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[Parenting] How do fish recognize the environment

Photo Source: Wikimedia

The fish use sidelines to sense the flow of water depending on the prey, kin, and predator movement.

The sideline is a mechanical sensation arranged on both sides of the fish, from head to tail, to sense objects or other creatures, or to sense changes in water flow.

The fish use the very small sensory organs in the sideline to find the exact path. However, as the flow rate of water increases, the noise also increases.

The scientists at the university first created a three-dimensional model that resembled a real fish, and correctly implemented the conditions under which the actual water flowed.

The measured values ​​in the experimental environment using this showed that the specific anatomic adaptation of the fish minimizes the noise. The results of these experiments were published in the Journal of the Royal Society Interface.

Butler is a fish that lives in the river below a slow river. As with most fish, the willidle uses a sideline to sense the flow of water.

The mechanical sensory receptors of this organ are evenly distributed throughout the surface of the body, and this is why fish can build a three-dimensional hydrodynamic image of water. Fish use these features to find ways in the dark and identify prey, kin, or predators.

Host Vleckman, a recently retired zoology professor at the University, spent several years researching fish sidewalks and made use of the findings.

The field of application is the first realistic three-dimensional computer model that conceived of the idea of ​​a sensor that technically identifies the flow of fluid to be used to identify the leaking parts of the pipe.

Dr. Hendrik Herzog and Dr. Alexander Ziegler, two scientists, have taken the research of fish sideline to a new level.

They built a realistic 3D computer model of the fish sideline for the first time and used them to precisely analyze the state of the flow around the sensor.

Dr. Herzog said that the head of Butlerch was a very complicated form of sideways sensory organs, so he put a great deal of effort into studying the sideline of the head of the buttress.

There are two kinds of sensory organs on the fish sideline, some of which protrude from the skin, like a small lump. The rest of the sensory organs are located at the recesses along the hair bones, and they come into contact with water flowing outside the body of the fish with small pores.

When food such as freshwater shrimp is near a fish, nearby water flow and water pressure change, and fish senses it through numerous sensory organs in the sideline. However, there has been no clear-cut study of the actual functioning of the sidewall that senses this different flow.

The three - dimensional model developed by Dr. Drew was supported by the Department of Applied Science at the University of Westphalia.

Klein compared various methods of 3D restructuring in his academic paper on zoology.

He made a 3D model of the picture of the willow with 350 pictures left over from the various angles of his head. The sensory organs of the sensory organs or sideways were marked in different colors to clearly show their structure.

Klein then optimized the data set by digitizing the buttress using a much higher resolution laser scanning procedure.

In this way, the actual appearance of the buttocks could be created, but the inside of the buttocks was constructed in a different way.

The subcutaneous structure of the buttocks could be constructed by micro CT technique. Using these methods together, a realistic 3D model could be created.

Using this same realistic model, various conditions of water flow could be constructed on the simulation and the hydrodynamic signals detected by various sensors could be calculated.

As the flow rate of water increases, the noise signal on the sideline of the fish also increases. Despite these conditions, the fish correctly perceived the environment even at rapid flow rates, which was revealed by numerical calculations using a three-dimensional model, because the flow rate in the sensory organs such as convex hump over the skin was considerably slowed down.

For this reason, he says, even if the fish is in the fast flowing water, signals from environmental factors such as food, rather than noise, are perceived more in the sensory organs.

Sensory organs located in the groove along the head bone differ in the velocity at which each sensory organ can sense the most sensitively because the diameter of the grooves in which the sensory organs are located are different from each other.

Application of this can greatly improve the ability to find the path of underwater robot.

"Using this systematic approach will enable comparative anatomical studies of different species of fish at a very high level in the future," said Dr. Ziegler.

Dr. Herzog said that using the application techniques inspired by the senses of the Butlerchi, it is possible that underwater robots could use their flow sensors to improve their ability to navigate in the water themselves to a fairly high level.

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