1, superstition says that the fish in the well is a spiritual thing. In rural areas, it is said that every place has certain protection of gods, such as kitchen gods and bedside gods. And there are some protectors in the well. Fish protect the well, so you must not catch them easily.

However, the scientific explanation is that these fish were put in by the villagers themselves when they were digging wells. Later, when these fish grow up, we can often see them. The fish in the well can not only purify the water source, but also eat some bugs that fall into the well. In addition, it can also detect the quality of water. If one day some toxic substances suddenly fall into the water, these fish will be poisoned first, and then they will float up, which can also warn people around that there is something wrong with the water.

Extended data:

Well, mainly used for the construction of groundwater. It can be vertical, inclined or a combination of different directions, but it is mainly vertical. It can be used for drinking water, irrigation and hiding or storing things.

According to the buried distribution of groundwater and the lithologic structure of aquifer, human beings have created a variety of well types.

People in China have been using barrel wells for a long time. The diameter is mostly1~ 2m, and the depth is generally several meters to 20 ~ 30m. During construction, people can directly go down to the shaft to dig earth and stone. This kind of well is only suitable for exploiting shallow groundwater.

In order to exploit deep groundwater, tube wells with small diameter (several centimeters to tens of centimeters) and considerable depth (several tens to hundreds of meters) have been developed. Pipeline drilling requires special drilling machinery and complex technology. As early as 250 BC, in China's present Sichuan Province, a large number of wells tens of meters or even hundreds of meters deep were dug in hard rocks to exploit underground brine to cook salt. After drilling a well to expose the confined aquifer containing salt water, groundwater often flows out of the well itself. This kind of well is artesian well. China Sichuan Ziliujing (now Zigong City) got its name from this. In modern countries, tube wells are mainly used to mine groundwater, power rigs are used to drill wells, and various pumps are used as water lifting tools. Before China 1949, only a few cities had several tube wells, and few wells pumped water by electricity. By 1980, there were 2.2 million motor wells in China, which were widely used for water supply in industrial and mining towns and agricultural irrigation.

References:

Baidu encyclopedia entry? Baidu encyclopedia entry, huh