Young zebra fish 360 degree four-color vision: there are different color sensations on objects

On June 26th, Beijing time, according to foreign media reports, human beings have the eyes facing front and can rotate. Imagine, if human beings can’t go on the history of the evolution, swing in the head, what is the difference between the world in our eyes? Zebrafish’s young fish is a model organism that is often used in scientific research. It has a visual system that is completely different from us, which may help us answer this question.


Zebra fish eyes


Visual diagram of young zebrafish. In terms of young zebrafish eyes, some of the objects of the object can be seen mainly to see three colors, and the part of the object is observed, it mainly sees black and white and ultraviolet light.


Adult zebra fish

In a paper in the “Current Biology” magazine, the author wrote: “We show this asymmetry observation that zebrafish uses anisotropic retina to natural vision world.” In their 360 degree four-color vision, it looks very different.

So how do they do? The researchers conducted a survey of 31 shallowful zebrafish habitats in the coast of India, West Bengal, India, and photographed pictures to determine the scenes of the zebrafish jungle eye. According to research data, scientists put forward 3 fakes: the upper half of the zebrafish eye saw less colors; zebra fish can see their prey in ultraviolet light; and zebra fish can see 4 species in front and below Color (add ultraviolet light on the basal of red, green, and blue.).

Tetrachromacy refers to the organisms with four separate photosensitive channels, or four cone cells that have four perceived colors (tapered cells perceived than humans). Most birds have four color visuals.

Researchers returned to the laboratory and began to verify these hypothesis. They cultivated gene-modified zebrafish, making fluorescence when the light receiver in the fish eyes can observe the light of the corresponding color. Then, the research team fixes the fish and injects a chemical that makes their eyes unable to move, and then use different colors of light to measure the eye of the photoreceptor.

The results show that the researchers seem to be right. “We have proven that the inner view of the inner and zebrafish is very matched with their natural visual environments at multiple levels,” researchers wrote in the paper. In terms of young zebrafish eyes, the part of the above objects can be seen mainly to see three colors to increase the ultraviolet light, while the part of the above objects mainly see black and ultraviolet light.

The researchers pointed out that there are many problems need to be solved, such as how to use these visual information, and whether the behavior is more complex, has similar visual visual. In addition, the paper also pointed out that they can’t directly measure green sensors, and must use methods to react to other color reactions. Mathematical calculations.

Of course, we are not zebra fish, so we can’t really understand what the world is in the eyes. However, from the layout of the light receptor in the eyes, what they see is obviously different from us.

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