Application of Micro Bubbles Technology in Catfish Rearing

Application of Micro-nano Bubble Oxygen technology in\r\ncatfish rearing has markedly positive effect compared to conventional\r\ntechniques.

Studies on the effects of small or micro bubbles are gaining\r\ninterest in recent years, especially in Japan. Technology Micro-Nano\r\nBubble (MNO) was first tested in the study of aquaculture in Japan in\r\nmodels fan oyster and scallop. Accordingly, the growth rate of the\r\ncultured subjects is improved by ensuring the dissolved oxygen content is\r\nalways optimal during the culture process.

In fact, nano-sized bubbles can help separate pollutants from\r\nwater, especially fats, and are thought to greatly affect the pH of\r\nwater. When micro or nano-sized air bubbles shrink and break down, they\r\nwill release many free radicals, which can kill bacteria and eliminate\r\nodors. Moreover, the technology to create a small and micro-plastic bubble\r\ndevice called Micro-Nano bubble Oxygen (MNO) when applied to aquaculture will\r\nbring some benefits:

1. \r\nGenerating a lot of oxygen is the factor that\r\ndestroys the bacteria and fungi that cause dangerous animal diseases

2. Generate oxygen to settle alum in water such as\r\niron alum, alum and heavy metals

3. Neutralize ammonia and other toxic gases\r\n(chemical or biochemical reactions with the participation of aerobic bacteria

4. Helps to grow and extend the growth cycle of\r\nbeneficial algae; and v) helping beneficial aerobic bacteria thrive.

Thus, MNO machine has many advantages Vietnam can support\r\nand apply well for aquaculture to improve production efficiency. Air\r\nbubble technology MNO can be considered as one of the optimal solutions to help\r\naquaculturists succeed.

In recent years, some studies have been conducted to\r\nincrease the survival rate for fingerling rearing in the Mekong Delta, but the\r\nsurvival rate for rearing pangasius from flour to seed is low due to the impact\r\nof too many technical and environmental factors. schools and they need to be\r\ncontrolled and perfected. Therefore, it is necessary to study and improve\r\nthe breeding process and fingerling rearing to provide sufficient quality\r\nPangasius for commercial farming. The use of MNO to arrange improved\r\nnursery systems will be considered a good solution for the complete process of\r\nfry to fry.

Application of Micro-nano Bubble Oxygen technology in\r\ncatfish nursery ponds

Experimental arrangement: Experimental rearing powdered\r\ncatfish to fry using technology

Micro-Nano Bubble Oxygen according to nursery\r\ndensity. Using MNO (4HP; 3phase; Capacity: 70 m 3 / h) with the\r\nability to provide oxygen 20,5kg / day in the pond area of 2,000 m 2 ,\r\nin particular:

+ Density of 500 shrimp / m 2 : 3 ponds\r\nwith Micro-nano Bubble Oxygen technology and 1 control pond.

+ Density 750 shrimp / m 2 :\r\n3 ponds with Micro-nano Bubble Oxygen technology and 1 control pond.

Care and management

Use a mixture of homemade food,\r\nfresh duck eggs (only boiled yolk , pureed), S-pak 2/5,\r\nS-pak 8/5, Tomking 1s, fingerling feed size 0.4 li 40% protein or\r\nmore.

How to feed fry

Feed by hand, using the mixture to\r\nstir evenly. From 01 to 04 days of age, feed once a day at 9-10am and from\r\n05-30 days old, feed twice a day at 7-8 am and after 15-16 hours.

Time to run fans and MNO

From 10-30 days old, start\r\noperating oxygen supply system for fingerlings. Time\r\nruns from 3-7 am and afternoon from 14-15 hrs. Depending on\r\nthe age of fish, weather, stocking density, fish health, adjust the\r\nnumber of fans, reasonable fan operating hours , avoid\r\noxygen content <4 mg / L.

The application of Micro-Nano Bubble Oxygen technology in\r\ncatfish rearing ponds from fry to fry has shown positive results. The MNO\r\nequipment supplied and ensured the dissolved oxygen level was quite high, about\r\n7.42-8.74 mg / L higher than the control pond (5.32-6.85 mg / L) and\r\ncontributed to the improvement. High survival rate of fish in MNO applied\r\nversus non-applied ponds. After 28-29 days of rearing, the production\r\nefficiency of the MNO application showed a statistically significant difference\r\nbetween the control and control ponds.

After 29 days of rearing, the survival rate of fry in 02\r\ntypes of ponds with density of 500 fish / m 2 and 750 fish / m 2 reached\r\n31.23 - 32.32% higher than the control pond (21.36- 22.99%). Similarly,\r\nFCR of fish in experimental ponds ranged from 0.56 to 0.62 lower than that of\r\ncontrol ponds (0.71 to 0.76).

Comparing the results between the\r\ntwo stocking densities shows that the experimental pond with a\r\ndensity of 750 shrimp / m 2 achieved an average yield of\r\n285.65 kg / 1,000 m 2 higher than the experimental ponds at a density\r\nof 500 shrimp / m 2. is 193,35kg / 1,000m 2 and\r\nhas high economic efficiency than the control ponds (P <0.05).

Application of MNO technology has ensured better supply of\r\ndissolved oxygen content for ponds, and also contributed to reducing\r\nelectricity consumption in operating the oxygen supply system for ponds from\r\n5.0-16.14% compared to with the control pond.

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The application of MNO technology in catfish rearing ponds\r\nfrom fry to fry has shown positive results and the stocking density of 750 fish\r\n/ m 2 is suitable to ensure economic efficiency.

Source: tepbac