Fish pond spilled drugs attention points
In recent years, with the increase of fishery production, the amount of feeds has increased, the aquaculture waters have been seriously polluted by the outside world, the penetration and flow of fertilizers used in farmland, and the complex composition of substances in the aquaculture waters have made it difficult to increase the accuracy of fishpond applications. The use of drugs is not effective, even after the use of drugs, it will intensify the death of fish. Therefore, in order to increase the control effect, the following items should be noted in addition to the requirements for use of fish medicines in Quanchiposa:
1. Accurately determine if the illness is caused by water quality or caused by pathogens to determine the type of drug. If water quality deteriorates, the first thing to do is to use improved water quality drugs or change the water. If you use insecticidal and bactericidal drugs first, it will aggravate water pollution and Deterioration worsens fish conditions.
2. The dosage of certain drugs (such as copper sulphate) should also be increased or decreased according to the actual conditions of physical and chemical factors such as the fatness, PH value and water temperature of the pool water, and even whether to use other drugs.
3. The residue of certain drugs (such as floating white powder and ferrous sulfate) should not be poured into the pond to prevent the fish from eating and causing toxic death.
4. During high temperatures in summer, the spraying time should be carried out in the morning or evening. At this time, the water temperature is low, and the drug reaction is relatively stable. In spring and autumn, when the temperature is lower, medication should be taken at noon.
5, according to the control of the target to choose different time medication. Such as killing anchor larvae and crawfish (enemy), because they like to gather in the pool surface water, pool side in the morning or evening, this time the effect is better.
6. If the pool water is relatively deep, first drain 20%-30% of the pool water and then use the medicine or sub- or second-time medication. The interval time is more than 2 hours to avoid the upper water concentration being too large and causing phytotoxicity.
7. Some drugs will kill plankton, thereby worsening water quality, leading to lack of oxygen in pool water. Therefore, when using a miscellaneous algae drug, half a pond is used on the first day and the remaining half pond is used on the second day. For ponds that are over-fertilized, it is best to use bactericidal drugs that are divided into secondary drugs. The interval time is more than 2 hours, so as to avoid a sudden and massive death of plankton in the pool, so as to make the pool water worsen and cause flooding.
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