Growing public demand for a healthy, tasty and affordable fish is stimulating the "boom" in this industry.
The decline in wild fish populations as a result of overharvest and water pollution has promoted the culture
of farm-fresh that are grown in contaminant-free waters.
Disinfection methods like chlorination and liming employed in such aquaculture methods or fish hatcheries do not guarantee complete disinfection as chlorine is not effective against all kinds of pathogen. Since the harvest is directly sold to the markets, the health condition of the fish should be treated with utmost concern.
Due to improper disinfection, various microorganisms or fish pathogens like Aeromonas salmonicida, Vibrio anguillarum and V. salmonicida, un-oxidized ammonia from the fishes’ excreta etc affect the fish stock in ways like improper growth, genetic disorders in the incubation and hatching period, weight loss, poor taste, high death rate, fish diseases etc; indirectly causing economic and production losses. Also, residual chlorine and DBPs (Disinfection By-Product) formed by chlorine; like THMs (Trihalomethane), HAAs (Haloacetic acid) etc which are carcinogenic in nature; are highly toxic for aquatic animals. High nutrient levels lead to the bloom of cyanobacteria / blue green algae in the ponds which are toxic to the aquatic life. Also decomposed cyanobacteria floats on the surface and blocks the light; reducing the dissolved oxygen. It is obvious that when the fish density per cubic meter is raised the risk of infection increases proportionally. In order to maintain the survival rate as high as possible; it is of vital importance to ensure that no water borne disease can enter the system which applies to circulating systems as well as once through arrangements.
To execute this, ozone disinfection is the most preferred treatment. Unlike agents as chlorine, or any of its derivatives, oxidation with ozone leaves no toxic residues requiring further complex treatment. In practice, ozone immediately starts to attack the oxidizable components it comes in contact with; and this property makes it a very powerful disinfectant. Because the process only leaves "oxygenated" products and oxygen, it is particularly well suited for applications such as hatchery water where the presence of undesirable elements after treatment could have grave consequences.
Because it is such a strong oxidant, Ozone not only produces extremely clear water, it also ensures that water quality parameters are within the desired range by oxidizing organics, controlling bacteria and minimizing or eliminating chloramine formation. Ozone has had a role in aquarium water treatment since the 1960’s and is now the disinfectant of choice for aquarium facilities. Unlike most water treatment applications, large aquarium exhibits need to preserve the many living organisms in the water and keeping marine life exhibits both beautiful and healthy presents a unique challenge. Organic and inorganic contaminants can accumulate very rapidly posing a danger to the animals and detracting from the appearance of the exhibit. Therefore, exhibit waters must be continually recycled through a life support system (LSS) to protect the animals in the exhibit and maintain adequate water quality.
Ozone is the most effective and efficient disinfectant that can be employed and has been utilized as the primary disinfectant in multi-species marine and freshwater systems since the 1960’s. It is such a strong oxidant that it not only produces extremely clear water, but it also ensures that water quality parameters are within the desired range by oxidizing organics, controlling bacteria and minimizing or eliminating chloramine formation.