If the fish pond is small, you can choose goldfish, which is also a low-temperature tolerant fish species and has strong adaptability to the environment.
When using fish ponds to raise fish, we should pay attention to the following matters to improve the control effect:
1. Accurately judge whether the disease is caused by water quality or bacteria, so as to determine the type of medication. If the water quality deteriorates, water quality improvement drugs should be applied or water should be changed first. If pesticides are used first, it will aggravate the pollution and deterioration of water quality and further aggravate the illness of fish.
2. The dosage of some drugs should also be increased or decreased according to the physical and chemical factors such as the fatness, PH value and water temperature of the pool water, and even decide whether to switch to other drugs.
3, some drugs (such as bleaching powder, ferrous sulfate) residue don't pour into the pond.
4. When the temperature is high in summer, the watering time should be in the morning or evening. At this time, the water temperature is low, and the drug reaction is stable, while the drug is used at noon in spring and autumn when the temperature is low.
5, according to the control object, choose different time to use drugs, such as killing Lepidoptera Xenopus laevis larvae and crayfish, because they like to gather on the surface of the pool water in the morning or evening, and the drug effect is better at this time.
6. If the pool water is deep, drain 20%-30% of the pool water first, and then use the medicine or use it in batches or at intervals of more than 2 hours, so as to avoid the high concentration of the upper water and cause phytotoxicity.
7. Some drugs will kill plankton, make the water quality worse, and lead to lack of oxygen in the pool water.
Therefore, when using algae-killing drugs, half of the pond should be used on the first day, and the remaining half of the pond should be used the next day. For ponds with too much fertilizer and water, it is best to use pesticides twice, with an interval of more than 2 hours, so as to avoid sudden and massive death of plankton in the pond, which will worsen the water quality of the pond and cause flooding.