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Cultivation management 1 Stocking density and season In Jiangsu and Zhejiang coastal areas, first-inhabited fingerlings were raised during the wintering season and stocked in April of the following year. The stocking density was 3000-9000 tails/ha, and the initial tail weight was about 100 g. It was harvested from October to November. , Weight 300-400 grams; age of fish species stocking in late June, stocking density of 4500-15000 tail / hectare, initial tail weight 2-6 grams, to harvest in October-November, weighing about 100 grams. June-October is the most vigorous growing season for black cockroaches. Feeding management should be strengthened during this period. In the southern provinces, black storks have a longer growth period, and they can grow almost all year round in Hainan, where water depth is relatively high.
2 Feeding Science Feeding has a great influence on the growth of black mullet. To implement the "Four Sets" feeding method: feed each time in the afternoon and afternoon. Feeding should be fixed and the bait should be fed to a fixed location. Quantitative feeding is performed, and the daily feeding amount is 7.9-13.9% of the body weight. Every other month, the feeding amount should be adjusted according to changes in the total body weight and water temperature to meet the needs of the growth of black storks. The quality of the feed must be guaranteed, that is, the quality should be fed with fresh small fish, low-quality shellfish, and formulated feed. It is also necessary to use these feeds alternately. In addition, 10% Dendrobium powder must be added to the feed to increase the protein efficiency of the black buckwheat, improve lipid metabolism, increase fat content in the muscle, and improve the ability of the black buckwheat to withstand hypoxia and endure hunger.
3 Feeding Management Feeding Management Refers to the management of true breeding.
Disease Prevention (1) Vibriosis:
The fish surface ulceration, back, fin fin base congestion, eyeballs prominent, swimming delays, sometimes as mad swimming swim, loss of appetite, anal redness expansion `, with yellow mucus outflow. Anatomical observations revealed that the abdominal cavity had marked deep red spots and even had hemolysis and ulceration. The mortality of diseased fish was high. Juvenile juveniles, fingerlings, and adult fish have all been found, among which juvenile juveniles have a higher incidence and are in season 6-8 months.
Control methods:
Before use, the nursery pond is completely decontaminated with 100ppm bleach to ensure clean water; reasonable stocking density; live feeds to be fed are washed after seawater is fully fed, and feeds that are spoiled are not fed; care must be taken in daily operations. Avoid fish injuries.
treatment method:
1 Antibiotics have chloramphenicol 210-6, Quanchiposa, for 3 consecutive days; oxytetracycline 210-6 medicated bath for 2 hours, for 3 consecutive days.
2 furazolidone 1610-6 medicinal bath 2 hours for 5 days; or baits, the amount of 200g/100kg fish.
3 New dew meter bait, 200g/100kg fish, feed 5-7 days.
(2) White spot disease Black sea bream has been reported to have fish spot disease. Symptoms are many 0.5-1 mm white spots on the body surface. Mucus secretion is increased. The fish body rubs against the pool wall or jumps out of the water due to itchiness. In severe cases, loss of appetite, difficulty in breathing, floating head, and some scales fall off, causing death. The pathogenic body is a parasite of the protozoan Ciliate.
(3) Dystrophicidosis fish body itching, restless swimmers, rubbing the pool or other hard objects to the body, body color black, weight loss, a large area of ​​loose flakes, body surface ulceration, fin base congestion. The pathogenic body is egg dinoflagellates and has a strong ability to reproduce. The high-density culture quickly pollutes and can cause large numbers of fish to die in a short period of time. Onset season from August to September, water temperature 24-27 °C. Use 10-20ppm copper sulfate solution for 10-15 minutes once a day for four consecutive days. Due to the large concentration of drugs, it is necessary to pay attention to mastering and frequently changing the water.
(4) Increased secretion of mucus from fins and body surface, epithelial hyperplasia, decreased appetite, or food intake. The pathogenic body is a trichomonad. Onset season from July to August, the water temperature 26-28 °C. The worms reproduce faster, and when they multiply, they cause dead fish. Sprinkle with 2-3ppm copper sulfate in the whole pool. However, black cockroaches are more sensitive to the application of copper sulfate the next day should change the water, improve the environment.
(5) The Cryptosporidium disease shows a white spot on the fish's body surface. The body surface mucus in the sacral area increases, the body color turns black, and the silk and dark purple smash. Loss of appetite, slow swimming, and death at the end of the day. The pathogenic body is Cryptocaryon irritans. The onset season is from June to July and the water temperature is 20-25°C. With 2-3ppm of copper sulfate and 0.8-1ppm ferrous sulfate mixed solution, or 0.05ppm of mercury nitrate Quanchiposa once. After the second day of application, the whole pool changed water and improved the environment.
(6) The fish caught fish disease, irritability, and often jumped out of the water, mad mad chaos, loss of appetite, fish weight loss. The pathogenic body is fish gills. Parasites on body surfaces, tendons, and fins are sucked by suction cups and pierced through the skin to suck the body's nutrients. Onset season from June to August, water temperature 20-27 °C. With 0.25ppm 90% crystal trichlorfon or 0.15-0.2ppm dichlorvos emulsion, Quanchiposa, one can be. Medication once a week after medication, the effect is better.
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About the "black dragonfly" cultivation techniques
Breeding facilities Adult breeding of black cockroaches includes pond aquaculture and cage culture. The size of ponds cultured in black seabream varies from 0.025-1.1 hectares with water depths of 0.7-2.5 meters. Taiwan has also conducted trials in a cement pool of 551.2 m3. The use of cages (553 m3) or (10105 m3) for breeding is also effective.
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