Dig a lake on the ground, after many years, will there be fish in it?

If this birth refers to the "creation of nothing" from inorganic matter to organic matter, and then the evolution of life into fish, this situation is almost impossible no matter how young; there may be fish roe in the bottom mud of this lake, which will disappear after being injected into the water. Fish appeared. There are also fish roe in the injected lake water or the accumulation of rainwater, and fish will appear after two or three years. Even if it is guaranteed that there are no fish roe in the water and the bottom of the lake is sealed with cement, water birds or some other animals that come to the lake are likely to bring fish roe.

Evolution by natural selection only adapts a population to the current environment and cannot predict future environments or needs. Therefore, a trait may be selected in a certain generation and eliminated in the next generation after the environment changes. As shown in the figure below, the high energy cost makes some fish with reduced or even lost eyesight have a survival advantage and are selected by the natural environment. Therefore, evolution simply responds to current environmental conditions. Fish There is another way fish migrate: with the help of birds, mammals and amphibians. Birds, amphibians, and various aquatic mammals often attach fish eggs to limbs or wings as they swim from one lake to another, and these eggs may be dropped when they stop in another pond, thereby Thrive in new ponds, thereby acting as hosts for dispersal of fish eggs between two ponds, or fish may drop when birds hunt for food, etc.

A few years in dry conditions is pretty impressive for fish roe, but fish roe can survive anhydrous conditions and be blown by the wind. So in theory, as long as there is wind blowing, it is possible for small fish to appear without artificial stocking. Therefore, if a lake is dug, it does not need countless years, and there may be fish in just a few years.