The high temperature has dropped, and the disease is relatively less worrying. Therefore, many farmers are ready to catch the fish in the pond quickly, or some are worried that individuals will not meet the specifications by then. However, some people have encountered problems, and the fish are not well fed, which can make the farmers anxious to sleep well. Recently, many intensive fish ponds have been treated and poorly raised, all of which are related to parasites.

The case was introduced to a fish pond in Pixian County. I went fishing that day and found many crucian carp floating on the water. I measured the dissolved oxygen at that time at 5.0, and then asked if the fish load in the pond was more than 2,000 kilograms per mu, which should not float. At that time, it was speculated that it was mostly bugs. Microscopically again, there is myxosporidia on the gills. Later, the boss gave the fish a spore net oral liquid according to my request. I suggested taking it for four days, but he only used it for one day. The next day, the fish didn't come up. However, due to incomplete medication, it was not long before the fish floated again.

Related experience This season is also a season of high incidence of parasites, such as giant salamander, rotifer, anchovy and Chinese herring. When fish are parasitized by parasites, they feel uncomfortable. When there are more rotifers, trypanosoma or giant salamander parasitic on gills, gills will be stimulated, mucus will increase, and the ability to use oxygen will decrease, resulting in a decrease in food intake.

Through two cases of fishing in fish ponds, combined with some experiences and methods summarized in fishing, I have more understanding of eating fish. Eating fish badly must be related to dissolved oxygen. Dissolved oxygen is due to lack of oxygen in water and lack of oxygen in body.

The parasites here are the source of hypoxia. Due to the wound caused by parasites, when a large number of parasites are parasitic, bacterial infection will occur, and then inflammation will occur. Severe bacteria will colonize the blood and then multiply in large numbers, leading to sepsis. Like Aeromonas hydrophila, the hemolytic enzyme produced can dissolve hemoglobin. When a large amount of hemoglobin in the blood is dissolved, the oxygen transport in the fish will be affected, and the symptom is hypoxia.

Fish can't eat well naturally at this time. For example, Mr. Liu, who lived well two months ago, raised 100 mu of grass carp in an intensive pond. Fish can be sold before July, when the price of grass carp is the highest. However, due to the previous fish disease, no parasites were detected, which was actually caused by parasites. This fish eats badly and keeps dying. At that time, after using pesticides, fish diseases that died for two or three months were controlled, and there were many similar situations.

It is suggested that healthy farming should be advocated now, all of which are to dilute pesticides, and it is definitely not necessary to disinfect pesticides every month. However, when the water temperature is suitable for parasite reproduction, and there are a large number of conditions for parasite reproduction and outbreak in the water body, and there are many organic substances, it is still necessary to do a good job of pest control. If a certain number of parasites are found, it is best to kill them.