Code of Practice for High-yielding Breeding of Aulatis Tilapia Ponds

Tilapia is a tropical fish that has been widely cultivated as a freshwater fish with its advantages of wide adaptability, strong fertility, miscellaneous feeding habits, strong disease resistance, high feed utilization rate, rapid growth, and meaty flavor. In particular, O. tilapia (Oreochromis niloticus, Nile tilapia) is welcomed by farmers because of its high male rate, rapid population growth, and high yields. Maoming City, Guangdong Province made full use of the advantages of local location and natural conditions to vigorously develop the aureus aquaculture industry and achieved remarkable results. Tilapia aquaculture has a certain scale in Maoming City. In 2003, tilapia monoculture and mixed culture area reached 380,000 mu, with a production of 13,003 tons, an increase of 44.73% compared with the amount of 89,845 tons in 2001, accounting for the same variety in the province. In 1/3 of the total, the tilapia breeding production ranks first in the province's production of the same species. Based on current pond culture techniques, aquaculture experience, and reference to the relevant A. tilapia technical data, operational procedures for the high-yield aquaculture of A. tilapia ponds have been developed.
1 Pond conditions
1.1 The area and depth of the pond area are 5-25 mu, preferably 10-15 mu. The depth of the fingerling pool is 1.0~1.8m, and the depth of the fish pond is 2.5~3.0m; the height of the pond is 35~55cm higher than the water surface.
1.2 The shape of the fish pond is rectangular, east-west direction is the best, is conducive to ventilation and sunshine. The aspect ratio of the fish pond is 1.5 to 3.0:1.
1.3 The bottom of the pool bottom should be flat, easy to pull net operation, loam or sandy loam soil, silt bottom control within 14 ~ 20cm, the pond water retention is good, no water leakage.
1.4 The source of water is surface water. The conditions of water sources for pond fish farming should consider the following factors:
1) Water quality should meet the requirements of fishery water quality standards GB11607-89;
2) The amount of water should be able to meet the needs of fishery production, especially in the main season of fishery production, from May to November, there is sufficient water to enter the pond for pond water injection and water exchange. The water exchange volume in the production season generally requires one time to change the water. ~20%;
3) Each pond has its own independent intake and drainage system;
4) The transparency of the pool is about 30 cm.
1.5 Power and supporting power of the fishing machine are guaranteed. The electric power of the commercial fish pond is required to reach 1kW/mu. When the conditions permit, the diesel generator with sufficient power is required as the self-supplied power supply. Each pond is equipped with 3kW impeller type or waterwheel type aerators based on the area size and stocking capacity. Smaller, shallower fish species pools can be equipped with 1~3kW water jet aerators. For ponds using hard pellet feed, each pond can be equipped with one or two automatic feeders. It is not possible to drain water by gravity, and it is equipped with sufficient injection and drainage equipment.
2 Preparation before restocking
2.1 The ponds are cleaned and the ponds, bottoms, and inlet and outlet pump systems are trimmed to avoid water leakage.
2.2 Sludge removal Sludge is removed once a year to ensure that the sludge thickness is controlled at 14 to 20cm.
2.3 Clear pond disinfection
2.3.1 Dry Method Clear Pond Dry Method Clear Pond is after the trimming of fish ponds, leaving only 8 to 12 cm deep water at the bottom of the pool, using tea bran for 4 to 5 kg per mu or quicklime for 50 to 80 kg dry pond clearing pond . After 3 days of exposure, return water. Water is filtered through 40 to 60 mesh nets to remove impurities.
2.3.2 Water clearing pond bleaching powder contains about 30% of available chlorine, bleaching 13.5kg per 1mu of water depth, ie 20g per cubic meter of water body, so that the water body becomes 20ppm concentration, or use quicklime 100-150kg.
2.4 After returning water from the base fertilizer pond, apply 250 kg of organic livestock manure per acre to develop water quality. Organic manure manure should be fermented and decomposed and sterilized with 1% to 2% lime. Fertilize after 7 days.
3 Sources, quality and specifications of farmed fingerlings
3.1 Selection of source of fish stocks Stocking species must be approved by the business department and have production sites for aquatic product seedling production licenses.
