When it comes to fish in the natural waters of the continent, it can be said that there are countless textbooks. The waters are vast and there is a great variety of fish. According to some data, there are 1050 species of fish in the country, including 967 species of freshwater fish!
Although there are so many fish species, there are only a few species that are really close to life. For example, four big fish, carp, crucian carp, bream, etc., they can be said to be one of the main ingredients in the daily table!
As a delicious ingredient, the appearance rate of grass carp is in the south or the north, and the circulation of the market can definitely be said to be among the best.
Grass carp this kind of fish, not only delicious meat, few fine thorns, but also cheap, coupled with its mud pond culture, or reservoir culture. It is not like carp, silver carp and other fish have a very heavy muddy smell, so it is loved by ordinary families and restaurants in daily life. Nowadays, in addition to blackfish, sauerkraut fish is the main ingredient used in various places.
Due to the high degree of market acceptance, it has also caused considerable market demand. Grass carp has also once become the main breeding target of farmers around the world, and grass carp not only grows fast, the individual is large, and the breeding is simple and the cost is low.
The annual production of grass carp on the mainland is as high as 5.5 million tons, almost the sum of crucian carp (2.7 million tons) and carp (2.9 million tons).
Such a large production, coupled with the super high reproductive capacity of grass carp, but in the wild waters, it is very few, why?
草鱼的繁殖能力有多强，为何野外很稀少？
Grass carp has a strong reproductive ability, and compared to many freshwater fish, its reproductive ability is also quite outstanding. Adult female grass carp can lay up to 1.3 million eggs at a time.
However, the ultra-high spawning capacity can not stand its extremely low hatching of fish eggs, in natural waters, grass carp eggs hatching ratio of 10%, and in captivity, its success rate can be as high as 80%.
This is based on the spawning rate of grass carp and its survival rate in the wild. Grass carp in the wild, that should have a considerable number of presence. Why, in addition to large waters, there are so few grass carp in the wild today?
In fact, this problem is very easy to understand, to borrow a phrase: "God has closed a door for you, and he will surely open a window for you." This sentence is not wrong at all to say that grass carp, in natural waters, grass carp breeding, hatching conditions are quite harsh.
Usually, the sexual maturity of grass carp is 4 years old, but even if it is earlier, it takes 3 years old, and the individual only reaches more than 10 pounds. Not only that, the breeding period of grass carp is from April to May every year, and breeding also requires a certain flow rate of water impact.
In addition, the hatching conditions of grass carp's eggs are also very high, and the water temperature that is most suitable for grass carp breeding and hatching is usually 18 to 20 degrees, and it needs to be maintained for several days.
Under the blessing of such restrictions, how high can the number of grass carp in the wild go?
Moreover, there are many kinds of obstacles that affect the natural reproduction of grass carp!
Even today's large reservoirs, lakes, grass carp retention, unless they are stocked and stocked, may really become extinct.
Due to climate change, the amount of rainfall becomes unstable, which also causes large waters in many places, and during its breeding and mating, the source water flow rate is not enough, which affects its spawning ability.
Then there is the human factor that makes it rare!
With the continuous progress and development of society, the interception and damming of many major rivers has invisibly changed the flow rate of water. This has led to a very low speed of large rivers and rivers, and has also caused indelible damage to the reproduction of grass carp!
Finally, the reason for the scarcity of grass carp is overfishing!
Although the market circulation price of grass carp is not very high, it is large, and an adult grass carp can usually grow about 30 to 40 kilograms. From hatching to growth, grass carp can grow to about 1 kilogram at 1 winter age and more than 7 kilograms at 4 years old.
Therefore, under the accumulation of weight, the interest value of grass carp is also reflected. At the same time, grass carp belongs to the social fish. Once a school of fish is found, it is almost possible to catch a considerable harvest in today's trawling.
Therefore, the rarity of grass carp in the wild is also reasonable!
番外篇，草鱼最大能长到多大？
Under normal circumstances, grass carp generally have a lifespan of 7 to 8 years, and the maximum weight of grass is about 40 kilograms. However, in natural waters, many limits can be broken, and if conditions permit, a grass carp may live a long life.
At present, a recorded high-life grass carp is in Ziwu Village, Xiuning County, where villagers have raised a grass carp that has lived for 49 years in a fish pond, weighing 35 kilograms. Because, there is a local custom that after a child is born in the family, you have to put a few fry to let the fish grow up with the child. Eventually, the child was 49 years old, and the fish grew up with him for 49 years.
However, if the grass carp had survived in natural waters for 49 years, it would have definitely been greater than 35 kg individually. Because, the fish pond is too small, and it is a mountain spring. And only by feeding growth, to a large extent limit the growth of grass carp.
However, so far, the largest grass carp found should be at a site in the Three Gorges. Archaeologists have unearthed the vertebrae of a female grass carp, with a bone length of 54 centimeters, which has been speculated by experts. The grass carp is more than 2 meters long.
However, this grass carp lived more than 3,000 years ago in the Shang Dynasty, when the Three Gorges region was sparsely staffed and received relatively little interference. To grow so big makes sense.
总结
As an economic fish in the mainland, although the market circulation is large, the number of grass carp that really grows in natural waters can indeed be said to be quite rare. And the amount of grass carp is huge, a grass carp needs to eat 90 pounds of aquatic grass for every pound of growth, so if the number is too large, it is easier to limit its racial reproduction. This is also the law of survival of nature, natural selection.
Finally, tell me how big the grass carp you've ever seen is, and leave a comment in the comments section!
I am yes feng, like the likes, attention, thank you for reading!!!