Classroom lesson Β· Wildlife Β· πŸ‡°πŸ‡² Comoros

Coelacanth

A living fossil fish from the time of the dinosaurs

A large blue coelacanth fish swimming in the deep dark ocean near the Comoros islands

Photo Β· Wikimedia Commons

What is it?

The coelacanth (say: SEE-luh-kanth) is an extraordinary fish that swims in the deep ocean around the Comoros islands. Scientists thought this fish had been extinct for 65 million years β€” until a fisherman near Comoros caught one alive in 1938. It is called a 'living fossil' because it looks almost exactly the same as coelacanths that lived alongside the dinosaurs.

Tell me more

Most fish have fins that wave about like fans. The coelacanth's fins are attached to little arm-like stumps, almost like tiny legs. Scientists think these fins might show us what the very first creatures looked like when animals on Earth began to move from the sea onto land, hundreds of millions of years ago. That is why the coelacanth is one of the most exciting animals scientists have ever found.

Coelacanths live very deep β€” sometimes 200 metres below the surface, where the water is cold and dark. They grow to about 1.8 metres long (bigger than most adults) and can weigh 80 kilograms. They are steel-blue with white spots, and their scales are very tough. They swim slowly, drifting and hovering in the dark.

Fishermen in Comoros had been catching coelacanths for a very long time without realising how special they were β€” they called them 'gombessa' and sometimes used their rough scales like sandpaper. Now scientists and local communities work together to protect the coelacanth, which has become a great source of pride for Comoros. The fish even appears on Comorian coins.

In the classroom

Walk your class through this in 15 minutes.

Talk together

Discussion prompts

  1. 01What does it mean for a species to be a 'living fossil'?
  2. 02How do you think scientists felt when they discovered the coelacanth was still alive?
  3. 03Why might a fish that was unknown to scientists already be well-known to local fishermen?
Try this

Classroom activity

Create a timeline starting 400 million years ago. Mark when coelacanth-like fish first appeared, when the dinosaurs existed, when coelacanths were thought to be extinct, and when the living one was found in 1938. Illustrate each point with a small drawing.