Indonesia is one of the biggest seafood producers in the world, enriched with fish-rich waters, a long fishing tradition, and lived by more than 200 millions people that are also major seafood consumers. Both domestic demand and export potential bring a business opportunities for fish, shrimp, shellfish, and seaweed producers. However, like other farming sectors, the likelihood of major disease problems occuring increases as aquaculture activities intensify and expand. Disease is now a primary constraint to the culture of many aquatic species, impeding both economic and social development.

Bacterial and viral diseases create serious problems in semi-intensive and intensive aquaculture. Use of surface water in flow-through systems represents a risk of contamination by introducing waterborne fish pathogenic microorganisms. Such contamination results in heavy losses in aquaculture worldwide, and has also limited the progress in commercial farming of new aquacultural species. Some commercial operations may be required to disinfect their discharge waters before release into the aquatic environment. Therefore, disinfection toward viruses, bacteria, fungi, parasites and other undiagnosed and emerging pathogens, is highly needed to guarantee consistent qualified seafood supply.

Disinfection by ozonation or UV-irradiation are two methods often applied in aquaculture with their own advantages and disadvantages. Triotirta is supported by two world leader principal both for Ozone technology (BWT, Germany) or UV technology (Aquafine, US). Therefore, contact TriotirtaCare to discuss your disinfection needs that will fit your aquaculture system well. Click here to see our clients in aquaculture

Ozone has been used in a range of aquaculture applications related to disinfection and improving water quality. Ozone has been widely used in aquaculture because it is a powerful oxidizing agent that has a rapid reaction rate and few harmful reaction products.

Ozone is oftenly used in aquaculture for disinfection purpose, both in single pass flow through water and more in recirculated water system as in this recirculated water system, homogeneous fish stock leads to a high risk of infections and problems with bacteria, fungi, and viruses. Microbial reductions may be desired to minimize the risk of pathogens introduced into aquaculture systems through the water supply, prevent the spread of pathogens carried in the effluent from aquaculture facilities, and suppress the general microflora within recirculating systems.

Besides disinfection, ozone water treatment could help improve water quality because of its oxidizing agent capacity. Many contaminants found in water used for aquaculture are easily oxidized, therefore ozone can be used in water quality control applications ranging from removal of solids to reductions in nitrite and nonbiodegradable organic molecules. In brief, below are reasons why ozone use is growing in aquaculture:

  • It effectively removes organics, pesticides, discoloration, and nitrates.
  • Ozone has rapid reaction rate and unconsumed ozone typically reverts back to oxygen, leaving no harmful residuals behind.
  • Ozone oxidizes long chain molecules, which are unaffected by biofiltration.
  • Ozone involves far lower risk of accidental pollution in comparison to other water treatment methods.
  • Oimproves the effectiveness of biological and particulate filtration through micro flocculation of fine and colloidal solids and precipitation of dissolved organic compounds.

This is How BWT Ozone Water Treatment System Works in Your Aquaculture Water System:


Ozone and Cold Storage Helps Extending Aquaculture Products’ Shelf Life

All food products especially fish, shrimp, and other seafood products are highly degradable because it provides rich nutrients to microbes. At low temperatures, bacterial activity is slowed down that causes bacteria to be inactivated, but not destroyed. Controlling or destroying these bacteria helps in maintaining the foods fresher for far longer. Using disinfectants helps in controlling the bacterial activity, but the disinfectant used should not become a part of the food when consumed. Ozone has been approved by USDA and FDA as an antimicrobial agent for use with food processing and brings advantage in such cold storage rooms for better maintenance of stored foods. Research shows that combination of ozone treatment and cold storage (at 4°C) will increase the fish and seafood shelf life considerably.

Advantages of using Ozone for Cold Storage

  • Ozone increases the shelf life of fish and other food products.
  • Ozone treatment results in lower counts of bacteria.
  • Ozone treatment results in higher protein number of the fish.
  • Ozone has no negative impact of fish nutritional properties.
  • Ozone doesn’t change fish color & flavor.
  • Ozone leaves no residue on the fish.

(source: World Academy of Science, Engineering and Technology Vol:4 2010-02-28)

Methods of Ozone Application for Disinfection

  • Ozone dissolved in the rinsing water to wash seafood, meat, vegetable, and fruits.
  • Low level ozone gas can be distributed throughout the cold storage room.
  • Ozone-sterilized ice is used to pack fresh fish and seafood to prolong freshness.

This is the most common application of UV in water treatment. A fish hatchery could have several locations where UV equipment would be installed. Typically UV systems are installed after all other water treatment technologies used to enhance water quality (i.e. filters, degasifiers, etc.) just prior to the water contacting fish eggs in an incubation facility or fish in a rearing facility. Additionally, UV systems can be used in hatchery recycle loops and in the effluent treatment system which is becoming more common in some regions.

UV systems significantly reduce pathogen counts in incubation and rearing facilities and have proven to be the most cost effective disinfection technology for the inactivation of many types of bacteria, viruses and parasites harmful to many species of fish.