlight doesn’t reach these depths, so finding food can be a difficult task. Instead of searching through the darkness hoping something swims by, the anglerfish has evolved a very clever way to bring dinner directly to it.
That little glowing lure is called an esca, and in deep-sea anglerfish, bioluminescent bacteria living inside it produce the light. The anglerfish basically carries its own little fishing light through the darkness. And then it waits. A curious animal sees the light and moves closer, and the anglerfish can use its enormous mouth and powerful suction to pull the prey in.
I think this is one of those moments where the ocean reminds us just how different life can become when animals have to survive in completely different environments. What looks strange to us is actually an incredibly specialized adaptation.
And then there is the fact that the lure itself evolved from part of the fish’s dorsal fin. Over millions of years, those fin structures became this incredible little fishing apparatus that the anglerfish can move around to attract prey. How cool is that?
The deep ocean can feel like such an alien place sometimes. It is cold, dark, under enormous pressure, and still full of life that has found ways to survive there. Anglerfish are just one example of how animals can adapt to environments that seem almost impossible to us. So yes, they may look a little spooky.
But underneath that spooky appearance is an animal that is incredibly well adapted to its world. And honestly, that’s one of my favorite things about the ocean. Sometimes the strangest creatures have the most amazing stories to tell.
