What Do You Call a Fish with No Eyes?

Fish are fascinating creatures with their traits. One thing that makes fish stand out is their eyes, which are crucial to their life. But have you ever heard the joke? What Do You Call a Fish with No Eyes?

The answer to “What do you call a fish with no eyes?” is “Fsh” (without the letter ‘i’).

It’s a simple joke, but it makes you think about how fish are built and how vital eyesight is for fish and other watery animals. Fish have a lot of different ways to help them live in water, and one of the most important is their eyesight. But what happens if a fish’s eyes stop working? In this piece, we’ll talk about eyeless fish, including how they look, what they do, and some types of eyeless fish. 

The Scientific Name for a Fish with No Eyes

Scientists call a fish with no eyes an “ophthalmic fish.” This word comes from the Greek “an,” which means “without,” and “ophthalmic,” which means “eye.” Anophthalmus fish don’t have eyes that work or have eyes that aren’t fully grown enough to help them see.

What is Blind Fish?

Blind fish are fish that have changed over time to be able to live in total darkness. They’ve lost their eyesight over time because they don’t need to see in the dark places they live. Blind fish live in many different places, like caves, underground rivers, and deep holes in the ocean. These fish have changed in many ways that help them find their way and eat when there is no light.

How Do Blind Fish Navigate?

Blind fish have learned to get around in their surroundings by using their other senses. These fish have outstanding powers of smell, taste, and touch, which help them find food and avoid hurdles.

The lateral line system is an integral part of how blind fish find their way around. The technique lets the fish feel movements in the water, which helps them find food and stay away from dangers.

Why Are Fish Without Eyes Important?

Certainly are, fish without eyes interesting to learn about, but they are also beneficial to science and the environment. They can tell us how eyes and other senses have changed over time and what it’s like to live in harsh conditions. Also, humans often risk or danger fish without eyes by doing things like polluting the water, destroying their habitats, or catching too many of them.

 By learning more about how they live and what they eat, we can better protect them.

Characteristics of Blind Fish

  • Lack of eyesight: Blind fish have no use for their sight in caves because it has been totally dark, which means they have evolved to have no eyes.
  • Enhanced other senses: Blind fish use their different abilities, like touch and sound, a lot to get around and find food since they can’t see.
  • Pale skin: Blind fish have pale or clear skin because the color isn’t essential in caves.
  • Slow metabolism: Because there isn’t always food in caves, blind fish have evolved to have a slower metabolism and can go for a long time without eating.
  • Elongated bodies: Blind fish have gotten longer and thinner, which helps them get through tight cave tunnels and find their way in total darkness.
  • Enhanced chemoreception: Blind fish have a better sense of chemoreception, which lets them find food by smelling toxins in the water.

What Are Some Examples of Fish Without Eyes?

There are fish without eyes all over the world, in rivers, seas, and both warm and cold places. Here are some fish that have no eyes:

●     Astyanax: The cavefish from Mexican has lost its vision and color, and its head and mouth have grown bigger so it can find food in the dark.

●     Typhlichthys: A cave-dwelling fish from the eastern part of the United States that doesn’t have eyes or color, but it can find its food by smell and touch.

●     Sinocyclocheilus: This cavefish from China has small eyes and a long, thin body that help it move through caves that are narrow and windy.

Blind Fish: Types and Examples 

There are many different kinds of blind fish, and each has its own unique traits and ways of getting around. Here are some of the best-known blind fish:

  • Mexican Tetra: The Blind Cave Fish, which is another name for the Mexican Tetra, lives in the rivers and caves of Mexico. This fish doesn’t have any eyes, so it has learned to live in the dark.
  • Electric Fish: The Amazon River Basin is home to electric fish that are able to live in dark water. These fish have learned to make an electric field that helps them find food and move around in their surroundings.
  • Deep-Sea Fish: Many types of marine fish can’t see because they live in total darkness at great depths. Because of where they live, these fish have skin that is sensitive to changes in pressure and movements in the water.

Fun facts About Fish Eyes

  • Some fish’s eyes can move separately from each other. So, they can look in two different places at the same time! This is especially helpful for fish that need to keep an eye out for enemies while also looking for food.
  • Many fish have good color vision and can see a wide range of colors, even ultraviolet light. This skill helps them find their way around and find their food.
  • Some fish have a layer in their eyes called the tapetum lucidum that reflects light. This helps them see in dim light. This layer bounces light back into the eye, which allows the fish to see better at night.
  • Fish can’t focus on things at different distances because the lens inside their eye doesn’t change shape like ours does. Instead, fish change their focus by moving their whole look forward or backward.
  • A nictitating membrane is a third eyelid that some fish, like sharks, have. While the fish is moving, this membrane protects the eye and keeps it moist.

Overall, fish eyes are exciting and have many unique features that help them live and grow in their watery surroundings.

Final Thought: What Do You Call a Fish With No Eyes?

 If a fish doesn’t have eyes, we just call it a fish. Even though the joke is funny, it is crucial to understand why this is happening. Fish can be born without eyes because of changes in their genes, and they have found their own ways to live in their surroundings. Fish without eyes can’t see, but they have other ways to find their way and stay alive. So, the next time someone asks, “What do you call a fish with no eyes?” you can say, “A fish!” with confidence.


Can fish survive without eyes?

Fish can live without eyes, yes. Fish that don’t have looks have other ways to sense their environment, like the lateral line system, which lets them feel movement in the water. Some fish without eyes have also grown a stronger sense of smell and taste to make up for not being able to see.

How do fish without eyes navigate in their environment?

Fish that don’t have eyes use their other abilities to find their way around. They use their lateral line system to feel movement and ripples in the water, which helps them figure out where they are. Some fish that don’t have eyes have also grown a stronger sense of smell and taste to help them find food and get around.

What are some other adaptations of fish without eyes?

Fish without eyes have changed in other ways to help them live in their surroundings, in addition to having better hearing, smell, and taste. Some blind fish have longer fins or bodies to help them move and keep their balance. Others, like cats, have grown organs on their heads, like barbels, that help them sense their environment and find food.

Are there any other animals that can live without eyes, like fish?

Yes, a lot of animals can live without eyes. Some salamander, snake, and bug species that live in caves are good examples. To make up for not being able to see, these animals have also developed other abilities, like being able to feel waves or changes in temperature.

Are fish without eyes common or rare?

Most fish depend highly on their eyesight to stay alive, so fish without eyes aren’t very common. But there are some fish, like the Mexican blind cavefish, that are known for not having eyes. Most of the time, these fish live in dark, deep places where they don’t need to see to survive.

Emma is the wordsmith behind the insightful articles and guides on our website. Her extensive research and passion for fishing shine through in every piece she creates. Whether sharing angling tips or delving into the latest conservation efforts, Emma is dedicated to providing valuable and engaging content.