Is there a fishing mirror that can see the fish underwater?

First, you can look at the movement of the water. The movement here refers to bubbles. More technically, it can be called a fish star, that is, the bubbles that fish spit out when they eat underwater, or the bubbles that come out when they touch the mud at the bottom of the water. Of course, fish also form bubbles when they are afraid of running away.

Bubbles will change with the swimming of fish, and the size and quantity of bubbles produced by different fish sizes and different species are also different. If the water surface of a fishing spot is very calm and there is no response, it is enough to show that there are no fish or very few fish in this fishing spot. If there are blisters on the water surface of the fishing spot, it can be judged that there are fish in this water area.

Under normal circumstances, the bubbles produced by crucian carp are small and few, and the size is basically the same, similar to that of small mung beans. Under normal circumstances, they are all produced separately, slowly floating, and the position will not be fixed. The bubbles produced by carp are very dense, all large and small, which basically appear in groups on the water surface, and sometimes mud and debris move slowly with them. Grass carp, on the other hand, produces large bubbles, which are formed in strings. The large bubbles are mixed with small bubbles, and occasionally a single bubble or a pair of bubbles appear.