Pond conditions
The area of ​​shrimp culture ponds is generally 2 mu - 10 mu and the water depth is 1.0 - 1.5 meters. The silt at the bottom of the pool is no more than 15 cm, and the slope ratio of the pond is about 1: (2.0-3.0). The traffic is convenient and the sun is abundant. Adequate water supply, fresh water, no pollution, easy access to water, and separate water inlet and outlet. In the water inlet of the shrimp pond, 40 mesh and 60 mesh screen meshes are used to filter the influent water to prevent intrusion of small trash fish and predator organisms. The drain was stopped with a 40 mesh nylon mesh or wire mesh to prevent the shrimp from escaping.
Pond disinfection
"One spring" Exposure ponds in the middle and early January, with 100kg to 150kg of lime per acre or 10kg of bleached clear pond to disinfect. In February, water injection is 50cm. When the water is injected, it is filtered through a 40-mesh screen. The "second-half of autumn" is the first half of July and the last half of July is filled with 50cm of water. It is disinfected with 10kg of bleaching powder.
Planting plants
Two and a half months after disinfection, clear ponds were planted with aquatic plants such as peanuts in the shallow water area 1 meter from the edge of the pond along the shrimp ponds, and submerged plants such as Hydrilla verticillata and Vallisneria in the bottom of the pond. Aquatic plants should not be overgrown. The planting area accounts for about 20%-30% of the shrimp pond area. If too much planting, one easy to make the shrimp pond water quality is too thin, affecting the normal growth of the shrimp; two in the hot season due to death of water plants rot, can easily lead to deterioration of the pond water quality and pan.
Introducing quality shrimp
In order to prevent the degradation of the green shrimp species, freshwater shrimp seedlings need to be renewed every 2 aquaculture years for purification and rejuvenation. One source of shrimp species is the introduction of "Taihu No. 1" green shrimp parent from Jiangsu; the second is the collection of wild shrimp species from Fuchunjiang.
Shrimp species stocking
Water quality fertilization
Before the stocking, clear the clear pond water, fill it with water 50 centimeters to 70 centimeters, use rotten organic fertilizer 100 kilograms per kilogram to 150 kilograms, can also use the compound fertilizer 3 kilograms - 5 kilograms fertilize the water quality, provides the palatable naturalness for the shrimp species, the shrimp seedlings Food.
Seed stocking
The "Spring" shrimp stocking time is mid-February, with a specification of 1,500 to 2000 tails/kg, acre stocking capacity of 10 kg to 15 kg, and a "two-season" shrimp stocking time from mid-July to early August. , Specifications 4000 - 6000 tails / kg, acre stocking 50,000-60,000. Shrimp seedlings should be stocked on a cloudy or rainy day. If it is sunny, it should be done in the morning and night to avoid direct sunlight and affect the survival rate. Shrimp seedlings require one foot at a time. In addition, 20 mussels and 30 mussels can be planted per mu of shrimp ponds, with specifications ranging from 6 to 10/kg. The stocking of calyx fingerlings must be conducted 10 to 15 days after stocking.
Feeding
Feedstuffs are selected for the cultivation of feed for shrimps. Feed crude protein content 28% -38%. The average individual length of the shrimp seedlings is less than or equal to 2.5 cm/tail culture period. The feedstuffs are prepared from young prawns with a crude protein content of 36% to 38%. The individual average length of the prawns is >2.5 cm/tail. 28% -32% of shrimp farming feed. The daily dose is generally controlled at 3%-5% of the total body weight of shrimps. Every day at 8 am and 5-6 pm, they are fed one at a time. The morning accounted for 1/3 of the daily feeding amount, and accounted for 2/3 in the afternoon. The specific feed intake depends on the weather, water quality, water temperature, and shrimp eating conditions. It is usually appropriate to eat from 1.5 hours to 2 hours. To facilitate inspections, a food counter can be set up around the shrimp ponds to check their food intake.
Water quality management
Green shrimp require higher water quality, and shrimp pond water quality should be maintained at 30 cm to 40 cm. Water quality management should be:
Timely change of water
Shrimp ponds usually fill fresh water every half month to a month, and fresh water is added regularly every 5 days to 7 days in the hot season from July to September. The general water change is 20 cm - 30 cm to improve water quality. It is also necessary to adjust the water level according to the season and temperature to maintain a suitable water temperature. Spring water depth is 50 cm - 60 cm, in order to facilitate warming; winter water depth to maintain more than 1 meter to keep warm for winter; other seasons water depth is 80 cm -100 cm.
Adjust water quality
Water quality should be periodically splashed with microbiological preparations, and commonly used are live water treasures, EM original exposure, etc. to rapidly reduce ammonia nitrogen, nitrite and other contents in shrimp ponds, efficiently decompose aquatic animal excreta, inhibit the growth of harmful bacteria, improve water quality, Purify water quality.
Mechanical oxygenation
According to the weather and the activities of the shrimp, the oxygenation machine will be set to open at regular intervals. It will open at noon on sunny days and open in the early morning on cloudy days. It will open in the middle of the night on rainy days. If the floating head is found, it should be turned on as soon as possible. From July to September, oxygen should be turned on for more than 2 hours at noon or in the early morning.
Shrimp disease prevention
Shrimp disease prevention
In order to ensure normal healthy growth of shrimp, water disinfection is performed every 15 days to 20 days with disinfectants such as chlorine dioxide or dibromohydantoin or povidone-iodine; and florfenicol is used every month during the high-temperature season from July to September. , multi-dimensional and other mixed bait feeding, each 3 days -5 days, to prevent the occurrence of disease.
Shrimp treatment
Once the shrimp in the pond is found to be sick, diagnose the disease immediately and accurately, and then treat the disease promptly, and the disease will be treated as green rot disease, enteritis, red leg disease, florfenicol, enrofloxacin, simultaneous addition of multidimensional, allicin, etc. Mix feed, feed for 5 days to 7 days, and sterilize the body with iodine or other disinfectants for 2 days to 3 days. Ciliate disease fibrils g Quanchiposa, 5 days -7 days before use.
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