New technology of clearing pond and removing wild land

At present, the commonly used pond cleaning drugs are quicklime, tea meal, bleach, bleach, trichloroisocyanuric acid and so on.

1. Quicklime clear pond quicklime (CaO) produces strongly alkaline calcium hydroxide when exposed to water, which makes the pH (pH) of the pond water rise sharply to 11: 12, so it can kill wild fishes, enemy organisms and various pathogens.

two。 Tea meal Qingtang tea meal is a round cake made from the remaining residue of Camellia oleifera seeds after pressing oil. Usage: beat the tea meal into small pieces, soak it in water and soak it at a water temperature of about 25 ℃ for one day and night. Add water when applying, sprinkle evenly on the whole pond, the water depth of 20 cm per mu of pond is 13 kg, the water depth of 1 meter is 35-45 kg. The above dosage can be increased or decreased depending on the species of wild miscellaneous fish in the pond. For fish that cannot drill mud, they can be used less and vice versa.

3. Bleaching powder, bleaching essence, trichloroisocyanuric acid pond cleaning they all decompose in the presence of water, releasing hypochloric acid, which immediately releases primary ecological oxygen, which has a strong role in sterilizing and killing enemy organisms. Bleach usually contains about 30% of available chlorine (this refers to the percentage of chlorine with disinfection ability to the total), bleach is pure hypochloric acid, contains 60% available chlorine, 70% available chlorine, trichloroisocyanuric acid contains 85% available chlorine 90%.

Usage: first calculate the pool water volume, 20 grams of bleach per cubic meter of water, the amount of bleaching essence is 1 / 2 of bleach, and the amount of trichloroisocyanuric acid is 1 / 3 of the amount of bleach. After dissolving them with water, immediately sprinkle them all over the pool. The technical key of bleaching powder cleaning pond is to prevent it from absorbing water and dissolving. As soon as the bleach was dissolved, the content of available chlorine decreased greatly, which affected the effect of pond cleaning. The bleaching essence is stable, and trichloroisocyanuric acid is the most stable. if it is stored open for half a year, the loss of available chlorine is less than 10%. Water disinfectant produced by Wuxi Huanowi Animal Health products Co., Ltd. makes use of drug synergistic technology to maximize the release of trichloroisocyanuric acid activity, and the disinfection effect of clearing ponds is very good.

It usually takes 7 to 10 days to clear the pond with the above-mentioned drugs, and the medicine disappears before the crab seedlings can be released. Bleach drugs disappear quickly, usually 5 days after clearing the pond can be released shrimp and crab seedlings.

The above several kinds of pond cleaning drugs have their own advantages and disadvantages. Tea meal can kill fish, aquatic insects, frog eggs, tadpoles, snails, leeches, etc.; quicklime, bleaching powder, bleach essence and trichloroisocyanuric acid can not only kill the above enemy organisms, but also kill aquatic plants, filamentous algae, parasites and pathogenic bacteria. Quicklime can also maintain the stability of pH in water, release nitrogen, phosphorus, potassium and other nutrients adsorbed by sludge, and improve water quality. It must be emphasized that the saline-alkali fish ponds have high alkalinity and high pH, so quicklime with strong alkalinity should not be used as pond cleaning medicine, but bleaching powder should be selected. In addition, tea meal has a strong destructive effect on the blood of fish, while the sensitivity of crustaceans such as crab and shrimp to tea meal toxin is 50 times lower than that of fish. Therefore, tea meal is usually used to clear the pond, the dose of the drug can only kill fish and other animals, but shrimp and crabs do not work, so tea meal cleaning pond has more and more crab shrimp.

In the case of the introduction of several conventional pond cleaning drugs mentioned above, several new technologies are specially provided for reference by farmers of different breeding objects:

1. Bromoacetamide is a white crystalline powder, easily soluble in water and ethanol, water solubility 42 grams at 25 ℃, easy to absorb moisture, is one of the drugs recommended by the World Health Organization, the molluscicidal concentration is 0.5-0.8 mg / L, the molluscicidal mortality is 96.7% and 100%, and the molluscicidal egg concentration is 0.34g / L.

The effect on fry and fingerling of silver carp and carp was much smaller than that of snail clam. Under the condition of water temperature 18.5-26 ℃, Lc509.4~9.8 mg / L in 72 hours was 9.5-11.3 mg / L in grass carp fry. The general concentration is 6 mg / L, and the fish is safe and sound. Fish and shrimp can be put in 10 days. This product has been widely used in Pengze, Tianfeng, Xifeng, Anhui, Fujian and other areas of Jiangxi.

two。 Niclosamide is approved by the World Health Organization for snail control. Because it is insoluble in water, the ethanolamine salt is soluble in water, the molluscicidal concentration of 0.3 mg / L can cause death, and can also be used to kill adult tapeworm. In order to strengthen the effect of this agent, using this compound rotenone powder can kill all snails, fish and shrimp, and release fish after 15 days.

3. Rotenone (Rotenone) this product has 7.5% powder and 2.5%, 7% EC, its dosage is 0.3-0.4 mg / L, it can kill fish fry, but it should be avoided when shrimp and crab shelling, so as not to cause death.

4. Shamindan, also known as Paidan, is synthesized with biological silkworm venom. The product has 98% soluble powder, 0.15 mg / L 0.21 mg / L can kill snails, 0.25 mg / L 0.3 mg / L can kill domestic fish species, generally, big fish die first, small fish die later, and water can not be changed or injected during use, otherwise they will be revived.

Wuxi Huanuowei Animal Health products Co., Ltd. combines the above technologies and uses the compound technology to make an environmentally friendly pond cleaning agent "Qingtang Ling". On the one hand, it can be used as a pond cleaning agent before shrimp and crab culture, and it can also kill fish in the process of culture; on the other hand, it can also promote shrimp and crab molting and stimulate the growth of shrimp and crabs. In the process of use, all localities should increase or decrease the dosage according to the actual culture.