Fish cautious use of copper sulfate

Copper sulphate is commonly used to kill flagellates, ciliates, such as trichomonads, in fish. It can also be used to suppress excessive cyanobacteria and filamentous green algae in ponds and kill fungi and certain bacteria. However, the toxicity of copper sulfate is also more difficult to grasp. Because of its small safe concentration range, it should not be more than 0.7 g/m3 for freshwater fish under normal circumstances. 0.5 g/m3 of copper sulfate and 0.2 g/m3 of ferrous sulfate are commonly used in production. Not only improves the efficacy but also reduces the risk of poisoning. However, in production, many farmers were found to have the following problems: 1. For fear of trouble, only copper sulphate was used instead of ferrous sulphate, or ferrous sulphate was not understood. As a result, the use of copper sulphate has increased in concentration and increased in toxicity. When used in hot seasons, it is prone to fish poisoning. 2, do not look at the situation of the water, that the medicine is good for cure, blindly increase the amount of fish poisoning. 3, according to their own limited experience, while ignoring the temperature, water quality, fish disease species, blindly medication, resulting in poisoning.

Therefore, from the actual production point of view, the following points should be used in the use of copper sulfate: 1, no scale fish such as carp, catfish, etc., it is best not to use. Because these fish are sensitive to copper sulfate. 2, when the weather is hot and humid, it is best not to use, because at this time not only its toxicity is greater than usual, and the dissolved oxygen in the water is also low, the fish anti-toxicity is poor. 3. The thinner the water, the smaller the amount of copper sulfate. Because in the water with less organic matter, its toxicity is greater than that of organic matter. 4, when used to kill a large number of blue-green algae in the water body, can not be a lot of Quantang spill, should be less batch, multiple use. Otherwise, a large number of algae will die in a short period of time. After rot, they will seriously damage the water quality and even cause hypoxia or poisoning. 5. In the event of copper sulfate poisoning, the most direct and effective way is to add fresh water, which can dilute the concentration, but also play a role in oxygenation, which can effectively rescue poisoned fish.

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