3.2 Stocking fish stocks require that the fish stocks are pure and of uniform specifications (with an individual variation of less than 10% in weight), have a healthy body, and have no injury or illness. All male tilapia species mainly selected hybrid F1 (Olympian) of pure Oreochromis niloticus and pure Nile tilapia, 92% of F1 generation of Uigurine and male of Taiwan, and arrested. More than 85% and faster growth of other hybrid F1 tilapia.
4 Fry cultivation
4.1 Breeding ponds The cultivation pond covers an area of ​​2 to 3 mu, with a water depth of 1.5m or more, adequate water sources, and convenient drainage and drainage. Before transplanting the seedlings, they shall be thoroughly cleaned, disinfected and exposed for 3 to 5 days.
4.2 Water is poured into fresh water 7-8 days before seedlings are released. Irrigation must be filtered through 40 to 60 mesh to remove impurities. The water depth is 80cm, after the investment (organic fertilizer, chemical fertilizer or green manure, etc.) is released, and the species are released after the plankton blooms. Ten days after stocking, the water depth increased to 1.5m.
4.3 When the temperature is released, the temperature difference between the transported fry water temperature and the cultivation pond water temperature is not to exceed plus or minus 2°C. The incubation water temperature is maintained above 22°C.
4.4 Putting seedling density at the same time put 8 to 10 million fry per acre and put it at one time.
4.5 The first 3 days after the cultivation and management of the fish seedlings are mainly used to feed the live blood of the livestock and poultry or cooked soybean powder; after 17 days, the powders such as cooked soybean powder, rice bran, yellow powder, and low flour are fed.
4.6 Fish seedlings
1) The fry is cultivated for 20 days. It usually grows to 3~5cm, then it can go out of the pond and raise vegetables and raise fish.
2) Out of stock. Stop feeding the day before leaving the pond. The nets are required to be smooth and detailed. It is advisable to open the net at 9:00 a.m. on sunny days to avoid opening the net under the hot sun. The operation is brisk, "do not hang water", that is, points that pass the pond.
5 Fish Breeding
5.1 The cultivating tank is disinfected with the fry pond before putting it into the pond. Water injection with 40 to 60 mesh filter to remove impurities. Applying pig manure or other livestock manure 250kg per acre to cultivate fertilizer water, organic manure manure to go through fermentation maturity, and use 1% to 2% lime disinfection, water quality fertilizer cool, transparency about 25cm, 7 days after the release of seedlings. Cultivation depth of 1.5m or more.
5.2 Stocking Density 0.8 to 15,000 fry of 3cm or 5cm fry per acre stocking size.
5.3 After feeding, the crude protein containing 32% of the pelleted diet was fed with a particle size of 1.5-2 mm. Feeding twice a day, 8 to 9 am, 5 to 6 pm, the amount of daily feeding for the fish body weight of 7 to 8%.
5.4 Breeding After 20 days of cultivation, grow into fingerlings. The length of the fish grows to 10~11cm and the body weight is 25~50 grams.
5.5 Disinfection of fish fingerlings Fish disinfection methods and methods are mainly the following:
1) Salt: Concentration 2%~4%, dip 5~10 minutes.
2) Bleach: The concentration is 10ppm to 20ppm, and it is dipped for about 10 minutes.
3) Penicillin: 80,000 units/50L, soaked in water for 5 to 10 minutes.
5.6 Stopping the feed the day before leaving the tank. 12 mesh smooth and fine nets and cages were used for rounding and sorting. They were opened and sorted at 9:00 a.m. on sunny days. Avoid operations under the hot sun. Sorting is carried out using bamboo sieves, which are divided into stockings of different specifications.
6 Pond adult fish breeding
6.1 After applying water to the base fertilizer pond, apply 250 kg of organic livestock manure per acre to cultivate the water quality. Organic manure manure should be decomposed by fermentation and sterilized with 1%-2% lime.
6.2 Stocking density is raised with high density. Each tilapia fingerling is prepared from 800 to 1,500 tails, and one foot is released at the same time. At the same time, 35 tail fishes of 4 to 5 inches are stocked on each acre, 40 fishes are reared, and 15 tails are 15 heavy-tailed turtles.
6.3 Feeding Management
6.3.1 feed full price with hard pellet feed, feed protein content of not less than 28%. Hard granules feed processing quality standards:
1) Hard pellet feed contains less than 3% of powder.
2) The diameter of hard pellets is 20% of the effective diameter of fish and the ratio of diameter to length is 1:1.5 to 2.0.
