Technology for sustainable growth in Aquaculture
Addressing key challenges through New Innovative Technology
Hauge Aqua's believes that the current production platform based on open pen systems is too weak to sustain significant growth, recognised environmental performance and societal expectation. Hauge Aqua's ambition is to provide a trustworthy and competitive alternative production platform.
By our excellent team and collaborative partners, we offer the industry a fully contained system in which we address many of current costly challenges that apply in today's farming.
- The sheltered workplace addresses health and safety for the staff by eliminating many high-risk operations
- The Salmon louse will have great difficulty to enter our system
- Due to the level-separated intake- and outflow of water the pen to pen, as well as site to site infection pressure are dramatically reduced
- The design, water flow and stable environment will address fish welfare and performance
- The closed containment and feeding regimes enable more accurate feeding without any loss of uneaten feed
- The robust unit will reduce risk of escape during sea phase
- The retrieving of particulate faeces, will enable to reduces discharge and provide an opportunity to increase production per site
The shape of the new robust and enclosed tank is that of an egg built in composite sandwich. The shape provides a complete seamless double curved surface. Ninety percent of the tank is submersed at all times, whereas ten percent is above the water and filled with air. Inside the tank, a central tube is placed and stiffens off the structure vertically.
The shape diverts external forces and makes a robust geometrical structure.
The egg targets to replace the large circular net pens used in today's typical site set-up. Likewise, it is designed to be supported by existing infrastructure such as the feed barge and electrical power. It is towed into the anchoring frame while still empty of water. Once inside the frame and plugged to power, the pumps start and gradually the egg will sink until it reaches its operating position. The tank is then moored horizontally into existing mooring system in a farm.
The egg-structure is fully enclosed. The unique water flow enables the system to draw inlet water segregated from where outlet water is released. The inlets are located in the bottom of the egg. Water enters by the use of two main pumps that suck water from below 20 metres. The water flows in a circular movement to the top where it exits the tank 4 meters below surface. Water quality and volume can be controlled, ensuring steady oxygen levels and also de-gassing of carbon dioxide. The bottom entry makes sure that lice larvae do not enter the pen since salmon lice larvae natural habitat predominantly is in the top layer. The water inlet and outlet is double-secured so that escape is not possible.
The feed is supplied through regular automatic feeders as used on sites today. By use of internal feeding automation the feed is supplied at various levels in the water body. While following the water current from the bottom to the top, one can easily control that all feed pellets are eaten and nothing wasted.
While it is easy to pump water into the tank, catching the fish inside, harvesting off the big ones and emptying the tank for fish, are just as important. It is done by an expandable fish grid as shown in red below. It can be moved slowly down in collapsed position so that it does not affect the fish. Once at desired level it can be expanded, so that fish located above the grid can be trenched. It can also be used to grade off the biggest fish for harvest. While stored away in the top of the egg, it is fully collapsed.
Although not widely recognised as a challenge today, improving the control of feed spillage and collection of particulate material, significantly improves the industry use of resources.
Feeding accurately is alleviated by use of a contained system. The up-going stream of water keep the feed pellets accessible for the fish for a longer period than in open systems where uneaten feed drifts out of the pen by the current.
The shape of the egg will increase the speed of the water and hence vertical and centripetal forces on particles as the water flows to the top of the tank. These forces are utilised to trap particles and retain them in a circular holding tank. While most of the water is discharged through main valves, the technology aims to filtered off particulate fish faeces and contain it in a circular ring tank embedded in the buoyancy structure. Once retained in the circular tank the by-products can be collected and removed. Particulate material (fish faeces and uneaten food if necessary) collected in the tank can be used as a valuable resource.
Light is controlled 24 hours a day inside the egg. The fish avoids direct sunlight may be supplied with the ideal amount and wavelength of light. As opposed to open net pens where oxygen can vary by season, upwelling and tide, the egg provides an opportunity to keep oxygen at adequate levels at all times.
The temperature profile of deeper layers of the fjords provides less temperature variation than in the water surface. This supports better winter growth in the egg than in open cages. It evens out the harvest profile and is good for the market supply.
The robust egg-shape and material makes it suitable for today's locations. Because of the reduction of discharge of nutrients, due to the aforementioned collection of fish faeces with the particle trap, one can produce more fish per site within the same discharge consent. The fish farmers can operate many eggs from the same land base or feed barge. This opens up for sites that may hold more fish than today.
The egg opens up for new areas for fish farming both because lice and escapes no longer represent an unacceptable risk, and also, the technology is not depending on high current sites since all water is pumped.
Health and safety of personnel in daily operations of the unit is important. Most important contribution to health and safety is the significant reduction in high-risk operations.
Apart from this, the docking area is well defined and secured. While inside the unit, the operator is sheltered from waves, splash, rain and wind as well as enjoying a comfortable air temperature
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