Matters needing attention in the use of quicklime in ricefield eel pond

In rice field eel culture, the general concentration is 25ppm (25 grams per cubic meter of water). The method used in eel ponds is to weigh the corresponding weight of quicklime, add it to the water (such as a plastic bucket containing water), stir it with a tool to fully dissolve it, leave it for a little while to clarify, and sprinkle the clear liquid on it. The chemical name of quicklime is calcium oxide (CaO), because it is cheap and rich in production. when dissolved in water, it will have a chemical reaction with water to produce a large amount of alkaline substance (calcium hydroxide), which increases the pH of water, thus inhibiting or killing bacteria, which is widely used in aquaculture.

It should be noted that the dosage of quicklime is relatively strict and can not be expanded arbitrarily, otherwise it may bring harm to the ricefield eel in the pond. Professor Kuan and others have conducted experiments on this, and the situation is that when the rice field eel is released into quicklime water with a concentration of 50ppm, the rice field eel immediately becomes restless and jumps to the surface, a phenomenon that continues until death. There are more flocs in the experimental water, which is the product of the interaction between the surface mucus of ricefield eel and quicklime. All dead ricefield eels secrete a large amount of mucus, red and swollen anus, patchy or massive erythema in the neck, hyperemia in the head, congestion in the parotid cavity and blood clots filled with blood clots. Changing into clean water for about 2 hours can not stop the death. In the experimental group with slightly lower concentration of quicklime, the mortality of Monopterus Albus decreased significantly within 5 hours and 24 hours, but the cumulative mortality increased with the extension of time. In the experimental group treated with 50ppm concentration, the mortality rate reached 100% in 7 days. Therefore, when using quicklime as a disinfection drug, the amount of water must be accurately calculated and weighed accurately, and its maximum concentration should not exceed 30ppm.

Note: after using quicklime to disinfect the pond or eel pond, the medicine must be fully eliminated before it can be used, otherwise it will affect the survival rate of Monopterus Albus. This is a problem that must be paid attention to in the use of quicklime in Monopterus Albus culture.