From the consumer's point of view, the larger the eel, the more meat under the hot pot is more delicious, so the eel that is farmed before the eel spawns has always been the favorite of diners, in the case of not considering the price, no one does not like large-size eel, will eat the eel meat will be picked out, and then the remaining eel skeleton, as well as the eel head is collected. Such an eel can be made into at least three dishes, one eel meat, one eel head, and the skeleton of the eel for boiling soup is a delicious dish.
But in many people's minds, there is a view that the longer the growth period, the larger the eel, the more parasites are carried in the body. The scope of dissemination of this view is still relatively wide, and the audience is relatively large, including some old farmers. Regardless of whether this view is correct or not, the biggest argument or evidence for those who agree with this view is that the large-sized eels that were and are currently fished in natural waters such as rural ditches and lakes have been tested to contain more parasites than small-sized eels under the same conditions, so that diners who like to eat eels feel uneasy and psychologically reject large eels.
I used to think that there was no necessary connection between the number of parasites in eels and the size of eels, I had not observed and studied them, but I had a deep understanding of the connection between snakes and parasites. Our southern region is densely covered with water network, eating snake meat is a habit, but also a very common phenomenon, the most seen is the water snake, green snake and red chain snake, etc., remember before catching a lot of small snakes, touch the skin of the snake feels smooth and smooth, but once again caught an oversized red chain snake, the skin of this snake feels that there are countless knots on it, with the naked eye can see these knots are still moving, it can be said that the view of the large snake parasite is deeply rooted in my heart. I think eels have similar habits to snakes, so it's normal for people who hold the view that the longer eels grow, the more parasites there are, and there is a big market.
But my point is that the length of eel's growth years is not necessarily related to the amount of parasites in the eels. The amount of parasites in the eel depends on the ecological environment in which the eel is located. That is to say, the harsher the environment with serious water pollution, the more parasites that grow out of the eel body, the more water bodies with serious acidification of organic matter, the lack of dissolved oxygen, the more harmful bacteria and parasites contained in it, and the more parasites in the body of these eels. This is true in both natural waters and captive farming conditions, so you can find that eels living in wild ditches are a little dirtier, while eels living in rock crevices along the river in flowing water environments carry much less parasites.
Guess if there are any parasites
<h1>To make my point of view thorough, I will first analyze it from the different living environments of eels:</h1>
1, a good ecological environment: the good ecological environment of eels mainly has the following hard indicators of sufficient dissolved oxygen, abundant aquatic plants, rich in algae and zooplankton, so that on the one hand, it can ensure that eels have sufficient natural Russian and Japanese Austrian feeding, can allow eels to grow rapidly within the specified time, while sufficient dissolved oxygen can ensure that the growth environment of eels is safe and healthy, we know that most of the ecological environment deterioration is produced under the premise of lack of oxygen, the amount of dissolved oxygen is insufficient, Anaerobic harmful bacteria and harmful parasites breed in large quantities. In this way, without manual intervention management, eels can easily parasitize a large number of different parasites. There are two more cases here, eels can live in still water bodies and in microcirculatory water bodies, the former represented by wild ditches and rice paddies. The latter is represented by rivers and lakes, compared to the former' farming density will be larger but the growing eel is less expensive, the latter is less dense but the relatively growing eel is larger, and the probability of eels growing in the flowing water environment is much less likely to be infected with parasitic diseases.
2, poor ecological environment: no matter which kind of aquaculture project poor ecological environment has some common characteristics, basically serious lack of oxygen, many oxygen-consuming organisms including a large number of acidified organic matter, while anaerobic harmful bacteria and parasites will breed in large quantities, water transparency will usually be seriously insufficient, and water bodies will usually be black and smelly, these are a large number of organic matter in an anaerobic state degradation of the natural formation of harmful substances, mainly including nitrites, hydrogen sulfide, organophosphorus, Molecular amines and other harmful substances, of course, there are not a large number of parasites, in fact, eel farming and crayfish farming have many commonalities in the management process, but the specific diseases infected with parasites are different.
<h1>Specifically, parasites that are easy to parasitize in eels mainly include the following categories, as follows:</h1>
1, Eel trypanosomiasis: This disease is caused by trypanosomiasis. Because trypanosomiasis parasitizes the blood of eels, the eels eat a reduced diet, stiffen their mobility, and their bodies are thin, and the eels often lie asleep naked on aquatic weeds. It should be noted that this parasite is based on ants as the host, so in addition to using quicklime to clear the pond before stocking, the best way is to eliminate the ant, and before the onset of the disease, avermectin can be used to prevent it. But a little onset, theoretically there is no specific drug, some people suggest the use of copper sulfate to treat, but because of the use of too much copper sulfate on eels has a great harm, casually recommended to use the best use of the best use of only twice and can not be used continuously, the interval between 5 to 7 days, otherwise it is easy to cause a large number of eel drug dosage form poisoning death will be overpaid.
