Types of aquaculture

Several aquaculture practices are applied worldwide. There are indeed several types of aquaculture:
  • extensive or intensive
  • in a natural environment or in a pond
  • in fresh or salt water
  • in circulation or recirculation systems
If these practices allow a great diversity of breeding organisms, they require specific techniques and equipment.

Aquaculture Engineering

On leaving the fish pond, the water first flows through a mechanical filter to eliminate the organic waste it contains. The finest particles and dissolved compounds such as phosphate then pass through the mechanical filter.

That’s why the water goes to a biological filter, to break down organic matter and ammonia. All this, before being aerated and cleaned of carbon dioxide and returned to the aquariums.

This is the biological process carried out by bacteria in the bio filter.

  1. FISH FARMING PONDS: In the water, fish feed and produce faeces, rich in ammonia.
  2. MECHANICAL FILTRATION : The particulate and dissolved waste contained in the water in the rearing tanks is eliminated through a drum filter.
  3. WATER BUFFER TANK : The water is channelled into a first intermediate storage tank, the water line buffer tank..
  4. UV DISINFECTION : An ultra-violet treatment destroys the bacteria and viruses contained in the water from the breeding ponds.
  5. BIOLOGICAL FILTRATION: A biological filter supports specific bacteria that convert ammonia into non-toxic nitrate.
Aquaculture

Recirculating aquaculture (RAS)

In a recirculating aquaculture system, the culture water is continuously purified and reused. Indeed, a recirculating aquaculture system is practically a closed circuit.

  • The waste products produced; solid waste, ammonium and CO2, are either removed or converted to non-toxic products by the system components.
  • The purified water is then saturated with oxygen and returned to the aquariums.
  • By recirculating crop water, water and energy requirements are kept to an absolute minimum. However, it is not possible to design a completely closed recirculation system.
  • Non-degradable waste must be disposed of and evaporated water replaced.

Nevertheless, our recirculating systems are capable of reusing 90% or more of the crop water. To ensure proper water purification, we equip recirculation systems with a number of components with specific functions.

The benefits of farming in RAS are:

  • Fully controlled environment for fish
  • Low water consumption
  • Efficient energy use
  • Efficient land use
  • Optimum feeding strategy
  • Easy grading and harvesting of fish
  • Total control of disease
  • Recirculating aquaculture systems constraints

The growing aquaculture recirculation systems are the best option for sites close to or in cities, with good availability of electricity. Furthermore, the use of RAS technology is the only possibility for rearing tropical fish species in moderate to cold indoor climates.

1H2O3 aquaculture supplies

The technique of 1H203 allows to realize several modelling of system to realize aquaculture techniques whatever its type. Actually, the assembly for aquaculture uses MBBR technology. This requires 8 boxes connected to each other as follows:

  1. STORAGE BOX (BUFFER TANK) : Intermediate water storage box
  2. THE MOTOR BOX : Obligatory box for the functioning of the aquaponicssystem. It has an aerator, UV disinfection and a feed pump for the system.
  3. MBBR BOX : Biological denitrification filter (biofilter)
  4. BOX MBBR : Biological nitrification filter (biofilter)
  5. STORAGE BOX (BUFFER POND)
  6. FISH TANK with a nitrogen gas degassing system
  7. DRUM FILTER BOX: Filter technology box for water purification
  8. COLLECTION/DECANTATION BOX (STORAGE OF SLUDGE AND SEPARATION): Collects treated water to supply the ponds. It is also used for settling and storing sludge.
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