How to see fish with Saiyang fish finder？

How are the fish tracks on the fish finder formed? 

Each sonar wave sent from the probe sensor will be converted into a frame of image signal after being received, and a set of pixels will be formed on the image, and the pixels will be connected to form a fish trajectory image.

The image displayed by the fish finder will be continuously updated in real time from right to left, and the scale on the right of the screen can determine the depth of the track (fish).

The length of the trajectory depends on the length of time the fish stays within the detection range. A short line indicates that the fish is swimming fast, while a long line indicates that the fish has stayed longer. According to the principle of sonar, the higher the density of the detected object, the greater the reflection feedback, that is to say, the thickness of the trajectory on the fish screen depends on the size of the fish. .

The trajectory pointed by the green arrow in this picture is a small school of fish. Next, look at the black arrow. We can see that there is a certain boundary between the black arrow and the bottom of the water, so it is easy to understand. This is a fish that sticks to the bottom. Many people may mistake the red arrow for a fish. Air bubbles (air bubbles are caused by rotting substances at the bottom of the water and are diagonal. Most of the air bubbles will have very straight trajectories due to their uniform rise.)