Qiandao Lake is known as "the most beautiful water in the world" among the major rivers and lakes in my country. It is actually difficult to get this reputation. In addition, for Qiandao Lake, a tourist attraction, the water quality of the lake area is good or bad. , related to whether the tourism industry is prosperous, next I will tell you about the "two major difficulties" of Qiandao Lake. Many years ago, some people realized the importance of "using water to raise fish and using fish to protect water" and began to Increase the investment of old fish species such as silver carp and bighead carp. What will these "water-retaining fish" save? Some researchers told us that silver carp and bighead carp rely on filter-feeding plankton in the water to grow. Some data show that these fish need to consume 40 kilograms of plankton for every kilogram of body weight they grow.

This means that they can effectively reduce the nitrogen and phosphorus content in the water, which is quite impressive, isn’t it? Therefore they are known as the "cleaners" of water bodies. Some experts and scholars also agree that stocking a certain number of silver carp and anchovy in Qiandao Lake can inhibit the growth of blue-green algae; people only need to ensure a fixed fish output and reasonable fishing. We are very satisfied with this result. You will notice that existing studies have well proved that if the number of silver carp and bighead carp in the water body is lower than a certain level, they will not be able to contain the "album bloom" that grows wantonly. Remember in 1998 There have been relatively serious "algae bloom" events in certain areas of Qiandao Lake, which also shows that the number of silver carp and bighead carp stocked in the lake at that time was obviously insufficient.

In fact, the relevant survey results are very complicated. For example, silver carp and bighead carp cannot reproduce naturally in Qiandao Lake, so people need to continuously replenish a certain number of silver carp and bighead carp species to Qiandao Lake to ensure that The reserves of organic silver carp and bighead carp in Qiandao Lake. Is there some way we can do this better? For this reason, based on some data, people implemented a quota fishing system. In order not to cause damage to this type of fish during fishing, this new weapon appeared, that is, a sinking and floating live water fishing vessel. Through its special inlet and drainage structure, the net is raised After the fish can swim directly into the cabin, any change is not achieved overnight. These have been repeatedly pondered and tested, and finally a different operating method from traditional fisheries has been obtained, and the transformation has been refined. In the transportation of live fish, the relevant companies can be said to have paid a lot of "tuition fees."

An old employee in charge of distribution explained that in the era when the highway network was not yet established, the first big problem encountered was that once the fish truck broke down halfway, a new fish truck would need to be replaced. Rushing to pick up and replace, which means that every once in a while, transport personnel need to pay attention to water quality, water temperature, oxygen content, PH value, etc. Everything done at that time will make people feel happy and relieved today. I still remember that in 1959, Chun'an County built my country's first self-designed and built Xin'an River Reservoir. At that time, about 300,000 people chose to leave their hometowns. Since then, , people saw that 300,000 acres of fertile land turned into a lake of beautiful water, which is the vast Qiandao Lake. Its total water storage capacity is almost the size of 3,000 West Lakes, so Guo Moruo praised it as "Three Thousand West Lakes".

Nowadays, Qiandao Lake in Zhejiang is famous all over the world for its water and missed by the world for its fish. Chun'an, an "ecological and cultural county" in western Zhejiang, is also famous for this. We are quite lucky because the Qiandao Lake area has 114 species of fish and a fishery resource reserve of 150,000 tons; the water body of Qiandao Lake also maintains the national Class I water quality standard all year round.

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