As the temperature gets higher and higher, summer arrives, but the first thing that comes is not the high temperature, but the mosquitoes! Even in the north, when the temperature is not high in April, mosquitoes have quietly arrived, and the number of mosquitoes has increased so far. I believe that not many people like mosquitoes, because in addition to sucking blood, mosquitoes are itchy and painful in the places where they are sucked.
This is because mosquitoes will contain anticoagulants, digestive enzymes, formic acid and a variety of unknown proteins of saliva to inject into the human body, anticoagulants can prevent blood clotting and vasoconstriction, after a full meal, dash away, and then the stung skin due to allergies, thus forming a bag. Different human bodies form different packages, some people are not allergic and therefore have no reaction to mosquito bites, some people are particularly allergic and can form a large package.
No one is not sucked by mosquitoes in the summer!
Whenever the summer how to prevent mosquitoes has become a compulsory course, there are many ways to prevent mosquitoes. Some people use mosquito nets to isolate mosquitoes and make them unable to enter; some people use mosquito coils to kill mosquitoes through the insect repellent odor emitted by the burning of mosquito coils to keep mosquitoes away, or to kill mosquitoes. However, these methods have limitations, although they can achieve the effect of killing mosquitoes, but they cannot reduce the breeding of mosquitoes from the root.
So is there a way to fundamentally solve the breeding of mosquitoes, thereby reducing the number of mosquitoes and achieving a once-and-for-all effect? It can be clearly said: "There is", and China has been introduced for 109 years, it is "mosquito-eating fish". Listening to the name, it is a fish that feeds on mosquitoes. But although the mosquito-eating fish can reduce the breeding of mosquitoes, people have a lot of controversy about it, some people say that its "angel descends", some people say that it is "the devil crawls out of hell", why is there such a big contrast? It all starts with its origins.
Mosquito-eating fish came into being
<h1 class= "pgc-h-arrow-right" > in order to kill mosquitoes, mosquito-eating fish came</h1>
This fish is native to the Guadalupe River in Texas, USA. Introduced to China (Taiwan) in 1911 to eliminate mosquito larvae, due to the suitable climate, mosquito-eating fish grow in Large quantities in Taiwan, and spread throughout Taiwan for a short time.
Suitable for the growth temperature of mosquito-eating fish is very wide, because it can survive in the water temperature of 0-40 °, the most suitable water temperature is 18-30 °, strong adaptability, can survive in sewage or acid and alkali water with a certain concentration. Survive in rivers, reservoirs, ponds, canals and even stinky puddles downstairs. The main food is aquatic insects, branches, copepods, and the larvae of mosquitoes (jié jué), etc., and the mosquito-eating nature makes it very popular.
In 1924, the Philippine Institute of Medical Sciences donated a batch of mosquito-eating fish to Shanghai for trial breeding, and two years later, a batch of mosquito-eating fish was shipped from the U.S. Department of Fisheries. Through long-term domestication and breeding, mosquito-eating fish have multiplied in large quantities in rivers and ponds on the outskirts of Shanghai. At the end of the 1950s, it began to be released in many cities in the north and south of China, and in the 1960s, it was bred in the Guangzhou area.
The appearance of mosquito-eating fish
The mosquito-eating fish is not a native fish in our country, but an "outsider", which has been introduced due to its ability to eat mosquitoes. In fact, there are many countries that have introduced mosquito-eating fish, and they have now invaded most of the world. Only a few countries and regions and the introduction of mosquito-eating fish are the net land for mosquito-eating fish.
< h1 class="pgc-h-arrow-right" > why mosquito-eating fish are called "angels"? </h1>
Then there are 2 main reasons why mosquito-eating fish are called "angels", first of all, to control the number of mosquitoes from the source. Mosquito larvae for the widow (jié jué), mosquitoes in the water to lay eggs, can lay eggs 6-8 times in a lifetime, each time laying 200-300 eggs, eggs after 3 days of hatching called larvae, larva after 5-7 days of growth, mature into pupae, chrysalis cocoon into butterflies after becoming adults, from here it is not difficult to see that the mosquito larvae in the water to complete hatching, growth, and metamorphosis.
Mosquito larvae survive in the water and are abundant, and the larvae of these mosquitoes become food for mosquito-eating fish. Mosquito-eating fish are small fish, 4-6 cm long (occasionally large individuals appear), although such a small body, but the mosquito-eating fish can swallow 40-200 mosquito larvae, or even more than 200 mosquitoes, from the source to reduce the breeding of mosquitoes.
