Shrimp disease has been widespread and has caused great damage to the shrimp industry, which has promoted the development of different farming methods to improve shrimp health management. One of the methods implemented in some countries like Thailand, Korea which have properly results is Aquamimicry technology. Shrimp culture using Aquamimicry technology, after harvest, has no odor, black mud or accumulated sediment, and may therefore be ready for the next production cycle by adding fermentation broth and products. biological. At the same time, cultured shrimp are judged to be of better quality than those of conventional culture and are rapidly spreading around the world.
– In recent years in Thailand, Aquamimicry shrimp culture based on the principle of maintaining the balance of microalgae and biofloc in the system was tested and developed.
– The essence of Aquamimicry technology is to develop nutrient-rich plankton, especially crustacean crustaceans. These plankton play a role as nutrient-rich foods for shrimps while maintaining water quality. Compared with BioFloc technology, this technology can operate more easily, without requiring too high technical requirements. In the system the amount of carbon that can be increased or decreased does not exceed the stringent requirements on the rate of nitrogen input. In addition, the number of biofloc pellets is not limited as there are re-used animals that help the culture system not to collapse the biofloc system.
– The biggest advantage of the process is the minimization of fluctuations in pH and dissolved oxygen. At the same time, the biosecurity is high due to limited water exchange and the supply of nutrient-rich foods, so the shrimp are in good health.
2. Pond system
– If extensive farming, large area does not need to arrange filtration system, water treatment.
– In case of application of intensive aquaculture technology, the system of ponds including process ponds, shrimp ponds, intermediate ponds and ponds filtered, treated water. The area of the ponds depends on the culture system, with the best conditions for ponds with a 1: 1: 1 pond area. The surrounding pond depth is about 2 m, the pond depth About 4 meters to easily gather the residue. In settling ponds, some of the bottom-dwelling fish such as catfish and fish can be stocked to utilize the excess nutrients in the pond and to improve water quality.
– Water after treatment in the settling pond system is pumped into the intermediate pond system for a period of time when tilapia is released. After the water is thoroughly treated the intermediate ponds continue to pump into the pond. Thus, the water used for shrimp culture ensures nitrogen excretion to a minimum.
– In ponds, the layout of the paddle system around the pond system to maintain the dissolved oxygen required for the respiration of shrimp, microorganisms, zooplankton, algae … In addition, when running Water fans, water disturbances make floc particles float; Otherwise, these particles will be deposited, metamorphosed, toxic gas, toxins in the pond, directly affect the development of shrimp. Therefore, it is necessary to maintain the water fan during the process from water color to the end of the culture process.
3. Prepare the pond
– Drain the water into ponds through filter bags with mesh size of 200-300 micrometers. Water level is 0.8 – 1 m.
In order to enrich the natural food sources, the fermentation process requires the fermentation of carbon sources with rice bran, fermented wheat with microbial fermentation.
– Method of fermentation: Use rice bran, corn or wheat flour mixed in water at a rate of 1: 5-10, then the enzyme, stir and then aeration for 24 hours continuously. During fermentation of rice bran powder, the mixture should be maintained at a pH of 6 – 7. After fermentation, rice bran powder can be added directly to the pond at 50-100 ppm compared to pond volume. feed.
4. Management, care
– Drop shrimp at stable weather, cool temperature with a density of 30-100 individuals / m2 (depending on the culture). After stocking, fermented bran is added daily to feed the plankton in the pond. The amount of fermentation bran to be added depends on the culture system and the turbidity of the water. Normally, with extensive farming systems, large areas can be supplemented with 1 ppm fermented rice bran compared to pond water volume. For intensive culture systems it is possible to add 2-4 ppm to the pond water volume. In addition, the amount of fermented bran added to the pond system is based on the turbidity of the pond, it is necessary to maintain the turbidity of the pond about 30 – 40 cm. If higher turbidity can be added to fermented bran and vice versa.
– In the process of raising, it is necessary to periodically replenish the bio-product to maintain water quality and promote the formation of floc particles.
The biggest drawback to the Aquamimicry shrimp culture process is that it is difficult to carry out in-house conditions, as well as the large area used for ponds.