Recently, a giant blue fish came out of the water in the Fuchun River Reservoir, with a large body and a black body, which attracted people to watch and take pictures. According to measurements, the weight of this bluefish has reached 200 pounds, and it is estimated that it is decades old, which can be called "Fuchun River Bluefish King"!
As early as the 1980s, the Fuchun River Reservoir became a local key business object, artificially releasing a large number of fish fry, and it is not unusual to breed more than 100 kilograms of large fish. Among the wild fish caught locally, blue carp, grass carp, silver carp and carp have the highest appearance rate, accounting for about 80% of the total production, and these fish can grow to more than 100 pounds.
Like the Xin'an River, the Fuchun River is also rooted in the Qiantang River. As the largest river in Zhejiang Province, the Qiantang River has a total length of more than 500 kilometers, and is also known as Zhejiang, Luocha River and Zhijiang River. Since the completion of the Xin'anjiang Reservoir and the Fuchun River Reservoir, the natural courses of the Qiantang River have been divided into three sections: the upper, middle and lower sections, corresponding to the Xin'an River, the Fuchun River and the estuary section of the Qiantang River, respectively, and the fishery resources and hydrological characteristics of each section are different.
Among them, the Fuchun River Reservoir was stored in 1968, and has been stored for 53 years, with abundant water and abundant fishery resources, and is a natural spawning ground for settled fish.
<h1 class="pgc-h-arrow-right" data-track="88" > so what is the reason for the big fish in the Fuchun River? </h1>
The first is the diversity of the environment and the abundance of fish species.
Before the construction of the Fuchun River Reservoir, the river was turbulent, the river valley was deep, and the rapids were rushing, which was not conducive to fish retention. Since the dam intercepted and the reservoir has been stored, the upstream water level has slowly increased, the flow rate has slowed down, and the water potential has been stable. A large area of slow water is formed in front of the dam, and the upstream area farther from the dam is a river with a faster flow.
The hydrological characteristics of the Fuchun River Reservoir are between rivers and lakes, and the complex environment provides a habitat for a variety of fish, and both river and lake type fish can reproduce naturally (except migratory fish).
The second is sufficient bait and high productivity.
Since the 1980s, the Fuchun River Reservoir has been an important fishing source. For example, in 1987, the reservoir produced a total of 553 tons of fresh fish throughout the year, although there is still a big gap compared with the more than 3900 tons of Xin'anjiang Reservoir, but aside from the reservoir area to see the yield per mu, the FuchunJiang Reservoir is better.
According to the historical catch, the Fuchun River Reservoir can produce an average of 8 to 13 kg of fish per mu of water surface, while in the same period, the Xin'an River Reservoir only produced about 6 kg of fish per mu of water surface, and the highest in 1986 was only 8.38 kg (see table below). The main reason is the difference in the richness of the bait.
After the formation of the reservoir, the biological bait in the reservoir area was multiplied in large quantities, and aquatic microtubules such as bitter grass, Malay eye vegetable, polygrass, and Manjianghong flourished unprecedentedly, and benthic animals such as ring snails also began to increase. According to monitoring, the biomass per square meter of the section in the Fuchun River reservoir area is 52 to 575 grams, and the highest even reaches 2500 grams, and the biomass is much higher than that of the Xin'anjiang reservoir area, providing a sufficient food source for fish.
Finally, there is the help of artificial release.
Since the 1980s, the stocking activities of the Fuchun River have never stopped, and in recent years, the stocking species have been mainly silver carp, bighead carp and yellowtail catfish. Local regulations: within 15 days of stocking, the use of dense net fishing is strictly prohibited in the section of the river 2 kilometers above and below the release point. For phenomena such as electric poison explosions and stealing sewage, the punishment methods are more severe, which effectively protects the ecology of the Fuchun River and enriches the fishery resources.
<h1 class="pgc-h-arrow-right" data-track="85" > fry stocking for 50 years, how big is the largest fish in the Fuchun River? </h1>
According to the data, the history of fry stocking in the Fuchun River has been 50 years, and considering the perennial fry stocking and the huge fish base, there are certainly not a few big fish in the reservoir area. Some netizens are also curious, how big is the biggest fish in the Fuchun River?
To understand this problem, we must first know what large fish are in the Fuchun River.
We all know that the largest existing freshwater fish in the country is the Chinese sturgeon, the common individual is 0.4 to 1.3 meters, weighing 100 to 600 pounds, and the adult Chinese sturgeon can grow up to 5 meters and weigh up to 1200 pounds, which is a veritable freshwater fish "Fish King". If there is really a Chinese sturgeon in the Qiantang River, then the 200-kilogram giant bluefish may have to "stand aside".
Surveys in recent years have shown that wild Chinese sturgeon are mainly distributed in the Yangtze and Pearl River basins. However, according to historical records, the distribution range of chinese sturgeon was once very extensive, distributed in the Liao River, Yalu River, Yellow River, Qiantang River, Minjiang River and other river systems, and foreign countries in the west of Japan's Kyushu, Korea's HanJiang estuary and Lijiang are also distributed.
