15^th World Congress on Aquaculture & Fisheries September 27-28, 2019 Hong Kong

Ultraviolet system in Aquaculture: ULTRAAQUA UV systems continuously disinfect more than 100,000 m³/h of water in aquaculture systems. Millions of salmon, sturgeons, eels, turbot, sea bass etc. are produced in aquaculture systems worldwide. Here ULTRAAQUA UV systems have been chosen to increase security from infection diseases thereby protecting millions of invested dollars. Diseases such as Infectious Salmon Anemia (ISA) are prevented in Chile using ULTRAAQUA UV systems. This has given the respected fish farms security and reassurance that the fish is not infected. The UV systems are also easy to maintain, the lamp lifetime is 16.000 hours guarantied and they do not take up time in the daily routines. Therefore, our UV systems are highly recommended and used in several hundreds of aquaculture systems worldwide. Water abundance and purity continue to decline while disease concerns found in source waters continue to increase. Simultaneously, increased consumption of fish has led to growing demands for higher stock densities in the same hatchery footprint. Aquafina UV Systems are perfect for use in Fish hatcheries, Incubation, rehabilitation facilities, Depuration facilities, Aquariums Processing Plants Influent/effluent treatment

UV Applications in Aquaculture: Disinfection – the most common application of UV in water treatment. UV systems significantly reduce pathogen counts in incubation and rearing facilities and have proven to be the most cost-effective disinfection technology for the inactivation of many types of bacteria, viruses, and parasites harmful to many species of fish.

Ozone Destruction – ozone is often used in a fish hatchery to enhance the quality of problematic water sources used for incubating and rearing fish. However, residual ozone in the water can be extremely toxic or fatal to the aquatic life being reared. UV light systems are applied to consume the residual ozone in the bulk water prior to contacting the fish.

 Automatic Self-cleaning Micro Screen Filters used in aquaculture

Aqua care specifies micro screen Filters as a highly efficient solids removal filter for aquaculture applications. It is effective for fine and soft solids removal.

Aquaculture Pond Buoy: The Aquaculture Pond Buoy allows easy remote monitoring of dissolved oxygen levels and temperature in aquaculture pond raceways. The solar-powered buoy has an easy-to-use optical RDO Titan probe for 24-hour dissolved oxygen monitoring, plus a transceiver that transmits data wirelessly, right to your laptop or PC.

 Electropulse fishing: Electrofishing is a technique whereby electrical energy is put into the water and fish. Electrofishing relies on two electrodes which deliver direct current at high-voltage from the anode to the cathode through the water. When a fish encounters a large enough potential gradient on this path, it becomes affected by the electricity. Usually, pulsed direct current (DC) is applied, which causes muscular vibration in the fish, intercepting this energy, are drawn toward the probes and incapacitated in such a way that they can be captured with nets. The movement of fish toward the source of electricity is called galvanotaxis (uncontrolled involuntary muscular convulsion that results in the fish swimming toward the anode) and is believed to be a result of direct stimulation of the central and autonomic nervous systems which control the fish ‘s voluntary and involuntary reactions.

 The effectiveness of electrofishing is influenced by a variety of biological, technical, logistical, and environmental factors. The catch is often selectively biased as to fish size and species composition. When using pulsed DC for fishing, the pulse rate and the intensity of the electric field strongly influence the size and nature of the catch. The conductivity of the water, which is determined by the concentration in the water of charge carriers (ions), influences the shape and extent of the electric field in the water and thus affects the field's ability to induce capture-prone behavior in the fish.

 How it works

When a fish swims into a weak electrical field, it's going to not be affected in the slightest degree. There's a threshold of electrical charge that must be emitted into the water to effect on the fish. Once the electrical charge within the water is enough to allow transport of the charge across the nerve cells within the body, then the fish ‘s muscles can endure involuntary contraction. The contractions can cause increased exercise of the muscle and a buildup of feed within the blood stream. This method is incredibly almost like what happens to the muscles of a runner or a swimmer UN agency exerts a great deal of exercise. The runner or swimmer might eventually get a cramp within the muscle and can't move it effectively. once the fish cramps up, it floats to the surface and removed from the electrical field. The method to stun a fish is sometimes five – ten seconds.