Mosquitoes lay eggs, as well as hatch and grow
And the reproductive ability of mosquito-eating fish is very strong, for the egg fetus, the fish eggs hatch in the body, when the temperature is suitable, every 30-40 days to give birth, 20-40 small fish per birth, breeding 3-7 times a year, small fish can mature after more than 1 month, so as to reproduce the next generation, strong fecundity, indeed can control the breeding of mosquitoes, which is also one of the reasons why it is called "angel".
Mosquito-eating fish can reduce the occurrence of some infectious diseases, mainly dengue fever, and the vector of dengue fever is mosquitoes (the common mosquitoes that cause dengue fever are Aedes mosquitoes, including the two genera of Aedes aegypti and Aedes albopictus). After the patient or carrier is bitten by a mosquito, the mosquito bites the healthy person again, resulting in the healthy person suffering from dengue fever, an acute insect-borne infectious disease. Mosquito larvae live in the water, and the way mosquito-eating fish kill mosquito larvae jié jué can reduce the number of mosquitoes and thus prevent infection from the source.
The Guangzhou Municipal Water Bureau publicly stated that in response to the severe dengue fever epidemic, the bureau not only cleared water and killed mosquitoes such as water supply manholes, sewers, drainage inspection wells, rainwater inlets, and green belts within the river surge, but also released mosquito-eating fish in some water bodies. ——Source, Xinhua Net, October 16, 2014. This can also prove that mosquito-eating fish can indeed reduce the incidence of infectious diseases.
Mosquito-eating fish that eat mosquitoes
<h1 class="pgc-h-arrow-right" > why are mosquito-eating fish called "devils"? </h1>
Secondly, why are mosquito-eating fish called "devils"? There are many places known as devils, first of all to destroy the indigenous ecological chain. The composition of the fish ecological chain is unknown after how many years of evolution, and the entry and exit of any kind of fish will have serious consequences for the ecological chain. For example, after the mosquito-eating fish breed in large quantities in the waters, they seriously occupy the growth space of native fish, such as the medaka. Medaka and mosquito-eating fish belong to the same medaka family of fish, the diet is the same, but the medaka is more docile competition but mosquito-eating fish, resulting in China's native fish medaka almost disappeared in some places.
Another reason is that there has been a large reduction in native fish, and regular anglers know that fish must have a variety of predatory skills to survive. However, there are not a few "speculative" fish, and mosquito-eating fish is one of them. Mosquito-eating fish don't just eat jié jué they are omnivorous fish that meet what they eat and are not picky eaters. When fish spawn in the spring, in addition to swallowing fish eggs, they also swallow a large number of fry. Because these eggs and fry are easy to hunt.
The shallow water area of the park is densely packed with mosquito-eating fish
The harm of mosquito-eating fish is not only this, do not look at its small size, there are many reports that "mosquito-eating fish are not particularly fond of widows." Australians believe that their effectiveness in killing mosquitoes is actually not as good as some indigenous fish. However, after they enter the mainland, due to their fast reproduction speed, strong reproductive ability, and fierce and aggressive, even when food is scarce, they will fight.
Scientific studies have shown that mosquito-eating fish can not completely eat mosquitoes to survive, in the experimental environment, feeding mosquito-eating fish every day will cause malnutrition and even death, so it can not eat mosquitoes alone. There are fewer and fewer fish in the waters, especially some small fish can not compete with mosquito-eating fish at all, resulting in a large decrease in fish, which can also be said to be a "tragedy" caused by mosquito-eating fish!.
<h1 class= "pgc-h-arrow-right" > there are actually many mosquito-eating fish and animals</h1>
So didn't mosquito-eating fish eat mosquito larvae before the introduction of mosquito-eating fish? "Yes", and very much, it is well known that fish hatch from fish eggs and then grow slowly. Almost all fish in the nursery stage will use mosquito larvae as food, and plankton, zooplankton, mosquito larvae, etc. in the water are indispensable foods for the fish larval stage. Moreover, there are many small fish that eat mosquito larvae for life, such as: fish belonging to the same family as mosquito-eating fish There are 4 species in China: medaka, small medaka, Chinese medaka and humpback medaka.
The difference between mosquito-eating fish and medaka
Not only medaka fish, China's native fish: fighting fish, salmon, wheat ear fish, etc., many small fish from birth to death, their main food is the mosquito larvae, even some large fish, crucian carp, carp, grass, bream also like to eat mosquito larvae. (Red worms, the larvae of the mosquitoes, are a natural food that we often use for our fishing enthusiasts and are the main feed for goldfish as well as ornamental fish.) Secondly, after the mosquito's larvae transform into adult mosquitoes, even if they can fly, it is not safe, and frogs, geckos, spiders, etc. on land are natural enemies of mosquitoes.
