What are the disinfection methods for crayfish farming ponds? A detailed explanation

Although the vast majority of large-scale farms now have fairly complete biosecurity systems and hygienic and epidemic prevention measures, when it comes to the disinfection pond specifically, conditions vary from farm to farm. The two commonly used methods for disinfecting crayfish farming ponds are quicklime disinfection and bleaching powder disinfection. Let's take a look below!

Quicklime disinfection

Before using quicklime for disinfection, leave only 5-10 cm of standing water in the pond. Break up the quicklime and sprinkle it evenly into the pond water to dissolve. The usual amount of quicklime is 20-40 kg per mu. On the second day after applying quicklime, stir the pond bottom with an iron rake so that the lime slurry and silt are thoroughly mixed. Since quicklime contains more than 50% calcium (theoretical value: 71.4%), and crayfish molt during growth and must take in sufficient calcium, quicklime is also inexpensive.

Bleaching powder disinfection

Using bleaching powder to disinfect a crayfish farming pond requires draining the pond water. Use 0.5-1 kg of bleaching powder with an effective chlorine content of more than 30% per mu. For ponds that have not been drained, use 1.5-2.5 kg of bleaching powder with an effective chlorine content of more than 30% per mu per 1 m of water depth. When using it, first put the bleaching powder into a wooden basin or iron bucket, add water to dilute it, and splash it over the pond. Do not release the disinfected water; keep it in the pond. Start adding water the next day until the water level meets the rearing requirements.

Caustic soda disinfection

Many crayfish farms now commonly use caustic soda to disinfect ponds, but caustic soda does not act quickly, is ineffective against many viruses, is corrosive, and readily reacts with carbon dioxide and becomes ineffective. At the same time, caustic soda can burn the skin and organs, so personnel carrying out disinfection operations must protect themselves to avoid skin burns.