Dantek and Fisheris

Aquatic health, more growth, more density and less water, all together with nanobubbles

Dantek and Fisheris

All living creatures need oxygen in different ways to provide energy for growth, reproduction, and metabolism. Having the right amount of oxygen in water is of great importance for various industries, including the aquatic industry. Oxygen consumers in aquaculture ponds are bacteria in the water, microorganisms and fish. Lack of water-soluble oxygen is a major cause of fish mortality. Therefore, regular and stable oxygen supply in the field of aquaculture is of special importance. Low levels of DO in aquatic water lead to disease and fungal infections. In addition, in hot seasons, the water temperature increases and therefore less oxygen can be stored in it than in low temperature waters. This makes it common for fish to die in the warmer months of the year due to a lack of oxygen in the water. Also, increasing the salinity of water leads to a decrease in the ability to store oxygen in water. On the other hand, oxygen consumption in fish increases significantly during food consumption time and after that. When it is not possible to provide the required amount of oxygen at the time of feeding, the breeder minimizes the amount of feeding, which disrupts the growth period of the fish. Ammonia is one of the major nitrogen compounds excreted from most fish, which combines easily with water to form ammonium ions. Ammonium ions reduce the amount of water-soluble oxygen and endanger aquatic life. Using microorganisms (bacteria) in aerobic conditions, ammonia can be converted to nitrite and then nitrite to nitrate. These reactions are based on the oxidation process and require oxygen-rich water.

All of the above indicate the importance of oxygen in water and its effective role in aquaculture. Dantek Engineering Technical Group has investigated all these cases and in order to solve the problem of oxygen supply for aquaculture, has started to build two-phase vortex pumps. Two-phase vortex pumps easily increase the oxygen level of the water to supersaturated levels by producing micro-nano-sized bubbles, and can be a good option as a pool oxygen supplier in all different seasons of the year. This type of pump significantly increases the oxygen transfer efficiency in all parts of the water by producing very small bubbles and thus increasing the contact surface of these bubbles in relation to their volume. The persistence of nanobubbles in water leads to the retention of water-soluble oxygen and the rapid diffusion of oxygen in all parts of the water.

Advantages of using a two-phase vortex pump in the aquaculture industry

  • Improve digestion and absorption of food due to the presence of oxygen in water (improve the feed conversion ratio due to the presence of oxygen)
  • Prevent water poisoning by substances excreted from aquatic creatures
  • Maintain health, growth and vitality of fish
  • Increase the rate of aquatic growth and reduce the length of the aquatic growth period
  • Reduction of incubation period
  • Reduce the cost of consuming nutrients which are used to increase aquatic weight
  • More aquatic storage per unit volume and thus increase aquatic production per unit volume with sufficient oxygen in the water (dense breeding)
  • Reduce losses and prevent aquatic mortality in fish ponds in warm waters and summer
  • Prevent nitrogen gas saturation in water
  •  Disinfection of water, purification and production of oxygen using ozone gas (elimination of various microbial contaminants)

In the aquaculture industry, two-phase vortex pumps can be used in the parts of fish hatchery incubation process, fish ponds, aquaculture closed circuit system (RAS) and aquaponic systems (combination of aquaculture and plant breeding).

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