The Mysterious Barreleye: The Fish with a Transparent Head

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I have always been fascinated by the mysterious creatures of the deep sea. Whether it’s their grotesque appearance, their alien-like features, or the way they resemble mythical beings from old sailor tales, they never fail to spark my imagination. The thought that our planet harbors such extraordinary and little-known beings fills me with a sense of wonder. Observing such creatures makes me feel like a child again, discovering the world’s hidden secrets.

Deep in the ocean, between 600 and 800 meters, lives an extraordinary and almost alien-like creature: the Macropinna microstoma, better known as the barreleye. This deep-sea fish has intrigued scientists for decades with its transparent head and tubular eyes, capable of rotating within its skull. But what makes this animal so special? Let’s find out.

A Surprising Discovery

The barreleye was first described in 1939, but for many years, scientists could only study dead specimens caught in deep-sea nets. It wasn't until 2004, thanks to underwater cameras from the Monterey Bay Aquarium Research Institute (MBARI), that this fish was observed in its natural habitat, revealing astonishing details about its anatomy and behavior.

A Unique Feature: The Transparent Head

One of the most incredible aspects of the barreleye is its transparent head, which allows scientists to see through its skull. This extraordinary adaptation protects its sensitive eyes from the light above and enables it to detect even the faintest bioluminescence of prey.

The barreleye’s tubular eyes were once thought to be fixed in place, but researchers discovered that they can rotate nearly 90 degrees. Normally, they point upward to detect prey swimming above, but when needed, they can shift forward for better directional vision.

Survival Strategies

The Macropinna microstoma thrives in an extreme environment, facing high pressures and minimal light. It primarily feeds on small marine organisms like crustaceans and siphonophores, colonial jellyfish-like creatures from which it often steals food.

Scientists believe that the barreleye relies on its exceptional eyesight to locate prey in the abyss. It moves with great precision using its well-developed pectoral fins, allowing it to maintain a stable position in the water.

Recent Research and Curiosities

Studies on the barreleye continue, with scientists aiming to better understand its role in deep-sea ecosystems. MBARI has released several videos showcasing this fish in its natural habitat, helping to dispel myths and expand our knowledge of deep-sea life.

For those interested in seeing the barreleye in action, here is an MBARI video capturing this incredible fish in its natural environment: 

Source - YouTube - MBARI video


The barreleye is a perfect example of how nature develops astonishing adaptations for survival in extreme conditions. Its transparent head and rotating eyes make it a true evolutionary marvel. Thanks to modern research and advanced technology, we can now appreciate the beauty and mystery of creatures that were once hidden in the ocean’s darkness.

Sources and Further Reading

What do you think of this fascinating deep-sea inhabitant? Would you like to discover more mysterious ocean creatures?

Popular Tags:

#Barreleye #Macropinnamicrostoma #Deepseafish #Transparenthead #Tubulareyes #Abyssalcreatures #Oceanmysteries

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