Recirculating Aquaculture Breeding – Step One

From an environmental point of view, the limited amount of water used in the closed-circuit fishery system is useful, of course, as water has become a limited source in many areas. Also the limited use of water makes it much easier and cheaper to eliminate nutrients from fish. Because the volume of water discharged from a closed fish farming system is much lower than that of a traditional fish farm. Therefore, aquaculture can be considered as the most effective way to produce fish at a commercially viable level. Nutrients from farmed fish can be used as fertilizers in arable lands or as a base for biogas production.

The most interesting point is that the limited use of water in closed-circuit farming greatly benefits the in-farm fishery production. Traditional fish breeding is entirely dependent on external and environmental conditions such as river water temperature, water purity, oxygen level, or weeds and foliage, and blocking inbound meshes, and so on.

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Recirculating Aquaculture Breeding enables aquaculture to fully control all parameters in production, and aquaculture’s ability to operate the system is as important as its ability to care for fish.

Control parameters, such as water temperature, oxygen level or daylight for water, create stable and favorable conditions for the fish, which results in less stress and better growth. These stable conditions create a steady and predictable growth pattern that allows the farmer to predict exactly when the fish reaches a certain stage or size. The main advantage of this feature is that an accurate production schedule can be plotted and the exact time of fish for sale can be predicted. This benefits the overall management of the farm and enhances the ability to market fish in a competitive manner.

There are many benefits to using closed-circuit technology in fish farming, and the individual fishery intends to familiarize you with the various aspects of Recirculating Aquaculture Breeding. However, one important aspect to note is diseases. The impact of pathogenic factors on a rotating system as an invasive disease from the outside environment is significantly reduced by the limited use of water. Water for fish farming in a traditional system is drawn from a river, a lake or the sea, which naturally increases the risk of disease

Due to the limited use of water resources in the closed-circuit fish farming system, water is mainly drawn from a well, drainage system or spring where the risk of disease is minimal. In fact, many recirculation systems have no problems with the disease and therefore the use of the drug is significantly reduced for the benefit of the producer and the environment. To achieve this, it is very important for the fish farmer to be very careful about the eggs he brings to his farm. Many diseases are transmitted to the system using infected fish eggs or productive fish. The best way to prevent diseases that come in this way is to bring fish and even fish eggs from reputable centers, as they can give you confidence in the disease.

Aquaculture requires knowledge, good management, patience and sometimes nerves of steel. Switching from the traditional fish farming to the Recirculating Aquaculture System makes things a lot easier, though it requires new and more skills. Get in touch with experts and experts in this field to succeed in this advanced aquaculture system and use up-to-date knowledge.

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In a closed-circuit system, it is necessary to continuously purify the water to dispose of waste products that are excreted by the fish and hold the dissolved oxygen high to keep the fish alive and healthy. A closed fish farming system is actually very simple. From the outlet of the fish tanks, the water flows to a mechanical filter and before returning to the fish tanks, carbon dioxide must be removed and the water transferred to a biological filter after increasing dissolved oxygen. This is the basic principle of a recirculating aquaculture system.

Also many other features can be added, such as: Increased dissolved oxygen with pure oxygen, ultraviolet light or disinfection with ozone technology, automatic pH adjustment, heat exchange, nitrate dehydration and more…

Fish in a fish farm needs to be fed several times a day. Food is eaten and digested by fish and used in fish metabolism, which provides energy and nutrition for growth and other physiological processes. The soluble oxygen enters the fish’s body through the gills and is needed to generate energy and break down the protein, whereby carbon dioxide and ammonia are produced as waste products.

Solids (tss) and organic matter, carbon dioxide and ammonia enter the water from the gills. Therefore, the fish consume oxygen and feed, and as a result, the water in the system is contaminated with feces, carbon dioxide and ammonia.

Note: Only dry food can be recommended for recycling. Use of junk fish in any way should be avoided as it infects the system and infection with diseases is very likely. The use of dry feed is safe and has the advantage of being designed to meet the exact biological needs of fish. Dry food of different sizes is suitable for each stage of fish production.

Behruz Alinia Fard
Fisheries Analyst and Complicator

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