A closed recirculating aquaculture system (CRAS) using oxygenated ultra fine bubbles

Summary

This video introduces an innovative closed recirculation aquaculture system that uses oxygenated ultrafine bubbles (UFN) to address challenges in traditional aquaculture. By enhancing oxygen levels and improving water quality, the system accelerates fish growth and reduces the need for costly equipment like oxygen dissolvers and sterilizers. The use of UFN also prevents bacterial growth, improves tank cleanliness, and reduces labor. The system has been successfully tested with fish species like tiger puffer, scorpion fish, and black scraper, showing promising results in faster growth and reduced disease, offering a more cost-effective and sustainable approach to aquaculture.

Takeaways

• 😀 Traditional recirculation aquaculture systems are less susceptible to external factors like red tides, fish diseases, and weather, but come with high initial and operational costs.
• 😀 Ultra-fine bubbles, particularly through oxygenated systems, offer a key innovation to reduce the cost of traditional aquaculture while maintaining high productivity.
• 😀 The innovative system uses Aquan Nanox, an oxygenated ultrafine bubble generator, to control dissolved oxygen (DO) levels in rearing water throughout the system.
• 😀 This closed recirculation aquaculture system reduces the need for multiple oxygen supply sources, cutting down on facility costs and energy usage.
• 😀 Unlike traditional methods, the Aquan Nanox system maintains dissolved oxygen levels above 10 mg/L, even after passing through biofilters, ensuring healthy fish growth.
• 😀 The use of oxygenated ultrafine bubbles also avoids the need for other sterilization methods like ozone or electrolyzed water, which can be harmful to fish.
• 😀 The system helps reduce cleaning frequency in tanks, channels, and piping due to the cleaning effect of ultrafine bubbles, reducing stress on fish and the need for manual labor.
• 😀 Ultrasonic bubbles also prevent the decay of excess feed and dead fish, contributing to better water quality and less odor in the rearing tanks.
• 😀 A bacteriological examination showed that using oxygenated ultrafine bubbles reduced the bacterial count in rearing tanks to just 32 CFU, showcasing the system's bacteriostatic effectiveness.
• 😀 The innovative system has been tested for 8 months with successful results, showing no adverse effects on fish, and the growth periods for species like tiger puffer and scorpion fish have been significantly reduced.
• 😀 The closed recirculating aquaculture system with oxygenated ultrafine bubbles is expected to be scalable and adaptable to different fish species, potentially addressing global food security issues by increasing fish production efficiency.

Q & A

What are the advantages of traditional recirculation aquaculture (R)?

Traditional recirculation aquaculture systems offer advantages such as controlled environmental conditions in the rearing tanks, making them less susceptible to external factors like red tides, fish diseases, and heavy weather. Additionally, they are high-yielding systems.

What are the disadvantages of traditional recirculation aquaculture (R)?

The main disadvantages of traditional recirculation aquaculture include high initial and running costs, which lead to low profitability.

How do ultra-fine bubbles contribute to improving recirculation aquaculture systems?

Ultra-fine bubbles help reduce costs while maintaining productivity by optimizing dissolved oxygen levels, improving the performance of biofilters, and reducing the need for multiple oxygen supply sources. They also offer sterilization benefits without the risks associated with traditional methods.

What is the unique feature of the recirculation aquaculture system introduced in the script?

The unique feature of this system is the use of Aquan Nanox, an oxygenated ultra-fine bubble generator, which controls the dissolved oxygen levels throughout the entire recirculation aquaculture system, improving water quality and fish health.

What role does the biofilter play in the system?

The biofilter helps activate nitrifying bacteria through the high concentration of oxygen and ultra-fine bubbles in the water. This maximizes the biofilter's performance and ensures optimal water quality for fish rearing.

How does Aquan Nanox help in controlling oxygen levels in the system?

Aquan Nanox generates highly oxygenated water containing ultra-fine bubbles, maintaining dissolved oxygen levels above 10 mg per liter even after passing through the biofilter. This ensures consistent oxygen supply throughout the system using a single source.

Why is the use of Aquan Nanox more cost-effective compared to traditional methods?

Aquan Nanox eliminates the need for additional equipment like oxygen dissolvers, carbon dioxide diators, suction units, and UV sterilizers, significantly reducing both initial and running costs.

What are the advantages of sterilization using ultra-fine bubbles compared to traditional methods?

Sterilization with ultra-fine bubbles is safer because it only uses oxygen, eliminating risks associated with residual chlorine or oxidants left behind by traditional methods like electrolyzed water or ozone sterilization.

How do ultra-fine bubbles contribute to maintaining clean tanks and piping?

Ultra-fine bubbles have a cleaning effect, making tanks, channels, and piping resistant to dirt. This reduces the frequency of large-scale cleaning operations and minimizes stress for the fish.

What effect do ultra-fine bubbles have on water quality in the breeding tanks?

Ultra-fine bubbles help maintain water quality by preventing the decay of excess feed and dead fish, which would otherwise lead to deterioration and bad odors. They also have a bacteriostatic effect, limiting bacterial growth in the water.