Disease prevention of fish before storage and transportation

As the saying goes, "if you want to buy a chicken, you have to buy a fish." However, after a year of hard work, many households have encountered difficulties in the season of adult fish. Fish are not resistant to storage and transportation, their whole bodies are congested, and even dead fish appear. At this time, most farmers think that there is something wrong with the feed. Indeed, in order to unilaterally reduce the feed coefficient and improve the growth rate of fish, some feed manufacturers add hormone or hormone-like drugs, such as olaquindox, to the feed, resulting in the above phenomenon in the process of fish storage and transportation. However, there are many factors causing fish intolerance to storage and transportation, which can be divided into three types, the first is caused by olaquindox poisoning, the second is caused by Gill disease, and the third is caused by bacterial hemorrhagic disease. The following is a specific analysis of these three situations, and puts forward the corresponding countermeasures.

1. Olaquindox poisoning and its countermeasures

This condition is mainly manifested in the whole or local hyperemia and redness of the fish, especially in the cheek, abdomen, Pomfret and base, the Gill is bright red or crimson, and the mortality rate is very high on the day of long-distance transportation. Corresponding countermeasures: because there is no effective drug treatment, we can only stop feeding the feed containing quinolinol, properly control the growth of fish, and sell it in batches.

II. Gill disease and its countermeasures

The main symptoms were inflammation, swelling, proliferation and healing of epithelial cells at the end of Gill lamella. Microscopic examination sometimes shows a large number of myxosporidium parasitism. The mucus on the gills increases, and the gills are swollen and inflamed. Fish lack vitality and have less mucus on their body surface. After long-distance transportation, some fish swam weakly on the surface of the water and showed symptoms of hypoxia. The mortality rate was lower on the first day and higher on the second to third day. There are bloodlines in the abdomen of the fish and the phenomenon of desquamation and nail removal. Corresponding countermeasures: fish disease prevention and control one month before the sale of fish. ① sprinkles 90% crystal trichlorfon in the whole pool. 0.5g / m3. Once a day for 3 days. ② sprinkled chlorine dioxide in the whole pool once a day for 2 or 3 times. Take ③ medicine bait internally and feed it with 50 grams of dysentery for 3 days every 50 kg of feed.

III. Bacterial hemorrhagic disease and its countermeasures

The main symptoms were congestion and bleeding of body surface and various organs and tissues, exophthalmos, redness and swelling of anus, enlargement of abdomen, upper jaw, mouth, operculum, abdomen, fin base hyperemia and redness. Dissected abdominal cavity with yellowish or red ascites, enlarged liver and kidney, severe anemia, intestinal wall congestion, mesenteric bleeding. Dead fish can be seen when they are not transported, and the transportation mortality rate is high. Corresponding countermeasures: fish disease prevention and control one month before the sale of fish. ① sprinkled chlorine dioxide in the whole pool once a day for 3 days. ② oral bait, every 50kg feed with 50g of liproterin and 750g of rhubarb juice mixed with bait for 3 to 6 days.