Why do fish appear in newly dug ponds soon, and how did they come here?
"Grass seeds of thousands of years, fish eggs of ten thousand years" should be easier to understand. Grass seeds and fish eggs are full of strong vitality. Fish eggs can survive for a long time even in immature conditions. Once there is a suitable water source and other conditions suitable for growth, there will be small fish. Even if there is no water source around and no fish fry to provide, small fish can be seen in small ditch and creek fish ponds with water soon. Common fish include crucian carp, loach, eel and other tenacious fish. In rural areas, you can often see a hole dug in the ground. As long as there is water all year round, there will be fish.
fish eggs
- The incubation conditions of fish eggs =========================================
> > Generally, it takes 3-7 days from the laying of fish eggs to the hatching of small fish. If the average water temperature is 15-20°C, the hatching days will be 5-7 days; when the average water temperature is 20°C, it will take 4-5 days. Hatch small fish; when the average water temperature is 20-25°C, it only takes 2-3 days. In short, the lower the water temperature, the longer the incubation time. >
Aquatic small fish
The most important thing is to have water, and the water temperature can meet the hatching conditions of fish eggs as the temperature rises. Fish eggs that have been dusty for thousands of years (a bit exaggerated) can gain new life.
- The transmission route of fish eggs. Why are there fish in the wasteland with no water source and no fry soon? =================================================================================================================
(1) Wind and rain transmission
Some fish eggs are settled to the bottom of the water. The wind blows the fish eggs attached to the soil on the dried-up pond bottom, and the fish eggs attached to the soil float with the wind. Under the washing of rainwater, they can easily float to the next water source.
small fish
(2) Communication of humans and animals and machines
In rural areas, cattle, as herbivores, often forage in wastelands and other grass-rich places. They can spread nearby fish eggs to the newly opened ponds, and they will flow into the ponds after being washed by rainwater. egg. The work of humans and machines can also spread. Fish-eating birds are also a relatively common mode of transmission.
- The wasteland itself has many conditions, "everything is ready, only the water source" =========================================================================================
The hatching of fish eggs requires a suitable temperature and water source, but the growth and development of small fish requires more nutrients. The wasteland contains raw materials such as weeds and rotten grass leaves. These litters provide microorganisms and are conducive to the growth of aquatic plants. Like crucian carp, loach, eel, etc., all grow and develop on spoiled microorganisms. As long as there is water, a new green cycle of the ecological circle will be formed.
Ornamental fish
This is why there will be no fish on a barren hill without vegetation, or building a pool (unless moss grows)? Without bait and food, even if they successfully hatch, it is difficult to survive.
In the countryside, there are small pits or ponds with weeds on the wasteland. As long as there is a water source for a long time, there will be small fish.