Long snooker is a catfish, catfish, catfish, also known as catfish. In different places, carp has different names, such as "carp mouse" in Shanghai, "Jiangtuan" in Sichuan and "ichthyology" in Guizhou. Long snout, conical snout, protruding forward. Lower mouth, crescent shape, thick lips and small eyes. It must be four pairs, the small one. Scale-free, dorsal fin and pectoral fin are serrated at the posterior edge of hard spine, lipid fin is thick, and caudal fin is deeply bifurcated. The body color is pink, the back is slightly gray, the abdomen is white, and the fins are gray and black.
Breeding technology:
I. Requirements for pond conditions
The water quality is fresh and the dissolved oxygen is high, and the pH value is 7 ~ 8.2. Therefore, the pond should be located near the water source, with convenient drainage and irrigation and quiet environment.
Generally, the pond area is 1, 000 ~ 3,000m2, and the water depth is1.5 ~ 2m. The wall of the pond is hardened with masonry or cement, and the silt at the bottom of the pond does not exceed10cm. Each pond is equipped with a 3 kW impeller aerator. ?
Second, fish stocking:
One-winter-old fish species domesticated artificially are selected, with strong physique and neat specifications. Generally, 800 ~ 100 species of fish, 250 ~ 300 silver carp, 75 ~ 100 bighead carp, and 5 mandarin fish or perch are released per mu.
Fish stocking is generally better in early March. 10 The day before releasing fish, the whole pond was sprinkled with quicklime100 ~150kg/mu chemical slurry, and the water was released to the required water level after 7 days. Before stocking, soak in 15 ~ 20mg/L potassium permanganate solution or 3% ~ 5% salt solution 15min to kill pathogens and enemies.
Third, feed feeding.
After long snooker is domesticated at seedling stage, it is mainly based on compound feed, and its crude protein content should reach 40% ~ 45%. The main raw materials are imported fish meal, dried fish, bean cake, peanut cake, wheat bran, yeast powder, mineral salts, vitamins and so on. , and made into 3 mm, 4 mm and 5 mm hard pellet feed. At first, the feed particle size was 3 mm, and later, with the weight gain of fish, it was changed to 4 mm and 5 mm. Feeding should be fixed, timed and quantitative, and a feeding platform should be built on one side of the pond.
Domesticate fish after stocking. First, use sound training on the feed table to make the pond fish form conditioned reflex. Then slowly feed them with water by hand, twice a day, at 8: 00 am and 8: 00 pm, with a feeding ratio of 4: 6 in the morning and evening. Be careful every time until the fish is finished and left. The daily feeding amount is generally 1.5% ~ 3%.
Fourth, water quality supervision.
Dragon-snooker likes pool water with fresh water and high dissolved oxygen. At ordinary times, we should strengthen water quality management, insist on adding fresh water frequently, start the aerator in time, and rationally use biological agents to regulate water quality.
June-September is the peak season for the growth of long snooker, so it should be washed every other day, and the water should be changed once a month, and the amount of water changed is 1/4 of the pool water. Increase oxygen-increasing equipment as much as possible and start the oxygen-increasing machine at the right time. Start time is noon on sunny days, early morning on cloudy days, midnight on rainy days, not at night, floating head early, and every day during the growing period. The operation time is short at noon, long at midnight, short in coolness, long in sultry days, heavy in load, long in time, light in load and short in time.
Conventional application of photosynthetic bacteria, the dosage is 10 ~ 20g/m3. Sprinkle quicklime water regularly, usually once every half a month in the breeding period, and the dosage per mu is 5 ~ 10 kg. Always keep the dissolved oxygen in the pond at not less than 5mg/L, the pH value at 7.2 ~ 8.2, and the water transparency at 30 ~ 40cm. However, the water quality should be flexibly controlled according to the season and the water quality of the pond. The water quality should not be too thin and the medium water quality should be light.
If the water source is sufficient and the temperature is suitable, the micro-flow water can also be supplemented by regular flushing.
Verb (abbreviation for verb) daily management?
Patrol the pond frequently, insist on patrolling the pond every morning, noon and afternoon, remove residual feed and dirt, clean up the feeding table and observe whether the fish in the pond have floating heads. In hot summer season and sudden change of weather, it is necessary to increase the number of night patrols or arrange night shift management.
Start eating early and feed and domesticate the fish the next day after stocking. Combined with patrolling the pond, observe the weather, water color and fish eating every day.
Every 15 days, fish were randomly selected to check their food intake and fatness. By weighing and counting, the growth rate of fish, the total amount of fish in the pond and the titer of feed are calculated, and the feeding amount in the next stage is determined.
VI. Disease Prevention and Control
The whole pond is sprinkled with quicklime once every half month, and the dosage is about 10kg/ mu. Add 1.5% allicin to the feed for a long time, and feed it once a month for three days to prevent enteritis. Spraying chlorpyrifos and copper sulfate alternately to the whole pond at the concentrations of 0.2-0.3g/m3 and 0.3-0.3g/m3.
In feeding management, it is necessary to observe the feeding situation of fish at any time, and find abnormal reactions or sick fish, and treat them as soon as possible.
Before stocking fish, the culture pond in 10~ 15d should be strictly dredged and disinfected, with the ratio of 0.1~ 0.2 kg/m&; # 178; After the quicklime is dissolved, it will splash all over the pool water or be disinfected with chlorine-containing disinfectant.
In the process of breeding, it is necessary to clean up straw and other green feed residues in time, and remove dead fish in time. In the epidemic season of fish diseases, the dosage of lime should be 20 ~ 25g/m &；; # 179; The water splashed all over the pool; Or spray chlorine-containing disinfectant for disinfection.
Before stocking, fish should be soaked in 3%~5% salt water for 5 ~ 10 minutes. Before stocking, the inactivated vaccine of grass carp hemorrhagic disease, bacterial enteritis, gill rot and erythroderma was injected into the muscle of pectoral fin base, and the injection dose was 0.3~0.5 mL per tail.