3) The feed requires no deterioration, good physical properties, and stable nutrient content.
4) The uniformity of feed processing and the granularity of feed ingredients meet the quality requirements for aquafeed processing.
5) Hard pellet feed has good stability and palatability. Tilapia prefers softer feeds.
6.3.2 Feeding amount is fed regularly and quantitatively according to weather, water temperature, dissolved oxygen and water quality. Feeding twice a day, 8 to 9 am, 5 to 6 pm, feed pellets, artificial feeding should be set in the pond to feed, the daily feeding amount according to the daily growth rate of deposits (reference The value of 1.2%) of the feed coefficient (taken the empirical value of 1.7), the next day the amount of feed fed by the day before the amount of 1.012, and so on.
6.3.3 Feeding methods Feeding by feeders can save 6 to 8% of feed compared to manual feeding, and the fish feeds evenly and the size of individual fish is uniform. Therefore, the promotion of feed machine feed hard pellet feed. Each pond is equipped with at least 1 feeder.
6.4 Water Quality Management Water quality management is one of the key technologies for high-yielding pond culture and healthy breeding. The main adjustment measures are as follows:
1) Water quality is kept live, cool and tender. Through the application of fertilizers, discharge water control, use of quicklime and other measures to adjust water quality to make the water transparency in the 25 ~ 35cm.
2) The pH is maintained at 7-8.0. Water quality can be adjusted using quicklime, organic fertilizer, chlorine preparations, etc. Using quicklime to control the pH of the pool water is very effective in the case of ponds in Maoming City that are mostly acidic. The lime aqueous solution is splashed once per month per mu, which is usually 7.5-15kg per mu per metre.
3) Dissolved oxygen is above 3mg/L for 24 hours and no less than 5mg/L for 16 hours. The main technical measures are: through fertilizing the water quality, controlling the suitable fertilizer for the pool water, using biological oxygen, regularly injecting new water to supplement the water-soluble oxygen in the pool, and preventing water quality from over-fertilizing and removing sludge to reduce the consumption of dissolved oxygen by the oxygen-consuming factor.
4) Aerators are equipped with: 0.3kW per mu, equipped with impeller type aerator. Under normal circumstances, start twice a day, from 12 noon to 2 noon, and from 2 to 4 in the morning.
5) Prevent the occurrence of "old water" and "turning water" phenomena. Mainly take the following measures: First, add new water in a timely manner or increase the oxygen aerator to prevent water quality deterioration; Second, throw lime, the amount of 25kg per mu, slush splash, add new water to the original water level; old water regulation Copper sulfate can be used for 2 to 3 days before adjusting with lime.
6.5 Develop a pool
1) The individual fish can grow up to the tail weight and can be sold out of the product fish.
2) Stop feeding the day before sale.
3) When selling, how much to sell, how much to round up, avoid rounding out too much damage to the fish.
7 Fish disease prevention and control of tilapia is susceptible to parasite or bacterial gill disease, ulcers and frostbite in pool water at low temperature. To prevent drastic changes in water temperature, oral administration of sulfa agents to prevent the use of antibiotics; high temperature pool culture will have ascites disease (blood distention disease), red fins desquamation. Vital lime 15ppm spill, oral antibiotic prophylaxis and treatment.

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Milking Machine with Stainless Steel Shelf for Cow

Portable cow milking machine is important equipments for today's dairy industry, it is widely used in small, medium and large farms. Also personal use is more and more common. Milking machine consists of vacuum pump, milk pulsator, electric motor, milk bucket etc.  And the motor could be used electric motor, diesel motor and gasoline motor.

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Operating Vacuum Degree

0.04-0.05MPa(adjustable)

Pulsation Times

60-80 times per minute

Pulsation Rate

60/40

Power Fitted

0.75KW-1.1KW

Gasoline Engine Standard KW Power and Rotating Speed

1.3/1.5/2.5/3.1/3.8/3600

Voltage

110V 220V 240V or 380V

The Number of Milking Cattle Per Hour

20-24 cows per hour

Motor Speed

1440 rpm per minute

The Number of Stainless Steel Milk Bucket

two(each of capacity of 25kg)




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