Chinese sturgeon in the Hangzhou area is extremely rare, and there was a collection in the Zhejiang Museum of Natural History, but the sample size is not large. In June 2020, a suspected Chinese sturgeon was found on the bank of the Qiantang River, and for the identity of this sturgeon, some people said that it was Chinese sturgeon, and some people said that it was an artificially farmed hybrid sturgeon.
Considering the barrier of hydropower dams, it is unlikely that chinese sturgeon will migrate to the Fuchun River section, and the probability is almost zero. Even if an adult Chinese sturgeon goes astray and accidentally migrates to the Qiantang River basin, it can only stay in the estuary section and cannot be blocked by the dam. Are there any artificially released hybrid sturgeon? This is more likely, but it is also impossible to reproduce naturally, and it is difficult to become a climate in the end.
As a result, the largest fish king in the Fuchun River section can only be produced from conventional fish species, such as four large fish, carp and even catfish. As long as the growth time is long enough and the bait is sufficient, these species have the potential to become "rice big fish", and the maximum weight varies.
Bluefish, also known as snail green, black mix, the largest domestic bluefish specimen weighs 218 pounds, body length of 1.86 meters, in 2005 out of the water in Nanjing Jinniu Lake, fish age of more than 40 years old. In the Fuyang River section, snails are the dominant species of benthic animals, rich in shellfish resources, with reserves of up to tens of thousands of tons, fully capable of feeding larger bluefish. Conservative estimates, there should be a lot of 100 to 200 pounds of bluefish in the reservoir.
Large grass carp can also grow to more than 1 meter and weigh more than 50 pounds. According to Wikipedia, grass carp are commonly 60 to 100 centimeters long, the largest can grow to 2 meters, and the weight can reach 90 pounds.
Silver carp and bighead carp are very popular water-retaining fish and water-purifying fish in China, and their habits are similar. The typical length of silver carp is 60 to 100 cm, and the maximum can grow to 140 cm, corresponding to a weight of 100 kg. Bighead carp can also exceed 100 cm in size and weigh 80 to 100 pounds.
Fuchun River Baotou fish
Judging from the capture cases of the Fuchun River, the 37-kilogram Baotou fish (bighead carp), the 63-kilogram catfish, and the 31-kilogram Shi's sturgeon (a species that escape from artificial breeding) have all appeared, and every time a large fish comes out of the water, it can cause a sensation, but it is still relatively rare to break through 100 kilograms of large fish.
Of course, artificial fishing cannot catch all the big fish, and we can only reasonably speculate based on existing cases. If you want to ask how big the largest fish in the river is, it is estimated that no one can give an accurate number, but 200 pounds of bottoming should not be a problem.
<h1 class="pgc-h-arrow-right" data-track="86" > the threat of the "fish depot" of the Fuchun River</h1>
The fishery resources of the Fuchun River are indeed a precious asset, but it is difficult to protect this "fish reservoir". In recent years, there have been at least two factors threatening the fishery resources of the Fuchun River:
First, fishing pressure is relatively high, and quota fishing is imperative.
From March 1, 2021, the Fuchun River began to implement a four-month fishing ban period every year, and from March 1 to June 30, all fishing boats docked, and all productive fishing was strictly prohibited. However, compared with the ten-year fishing ban on the Yangtze River, the fishing ban in the Fuchun River is negligible and needs to be strengthened.
According to other data, fishermen driving motorized fishing boats basically enjoy diesel subsidies, and some subsidies account for about 70% of the fishing costs, and have even become an important source of economic income for fishermen. In Nanxi District, each ship subsidizes 3,000 yuan per year for diesel, Jiande 7,500 yuan per ship, Tonglu District 3,000 yuan per ship, and Fuyang District 5,000 yuan per ship.
Diesel subsidies have partly spurred fishermen to buy more motorized fishing boats, which could increase fishing pressure. After all, the effect of the 4-month fishing ban is limited, and if fishing is intensified, fishery resources are likely to "make ends meet". The best course of action is to limit the harvest of fishing, allocate a certain amount of catch per fishing vessel, and stop fishing when it is full, so as to solve the problem of increased fishing pressure.
Second, increase the supervision and punishment of wastewater discharge, and control pollution from the source.
Since 2000, the water quality of the Fuchun River has shown a deteriorating trend, and water quality fertilizer and nitrogen and phosphorus pollution have become a major problem. In 2004, 2016 and 2017, large-scale cyanobacterial blooms broke out in the Fuchun River Reservoir, and the water surface was smelly and the harm should not be underestimated. The reason for this is that the nitrogen and phosphorus emissions in the upper reaches of the reservoir area are hard to blame. Only by blocking the source of pollution from the source, supplemented by "silver carp water purification", can it be expected to reverse the trend of deterioration of water quality.
In short, "green water and green mountains are golden mountains and silver mountains", whether it is pollution or overfishing, it needs to be taken seriously, strengthen control and control, and scientifically retain water. Only in this way can the ecological environment of the Fuchun River get better and better, and the fish resources can be more and more!