Conditions of the breeding pond. Farming blackfish, fish pond area should not be too large, to 1 ~ 2 acres is better. Water depth of 1.5 to 2 meters, shallow substrate, inlet and outlet must be set to prevent the escape net. Before stocking with quicklime to disinfect the fish pond. At the same time, in the pond around the planting of 80 ~ 100 cm wide water floating lotus. In this way, not only can prevent the blackfish from jumping out of the pond, but also shade.
Stocking fish species. Buy fish species in the bazaar, although the price is lower, but the specifications are not the same, and due to capture and other reasons for the fish body injury, so it must be disinfected before going into the pond, can be 2.5% to 3% of salt water or 0.001% of the bleach solution to soak the fish body for 15 to 20 minutes.
The stocking density of fish species should be determined according to the feed and water quality and other conditions, generally stocked per mu of about 10 cm in length of fish species 1000 ~ 1500, and can be set 200 ~ 300 large size chub species, can also be stocked with dozens of adult tilapia, with its hatchlings for the blackfish to eat.
Feeding bait. Blackfish bait has animal offal and a variety of small fish and shrimp. Some farmers use chicken intestines feeding, also achieved good results. If you raise your own yellow mealworms, fly maggots or earthworms, you can solve the bait problem and greatly reduce the cost of farming. Blackfish can also be fed with artificial bait, the formula is: 70% of minced fish and shrimp, 20% of soybean meal, yeast 5%, the rest of the multi-vitamin mineral salts, growth promoters and antimicrobial agents. Baiting twice a day, the amount of bait for 5% to 7% of the weight of the fish, to most of the fish to eat enough for the difficult. The use of artificial bait, must be from a young feeding training. Initially, you can put earthworms or minced fish and shrimp meat on the food table, and hang the food table 20 centimeters below the surface of the water to lure the fry to feed, and then gradually increase the amount of bait after the fry get used to feeding on the food table. Don't feed live bait in the middle of feeding training to avoid affecting the training effect.
Strengthen daily management. Morning and evening visits to the fish pond, check the growth of fish, clean up the residual bait in a timely manner, and regularly disinfect the food table, available 0.001 ‰ of bleach for sprinkling. Every half-month with 15 kilograms of raw ash per mu, the water slurry sprinkled throughout the pond. Also regularly flush new water to keep the pool water fresh.
1, pond conditions: pond area of 1 acre, water depth 0.8-1.5 meters (0.8 meters in early spring, 1.5 meters in the hot season). Pond water surface stocking accounted for 1/5-1/3 of the total area of aquatic plants such as peanuts, water flora.
2, the production process: in February to put the blackfish species, April-June to strengthen the feeding, the end of June to start catching adult fish for sale; July to put the current year's blackfish summer flowers, in mid-late July to October to strengthen the cultivation, November-December fertilization of fry, the end of the year to sell fish species.
I, adult fish farming
1, fish seed placement: February 10 per mu to put the specification of 4-5 per kilogram of blackfish species 4500. Fifteen days before stocking, each mu with lime 80-100 kilograms of dry method to clear the pond. At the same time, 80 tilapia with specification of 200 grams/tail per mu were set up to breed seedlings as feed for blackfish. Before the fish seed in the pond with 5% salt solution dip 10 minutes.
2, strengthen feeding: advocate the early start of food, April-June intensive feeding. Mainly feeding fresh wild fish and shrimp, animal scraps. Feeding according to the weather, water temperature, fish activity to determine the amount of feeding 2 times a day, 9-10 am, 4-5 pm each feeding 1 time, daily feeding in the pool of fish weight 2-10%, each time to feed 8 into full.
3, control water quality: regularly refill new water, maintain pool water transparency 30 cm. High-temperature season every 3-5 days to add 15-20 centimeters of water, other times every 10-15 days to add water once. When it is not convenient to add water or change water, splash EM original dew, sea in the treasure to remove ammonia, hydrogen sulfide and other toxic substances in the water, stabilize the pH value of the water body; regular application of quicklime, per mu of water surface 1 m water depth with 10-15 kg.
4, disease control: the main prevention and treatment of ulcerative disease, hepatobiliary enlargement disease. mid-April began to apply quicklime every half a month, internal enrofloxacin (content of 5%, 200 grams of drugs per 100 kg of feed fish), florfenicol (content and dosage of the same enrofloxacin), Allicin Powder (content of 10%, 100 grams of drugs per 100 kg of feed fish) and so on, choose a kind of, even with 3-5 days. 5 days. Or use chlorine dioxide, bromochloro hydantoin, dibromo hydantoin, etc. regularly sprinkle the whole pool to prevent.
Two, fish species cultivation
1, summer flowers put: Note: First, thoroughly clear the pond; second, careful operation, to prevent fish injury; third, the pond according to the ratio of 2:3:5 with a mesh partitioned into three small pools, in order to be divided into pools later on, the first will be the summer flowers in the largest pool. July 20 per mu to put the specification of the blackfish summer flowers for the 6 cm of 12,000 tails or so.
2, feeding management: domestication 10 days, so that the fish to develop a regular, regular feeding habits. In the early stage, feed minced fish 4 times a day, later gradually changed to 2 times a day feeding (direct feeding of fresh wild fish and shrimp), and at night turn on the light to attract insects, supplemental feed.
3, water quality control: the same method as adult fish farming.
4, fish disease control: the main prevention and treatment of parasitic diseases such as rotifers, tongue cup worms, small melon worms. Treatment with formalin (10-30 ml per cubic meter of water, serious condition every other day and then 1 time), methylene blue (2-4 grams per cubic meter of water, serious condition with 2 times), copper sulfate (0.6 grams per cubic meter of water), Eumarin (0.6 ml per cubic meter of water), add water to the whole pool sprinkler, the above method of any 1 kind.
5. Graded rearing: in mid-August, screen the fry, put the larger size and smaller size of the blackfish fry into the other two small pools for rearing. 20 December from the start of the catch.
The above are two different articles. You can refer to them. The question is very specialized. I guess I have to ask the one from the Academy of Agricultural Sciences or someone who has experience in farming