Frogs prey on mosquitoes
So since mosquitoes have so many natural enemies, why do we feel that the number of mosquitoes has not decreased, but has increased? The reason is nothing more than the change of the environment, we pollute the environment, destroy the environment, and say that the environment has deteriorated! First of all, in the case of fish, there are fewer and fewer fish in the waters, far from enough to prey on mosquito larvae, resulting in a large number of mosquitoes. The imbalance of the aquatic environment and the fact that there are fewer and fewer fish are one of the reasons for the large number of mosquitoes, and now many waters are almost a pool of stagnant water, and the mosquitoes' larvae have no natural enemies, so there are more and more mosquitoes.
Geckos prey on mosquitoes
When the bald head was a child, whenever it rained in the rural hometown, the sound of frogs in the field was continuous, and the sound of frogs was endless at night, but it had already become history, and the occasional frog chirping was just a "rare corner"! Geckos are even rarer animals, once every night geckos climb all over the wall, especially under the lights, the lights can lure the arrival of mosquitoes, near the lights on the wall more geckos, now has not seen the figure of the gecko for a long time.
Even the most common dragonflies are rare, and the larvae of dragonflies, as well as the adult insects of dragonflies, feed on mosquitoes, and the scenery of large flocks of dragonflies flying has long been a thing of the past. Why are there so few of these mosquito-eating animals? In addition to environmental pollution, as well as the use of pesticides. The main reason is that we don't allow them to grow! Some people hunt them in large quantities for the sake of profit, and after hunting, they say that there are too many mosquitoes, and the responsibility is pushed away!
Dragonflies prey on mosquitoes
<h1 class= "pgc-h-arrow-right" > control the number of mosquitoes and less bites, which requires us to work together</h1>
Located in the East Bank of the Luxi River Xianshuiyan Scenic Area of Xujia Village, a total of more than 50 households more than 200 people, there are no mosquitoes in the village so called "mosquito-free village", according to the final reveal, there are 3 reasons for the absence of mosquitoes, one is the village's special geographical location, surrounded by mountains on three sides, one faces the water; the second is that the village is planted with eucalyptus trees to have mosquito repellent functions; the third says that there is a cave not far from the village, there are thousands of bats in the cave, and every night they enter the village to hunt mosquitoes. In fact, the biggest reason why the bald head feels that the environment is better, the mountains and rivers are beautiful, the water quality is not suitable for the growth of mosquitoes, and mosquitoes are also related to the many natural enemies of mosquitoes. (Thousands of bats)
Only the environment has become better, and there are no mosquitoes in the villages
Bald head feels that if you want to reduce the population of mosquitoes, it is not difficult to say, and it is not simple to say. The difficulty is that we need to jointly maintain and protect the environment, only if the environment is good, the water is no longer suitable for the growth of mosquitoes, and the number of mosquitoes is getting smaller and smaller. Only when there are more and more fish in the waters and more and more natural enemies of mosquitoes on land, mosquitoes will naturally be fewer, and we will be less bitten.
It is not simple to say that it is not simple, because many people do not have the awareness of protecting the environment, always feel that so many people live, pollute the environment more than I am not much, less than me a lot, the country's 1.3 billion people, even if only a few people throw a little garbage, this number is also astronomical. After these garbage enter the water, it causes water pollution and excessive water quality, thus creating a suitable living environment for mosquitoes, and mosquitoes finally suck your blood! Only when we work together to care for the environment will there be fewer mosquitoes.
Only when the sky is blue, the water is clear, and the mountains are green, will the environment get better and better
Postscript: The reason why the mosquito-eating fish is controversial is because it is an "angel" on one side and a "devil" on the other. To say that it is an angel is that it can reduce mosquitoes; to say that it is a devil, is that it occupies a large number of growth spaces for native fish, causing a large reduction in native fish, thus destroying the aquatic environment! Also, do you think that the mosquito-eating fish is an angel or a devil?
Here the bald head calls on all anglers to take away the garbage they produce when fishing in the river, not to pollute the environment, to protect the environment from ourselves, let us work together, and our environment will be more beautiful.
This is the bald head for the understanding of mosquito-eating fish, the wrong place brothers more point out, the bald head one by one correction, hope to inspire you, everyone feels useful words can be collected, like, forward to learn more about the headline number "Skinhead Fish Commander" Thank you.
References: "Aquatic Encyclopedia" Mosquito-eating Fish Status, "Baidu Encyclopedia, Scientific Encyclopedia" Mosquito-eating Fish, "The Harm of Mosquito-Eating Fish"