How is the betta fish vision?

In this post, we will answer the question “How is the betta fish vision?”. We will also discuss the main characteristics of betta fish vision sense.

How is the betta fish vision?

Betta fish, in general, do not have the same eyesight as predator birds, or, to put it another way, their eyesight is thought to be relatively weak, if not downright awful. 

So, you’ve probably noticed that your betta fish is highly active and lively during the day when there’s a lot of light, but not at all during the night when there’s no light. Betta fish are known to fall asleep in the darkness on a regular basis.

What is the clarity of betta fish vision? 

It’s worth noting that betta fish have monocular vision, which means that each eye may see something different, unlike humans, who have two eyes that work together to generate a single image. 

Possibly even more fascinating is the idea that betta fish have extremely limited depth awareness. This is strange because you’d expect that seeing two images at once would aid with depth perception, but it doesn’t. Betta fish have a difficult time detecting depth. 

Betta fish are supposed to have pressure sensors along their sides as a result of this. They are unable to perceive depth well enough, although they are able to detect pressure differences, which allows them to calculate how close they are to objects. As a result, betta fish have poor eyesight in general. 

So, you’ve probably noticed that your betta fish is highly active and lively during the day when there’s a lot of light, but not at all during the night when there’s no light. 

Is it possible for betta fish to see colours? 

Betta fish can perceive colour and can distinguish between different shades of red, green, and blue. The ability to feel and view items from both ways is provided by monocular vision, which they possess. Nonetheless, they cannot distinguish between colours in depth. 

Bettas can detect colours in the infrared band. The hues of the rainbow, as we all know, have various wavelengths of light. The wavelengths of green, blue, and violet are shorter. Red and orange, on the other hand, belong to the longer wavelength groupings. Bettas’ iris does not work quickly, so they are unable to react to changes in brightness in real-time. Overall, bettas’ eyesight is poor, resulting in inaccurate perception. 

The Crown and Veil tail betta fish have greater colour vision than the Comb and Double tail, Half-moon, and Delta kinds of betta. Colour awareness is limited in some other kinds. Furthermore, these species cannot distinguish between black and white. These betta varieties have developed cones that perceive distinct colour hues according to their environment. 

So, what colours are visible to betta fish? 

Bettas can see a wide range of colours due to their ability to detect distinct light wavelengths. Cones outnumber rods in their retina, allowing them to receive a clear focused vision of close objects and sense colours. Varying betta species, on the other hand, have different colour recognition abilities. 

The betta’s vision differs depending on their environment, therefore the same results may not be seen in a lake, river, or aquarium. Because they see colours using distinct light wavelengths, the density of clear and turbid water allows for varied refraction of light, altering wavelengths. 

Bettas can perceive and identify green, blue, and red hues in their natural habitat. Varying species, on the other hand, have different levels of perception. Colour vision is good in some varieties (Veil Tail, Crown Tail), but colour sensitivity is limited in others (Double Delta, Half-moon, and Comb Tail). These breeds have trouble distinguishing between black and white. 

Betta’s vision is mediated by four visual pigments that absorb various wavelengths of light, therefore colour perception changes depending on the pigments’ abilities. 

A transmembrane protein termed opsin and a chromophore make up each pigment. The opsin mutation permits UV rays to be absorbed. Bettas can perceive items that reflect ultraviolet light as a result of this. 

Is it true that betta fish prefer to be in the dark? 

Betta fish do not like being in the darkness, at least not while it is daylight; however, when it is nighttime, they are more tolerant of darkness.

We want it to be dark, just like we want it to be dark when we want to sleep. Some people install lights in their betta tanks to offer illumination at night, although this is unnecessary. 

These fish don’t mind being in the dark at night since it helps them sleep. The “sixth sense” that we covered earlier – the betta fish’s ability to detect pressure and adjacent objects – will also prevent them from swimming towards something when it’s nighttime.

Do betta fish see food items in the dark? 

No, a betta fish’s ability to see in the dark is severely limited. Depending on how much light is available, they may be able to see outline shapes, but this is debatable. Experts are confident that betta fish will not be able to see food in the dark due to their weak vision, particularly when it comes to night vision. 

Furthermore, even though they include pressure sensors to keep them from colliding with anything, it’s debatable if these sensors are sensitive enough to detect ultra-small morsels of fish food. 

Betta fish require light to hunt and see their prey, which is why they are never seen eating at night. 

How good are betta fish at seeing? 

Betta fish only have one eye. It can see in two directions at the same time as a result of this. Because their retina has more cones than rods, they can detect fine contrast and interpret images that are focused. 

Various investigations have shown that territorial fishes like betta have stronger colour awareness in low-light environments. 

It is the quantity of illumination they are subjected to that has an effect on their perception. Nonetheless, they are unable to perform in-depth colour research and may mistake red for a pink tint. Bettas have poor eyesight since they rely on their lateral lines and vibrations for vision guiding.


In this post, we answered the question “How is the betta fish vision?”. We also discussed the main characteristics of betta fish vision sense.

If you have any questions or concerns, please let us know in the comments section below!

Frequently Asked Questions (FAQs): How is the betta fish vision?

What does the eyesight of a betta fish look like? 

Bettas have an excellent short-range vision. They have excellent colour vision and a keen sense of shape. Bettas are equipped with a network of highly sensitive pressure sensors that run the length of their bodies. 

Why do fish eyes stand out so much?

Trauma is the leading cause of fish pop-eye. A fish gets scared or overly agitated and runs into something, causing the eye to be damaged. If the globe is not destroyed, swelling behind the eye can force it outwards, a disease called exophthalmia in medical terms. 

Is it possible to detect if a bett fish is dying?

Discolouration along the body of the betta fish, such as white or brown spots, are also indicators that the fish is soon to die. Severe swimming illnesses can also be identified by unusual movements or a shortening / eating away from the ends. 

Do bettas prefer to be in the light or do they dislike it? 

The use of excessive brightness can be irritating to them, but a simple aquarium light would suffice. Bettas are also fond of aquarium plants, which flourish under the proper lighting conditions.

Why does one of my fish’s eyes appear to be black? 

Paul Green elucidates. Black eyes are prevalent in calico fish, and you’ll almost always find one black and one normal eye. This is only a colouring of the eye surround, and it does not affect the fish’s vision.


Can Betta Fish See In The Dark?

Color Vision In Betta: Can Betta Fish See Color. 

Song, M. (2006). Caring for Betta Fish. 

What Do You Need For A Betta Fish? 8 Essentials –