Why did fish slowly appear in the big puddle where there were no fish at first?

In fact, these fish may be the fish in the pond itself. There is usually mud around the pond, so as long as there have been fish in this place before, there may be fish eggs hidden in this mud. There is an old saying in ancient China, which is called Millennium grass seeds and Millennium fish eggs. Because fish eggs are covered with a protective film, they can be protected from the interference of external environment and the harm of natural enemies.

So they can survive for a long time even in the soil, so the vitality of fish eggs is very tenacious. When the fish eggs in the soil meet the water and the temperature, humidity and other conditions are suitable, the fish eggs will naturally hatch and become fish.

Of course, some fish have great vitality. When the water is about to dry up, they will dig holes in the soil, and when the water is enough, these fish will come out of the soil again. It's just in our inherent impression that there are no fish in this place, so it seems that these fish appear out of thin air, but in fact they have existed here for a long time.

The other situation is very similar to the way many plants live and sow in nature. As we all know, the seeds of plants can be spread by natural forces, such as wind, bees and butterflies. But in fact, not only plants, but also some fish can spread fertilized eggs into small ponds in these ways. For example, some waterfowl act as a medium for the spread of fish eggs.

When fish eggs are scattered in small ponds, with suitable hatching conditions, these fish eggs will hatch into small fish and survive tenaciously in these ponds.

After the hatched fish naturally reproduce, the population will naturally become larger and larger, and with the addition of fish, the fish manure it produces is a nutrient-rich fertilizer, which makes many green plants, such as algae, grow rapidly and can quickly catalyze the formation of pond ecosystem. So in some small ponds, the number of fish will explode, which is completely the magical effect of nature.

Of course, the small ponds or pools mentioned above are all formed without human interference. In addition, there is a common situation in our daily life, that is, the pond is dug manually.

Some places need to dig pits to store water. The water extracted from these pits can't be tap water, but river water extracted from other places, so there may be aquatic plants and microorganisms in these waters, and fish eggs may be mixed in them, which greatly increases the possibility of fish entering the pond.

Therefore, under the right conditions, these fish eggs will hatch, so in some cases, even if there are no fry in the pond, fish can be found in the pond after a while.

So in any case, the fish in the pond certainly didn't appear out of thin air. No matter how you get into the pond, you start with fish eggs and then hatch into fish, but this process and method are different.

Therefore, some incomprehensible things we encounter in our daily life can often be explained by scientific reasons. As long as we observe and explore carefully, we can discover the mystery.