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Top 5 Chemicals for Mud Crab Recirculating Aquaculture Systems | Aquaculture Technology

Recirculating aquaculture systems are designed to recycle the amount of water used, and to ensure that the water is of good quality via a series of filtration systems. Proper usage of chemicals to ensure excellent water quality is paramount to the success of your recirculating aquaculture system. In this post, we will be touching on the top 5 chemicals that you will need to have in your farms running on recirculating aquaculture systems.

#01 Sea Salt or Treated Seawater

Mud crabs proliferate in brackish water environment, and your recirculating aquaculture systems need to replicate the environment in which your crabs are from. Maintaining proper salinity for the culture of mud crabs is important to ensure good growth of the crabs, more on the salinity here. There are a few options to obtain good quantities of brackish water. You can opt to make your own seawater by mixing high-quality sea-salt with the municipal water supply. Other options also include using treated seawater as a source of salinity, where you dilute the seawater to the required concentration. Quality of sea salt varies greatly between sources, and you should be careful in applying sea-salt with unknown origins. In many cases, biofilters are incorporated into recirculating aquaculture systems to bring down water or salt usage by treating the water, more on biofilters here.

#02 Sodium Thiosulphate

Operators that are planning to rely on the municipal water supply will need to remove the chlorine in the water. Chlorine removal is also needed for those who plan to disinfect their water with chlorine. The ideal anti-chlorine agent that are commonly used in recirculating aquaculture systems is sodium thiosulphate. While chlorine can be removed in several hours by the exposure to sunlight, it may take weeks for chloramines to completely break down. Hence, it might be more economical to use the relatively inexpensive sodium thiosulphate as an anti-chlorine agent. Residual chlorine in the recirculating aquaculture system will not only affect the mud crabs, but also impact the bacteria responsible for biofiltration.

#03 Sodium Bicarbonate