Mixed breed crab shrimp how to safely summer

Summer is the season when river crabs and shrimp grow. It is also a season when the weather is changeable and water quality is easy to change. It is prone to outbreaks. To make crabs and shrimps safe in the summer, we should do a good job in the following tasks:

Adjust water quality

The transparency of crab and shrimp mixed ponds is controlled at a depth of 50 to 60 cm, a pH of 7 to 8, a dissolved oxygen of 4 mg or more, and a nitrite content of less than 0.02 mg per liter.

Changing the water The frequency, time, and volume of water changes in the summer are mainly based on water quality and weather conditions. Usually, the water is changed every 7 to 10 days, and the water is changed by about 20% each time.

Lime and superphosphate are applied in summer for 10 to 15 days. Once quick lime is applied, 10 to 15 grams per cubic meter is applied. After application of quick lime, calcium superphosphate is applied at 2 to 2.5 kilograms per acre for 3 to 4 days. 1 or 2 times, it can prevent the lack of phosphorus in the pool water and promote the growth of river crabs and shrimps.

Regular use of biological agents in the summer to regularly use biological agents (such as EM bacteria, super-concentrated complex Bacillus) to regulate water quality, combined with oral administration, can avoid the use of disinfectants on the damage of the shrimp. The EM bacterium is used once every 10 to 15 days, and 250 g is used at a depth of 1 meter per acre. After heavy rain or windy weather, the water body is turbid and the transparency is reduced. Super-concentrated composite bacillus can be used to promote the sinking of suspended matter, decompose organic matter in the bottom layer of pool water, improve the transparency of pool water, and improve water quality and sediment quality.

Timely opening of aerators Green prawns require higher dissolved oxygen. Crabs also like fresh water with high dissolved oxygen in water, so they must be equipped with aeration equipment. The principle of opening the aerator is: open at noon on a sunny day, open in the early morning on cloudy days, open in the middle of a rainy night, open late in the evening, open early in the floating head, open without wind, open with less wind, open more at high temperatures, and open at low temperatures.

Control the area of ​​aquatic plants

In summer, the sunlight is strong and the aquatic plants grow vigorously. If the water grass covers an area that is too large, the water quality will be deteriorated and the pool water will be deprived of oxygen. It is advisable to cut away the excess weeds and the area of ​​the aquatic plants is controlled at 40% to 50% of the pond area.

Reasonable feeding

Green prawns are mainly fed with compound feeds, focusing on the part of the oyster shell with some of the minced fish. Feeding time of shrimp: Every day from 7 to 8 o'clock in the morning, 5 to 6 o'clock in the afternoon, 30% of daily feeding amount is put in the morning and 70% is put in the afternoon. In the morning, the bait is evenly thrown in the deeper water area around the pool, and it is put on the coast in the afternoon. Shallow water.

Timely reduction of shrimp density

In the ponds where the main crabs are raised, the shrimps are mixed. The shrimps that are bred by the egg-bearing shrimps are all about 3 cm long. According to the density of the shrimps, the cages or dip nets can be used to catch large-size shrimps and the shrimps can be adjusted. Density reduces total biomass in the tank.

Clean up wild fish

Wild miscellaneous fish compete with crabs and shrimps in the pool to compete for space and compete for oxygen. To reduce the production cost and increase the specifications of crabs and shrimps, it is necessary to control and clean wild miscellaneous fish. Normally, pond water is filtered with a 60-mesh net.

Disease prevention measures

In July-August, according to pond water quality, weather, etc., avoid the use of insecticides at the peak of crab and shrimp clams.

In continuous rainy weather, pay attention to disease prevention, and use Quanchiposa and oral administration methods.

In the middle and late August, shrimp and crab enteritis should be prevented. Garlic seeds (garlic mash, do not boil) should be mixed with baits once a day for 3 days.

The use of disinfectants for the control of other bacterial and viral diseases, such as dibromohydantoin, disinfectant bodies.

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