Kanazawa is a golden yellow mutant line found in the rainbow trout population at the Nagano Prefecture Fisheries Test Center in Japan. In December 1996, the Heilongjiang Fisheries Research Institute introduced 10,000 ophthalmic eggs of the same type of homologous system from Japan. After more than three years of experimental breeding, the Heilongjiang Fisheries Research Institute has succeeded in the development of ovum eggs and broodstock breeding and artificial breeding. In Beijing and Heilongjiang, after two to three years of breeding into the first generation of domestic broodstock, the crossbreeding trials of the golden trout and rainbow trout have been carried out. Now it has become an important cultured species in the breeding industry in China. Disease prevention and control during the cultivation of the golden pheasant seedlings is the key to improve the survival rate. The main breeding diseases include rot disease, small echinococcosis, third generation worm disease, enteritis disease, abdominal distension, fin rot, and tympanum. Sum up a set of prevention and control methods, the effect is better, is introduced as follows:

1. Bacterial gill rot disease: This disease is the most common bacterial disease in the breeding of golden peony seedlings. It mainly affects the fish species from the floating larvae to about 10 g/tail. In the condition of high stocking density, increase of ammonia nitrogen in water, decrease of dissolved oxygen, and turbidity of water, it is easy to cause the disease.

1, the main symptoms: sick fish loss of appetite or stop eating, not lively, cover Zhang Zhang, slow swim in the pool and drain. The mucus secretes a large amount of mucus, the swollen cocoon, the lid closed abnormally, the ends of the cocoon filaments whitish, the individual cocoon silk has bleeding points, and the partial discoloration, the dead fish gradually increases, and the dead fish mouth opens.

2. Preventive measures: Reduce the stocking density of fish, increase the water flow and dissolved oxygen, keep the water quality of the fish pond clean, reduce the stimulation of harmful substances such as ammonia nitrogen, properly control the amount of feed fed, and avoid over-satisfaction. Careful management practices, especially in the event of heavy rain or grading, the application of appropriate drugs to disinfect the pool, reduce the chance of bacterial infection.

3, treatment: external use disinfection and internal phase lift. Dip with 1% to 2% salt for 30 minutes, dip 1 to 3 times; or dip with 0.5ppm to 1ppm povidone iodine for 30 minutes to 60 minutes, dip 1 to 3 times; or use 0.5ppm ~ 1ppm dibromohydantoin (10%) is soaked for 30 minutes to 60 minutes. The number of disinfections can be flexibly controlled according to the fish's constitution and incidence. Oral antibiotics, such as per 100kg fish body weight plus 8g ~ 20g oxytetracycline production bait feeding.

Second, the small melon worm disease: also known as white spot disease, the greater harm to the seed, is a popular, high infection rate, dangerous ciliate disease, if not treated in time, will cause a large number of deaths.

1, the main symptoms: small melon parasitic parasites in the body surface of the golden pheasant, fins, mouth, eyeballs and corpus callosum. When parasitizing on the body surface and fins, the host is surrounded by stimuli and secretes mucus, forming white vesicles, presenting many small white spots less than 1 mm. Parasitic in the eyeball, can make the eyeball cloudy and white. Parasitic on parasites, causing epithelial cell proliferation, increased mucus secretion, fibrosus adhesion, erosion, causing secondary rotten necrosis and mycosis. Diseased fish often sideways body, performance uneasy, swim on the pool edge, loss of appetite, death.

2, prevention methods: prevention of small melon worms, should be combined with the life history of small melon insects. The small melon worm is a protozoa that is brought into a fish pond by other organisms or instruments that infect fish or carry worms, or enter the fish pond with aquaculture water. Mature larvae form cysts immediately after leaving the diseased fish and adhere to the bottom of the fish pond, wall, or other solid surface. The cysts gradually divide into many individuals, that is, larval mothers. Usually, one cyst can form more than 2,000 larval maternities. Finally, it breaks out of the pouch and becomes infectious larvae. During this period, the larvae are full of long cilia. As a result, they swim to the fish and rely on the puncture glands on the head to drill into the skin and fleas of the fish, which is the most infectious. If no host is found within 1 to 2 days, the larvae will die on their own. Maintaining the cleanliness of the fish pond is very important for the prevention of echinococcosis.

3. Treatment: The treatment of echinococcosis has always been a problem that has plagued salmon farming. In particular, in recent years, the state has strengthened the management of fish medicines. Previously used mercury nitrite and malachite green are strictly prohibited. We use the following methods to treat small echinococcosis: During the incubation period in the hatchery (small fish ponds, quick water changes, and easy operation), use 2% to 3% salt solution for disinfection for 20 minutes to 40 minutes. When culturing in a large pond, it is dipped with 3ppm methylene blue for 60 minutes; or 300ppm of paprika juice and 300ppm of ginger sap are immersed for 30 minutes to 60 minutes to kill the small melon worm. In addition, a clean fish pond was changed every 7 days to reduce the chance of reinfection of small melon worms and dip with 1 ppm to 1.5 ppm dibromohydantoin (10%) for 60 minutes to prevent secondary infection of bacteria and water mold.

Third, the third generation of worms: mainly occurred in the late breeding period, little harm. Symptoms: Parasites are parasitized on the body's surface, axils, and fins. Swollen maggots, open maggots, dark black silk, dark dull fish, stray swimming, sick fish do not eat, and gradually thin dead. Control methods: Use 3ppm to 5ppm crystal trichlorfon for 40 minutes to 60 minutes.

Fourth, enteritis disease: common diseases for juvenile golden mullet, mainly harmful to juvenile fish below 5g. Symptoms: Intestinal inflammation, hyperemia, and no food, often filled with white or yellow mucus. Control methods: mainly bait control, antibiotic baits can be made to prevent and control. Compound sulfamethoxazole 100 mg/kg body weight of fish, continuous feeding 5 days to 7 days, the first day drug dose doubled.

V. Abdominal bloating: The main damage to the floating larvae to the 5g / tail of the gold seedlings. Symptoms: The affected fish's abdomen is swollen, with feed and water in the stomach. Control methods: reduce the amount of feeding; feeding florfenicol baits, the amount of 15mg/kg ~ 30mg/kg body weight of fish, continuous feeding for 5 days to 7 days.

6. Corrupt fins: The gold larvae seedlings are more prone to fulminal disease than the rainbow trout seedlings, and the main hazards are 10g/tail ~ 50g/tail seedlings, which can cause a small amount of death. Symptoms: Inflammation of the front part of the dorsal fin of the diseased fish causes bleeding lesions. Control methods: reduce the density of the culture, soak it with 1ppm bromohydantoin (10%) for 40 minutes to 60 minutes, or feed the baits, and add 8g to 20g of oxytetracycline per 100kg of fish body weight, and continuously feed for 5 days to 7 Day; Oral and external use combined better.

VII. Drums: Mainly caused by high nitrogen content in the breeding water, which harms 10g/tail ~ 50g/tail seedlings, which can cause a small amount of death. Symptoms: The diseased fish have prominent eyes, some of the eyeballs are necrotic or fall off. Control methods: Increase the dissolved oxygen in aquaculture water.

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