2, eel fibrillation cryptoflagellosis: this disease is caused by cryptoflora parasitism in the blood of eels, the harm is not great, but when serious infection, can cause eel anemia, thin body, poor growth, often the body is exposed with aquatic plants on the sleep. The method of prevention is also based on the thorough clearance of the pond by quicklime, note that once this parasitic disease occurs, there is no effective treatment, and the method of treating trypanosomiasis can be tried.
3, eel echinococcosis: echinococcosis is one of the most common parasitic diseases of eels, which is caused by echinacea parasitizing in the intestines of eels, its parasitism can cause eel Zen road congestion and inflammation, part of the address necrosis, a large number of parasitism in the eel body is easy to cause eel intestine perforation, and lead to low appetite of eels, slow growth, until death. Since echinococcosis occurs all year round in both cold and hot, in order to avoid the onset of eels, it is best to use quicklime to clear the pond of the water body before stocking, killing the middle host, The Lorraine Flea. From April to August every year, the use of avermectin, the whole pool is sprinkled, 1 to 2 times a month, which can effectively prevent the occurrence of the disease.
4, eel nematode disease: Nematode disease can be said to be one of the most common parasitic diseases of eels, which is caused by the parasitism of nematodes in eel tipian and internal organs. The larvae of the nematode attach to the intestinal wall and the mesentery in the form of a sac, and the onset eel has no obvious symptoms on the appearance, stops eating, gradually loses weight, and finally causes death. If you dissect the eel that has died of illness, you will find that the intestines of the eel are inflamed and red, and the larvae of the nematodes can be seen with the naked eye. When parasitic in small quantities, it has little harm and effect on eels. However, a large number of parasites will reduce the disease resistance of eels, resulting in other diseases. The infection rate and infection intensity of this nematode increases as the eel grows. Many times we often say that the common eel parasitic disease refers to this, the growth time is long, the long large eel will have a bumpy touch on the surface, therefore, this parasitic disease is the most representative. It should be said that it is generally said that eels grow large, and the more parasites there are, the parasitic disease referred to is this.
The control method for nematode disease is usually to sprinkle the whole pond with dimethoate crystals and take allicin powder mixed with bait feeding, feeding continuously for three consecutive days, once a day.
5, eel solitary trematodiasis: this disease is caused by solitary trematode parasitism. Lone fluke parasitizes in the stomach of eels, causing eel stomach congestion and inflammation, eel body emaciation, slow growth. The control measure is also to use quicklime to clear ponds before stocking. The remedy after the onset of the disease is to use an appropriate amount of mebendazole for three consecutive days.
6, eel ant ant disease: ant ant is very common in freshwater aquaculture, generally ants with suction cups attached to the body surface of eels, to the front half of the eel body epidermis is the easiest to adsorb, mainly to suck the blood and body fluids of eels for food. A large number of ants in the eel, will cause it to be malnourished, weak, but also cause bacterial secondary infection, in severe cases can lead to the eel all dead. The control method of this disease is as follows: before stocking, use quicklime shrimp fields (pond mouths) or other water areas for thorough pond disinfection to eliminate ants. From April to August of each year, the whole pool is sprinkled with dimethoate crystals, 1 to 2 times a month, to prevent the occurrence of ant disease.
<h1>brief summary:</h1>
Above I introduced the focus on the general eel parasitic disease and prevention methods, it can be seen that parasitic diseases will often occur with the deterioration of the ecological environment, but through the artificial drug management of farmers and early prevention, can be effectively controlled, so it can be said that wild eels in the absence of human drug management, the probability of parasitic diseases is still very common, but it also depends on the specific environment, generally speaking, the probability of eels getting parasitic diseases in still water environments is higher than in the flowing water environment For example, the probability of eels growing in rivers and lakes infected with parasitic diseases is much less than that of eels growing in ditch ponds, catching wild eels encountering eels infected with parasites is more, but eels grown in artificial breeding environments can effectively avoid eels being infected by parasites as long as the water quality management is in place The disease prevention can effectively avoid eels being infected by parasites, do not pay attention to management, water quality deteriorates, eels under artificial breeding conditions will still appear the possibility of being infected by parasites, maybe eel fry have a lot of parasites, and the water quality is fresh. Eels that have been growing for more than two years also carry few parasites.
Therefore: the final conclusion is that the parasites carried by eels have nothing to do with the growth period, but with the growth environment and artificial management, and through effective artificial intervention, the number of parasites in the eel can be reduced.