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SUSTAINABILITY & INNOVATION2019-07-24T07:06:11+00:00

FOOD FOR
THE FUTURE

Notably, the production of fish in aquaculture systems has a lower carbon footprint per kilogram of output compared with other terrestrial animal production systems. This ultimately means that fish systems have much lower nitrogen and phosphorous outlet when compared to beef and pork production systems. Typically, fish species, such as the Atlantic Salmon and Sea Trout, have a feed conversion ratio of about 1:1.2, which means that just over 1 kg of feed is converted to the equivalent quantity of fish meat.
The feed requirements for the production of food are therefore far more sustainable when comparing the typical feed requirements of land-based animals (beef has a typical feed conversion ratio of 1:6). Together with insects, fish are the most efficient converters of feed into a high-quality protein source. Unfortunately, fish stocks in the world’s oceans are declining fast due to overfishing. Aquaculture therefore has an enormous role to play in food security for current and future generations and is therefore commonly referred to as the new “Blue Economy”.

AQUACULTURE
METHOD

There are various methods of finfish aquaculture, which include:

  • open-net pens or “cages”, where fish are kept inside a large floating net, fixed to the bottom of a lake or sea bed
  • pond-based aquaculture, where ponds are either fully or semi-enclosed bodies of water and where water is filtered and treated before return to the ocean
The Recirculating Aquaculture System (RAS), as selected for the Cape Nordic Corporation Project, is such a pond-based system, where a closed environment allows for water to be treated and recirculated, with reduced wastewater discharge. In contrast, open-net pens allow for interaction between the environment inside the pen and outside the net. This means that there is a risk of waste, chemicals, parasites and diseases being exchanged between the two environments, with a possible disturbance of the local ecosystem.

RAS SYSTEM METHOD
Some of the benefits of Recirculating Aquaculture Systems (RAS) include:

SAFE SEAFOOD

Minimise any requirement for antibiotics and therapeutants resulting in the production of high quality, ‘safe’ seafood.

HEALTH REGULATIONS

No requirement for predator or parasite control.

ECOLOGICAL ADVANTAGES

Eliminate the release of parasites and alien fish species to recipient waters.

SECURE PRODUCTION

Enables secure production of non-endemic species.

MULTITROPHIC AQUACULTURE

Full control over effluent waste, which can be treated before discharge.. CNC will utilise multitrophic aquaculture to create a completely independent ecosystem, allowing for the discharge of essentially clean water back into the ocean.

FLEXIBILITY IN PRODUCTION

There is flexibility in the production meaning that, in the longer term, multiple species can be farmed simultaneously.

PROCESSING
FACILITIES

Some flexibility in the location of the facilities allows for a site to be selected which is in proximity to markets and processing facilities.

INCREASED GROWTH RATES

Optimised feed use (superior feed conversion ratios) and increased growth rates compensate for additional energy costs associated with pumping and water purification (in comparison to open water sea cage fish farming).

REDUCED EXPOSURE TO BAD CONDITIONS

Reduced exposure of fish stock to stressful conditions, such as unfavourable weather, temperature, pollution, red tides and predation.



SYMBIOTIC
ECOSYSTEMS


With the wastewater effluent purge stream generated by the RAS system, CNC aims to create a symbiotic ecosystem, which will naturally filter and consume excess food, solid waste, nitrogen and phosphorous present in the water before discharge to the ocean.
An integrated multitrophic system comprising of several complementary aquaculture species will be incorporated as part of the complete fish production facilities. The various species will be introduced such that they feed off one another, as they do in nature, creating a balance between the biological and chemical processes in the system.

THE MULTITROPHIC AQUACULTURE SYSTEM WILL INCLUDE INCORPORATION OF THE FOLLOWING SPECIES:




ENVIRONMENTAL
CONSIDERATIONS


CNC aims to develop the fish facilities in the most environmentally-friendly manner and has considered:

  • Integrated multitrophic aquaculture systems, meaning that natural ecosystems will be created to clean the final effluent purge stream before returning this to the ocean.
  • Botanically-sensitive areas, which will be protected by means of facility and construction area setback, liners and cut off drains, such that there can be no influence of the multitrophic systems on the natural groundwater conditions.
  • Sustainable sources of freshwater via boreholes has been carefully considered and tested by CNCs geohydrology specialists.
  • Preservation of the dunes with a single dune crossing point considered at a location where environmental impact will be a minimum.
  • Energy efficiency of the entire facility by means of utilising the water in the RAS systems for natural thermal inertia and thereby minimising the energy footprint of the facility.
  • Generation of over 70% of the facility’s energy needs by means of renewable energy – namely wind power and solar PV. The wind turbines will be optimally located (set back from the coast) so that they do not pose a threat to migrating birds and furthermore do not result in excessive noise pollution for neighbouring farms and communities.
  • Aesthetically-pleasing buildings, which will blend into the natural environment and which will have minimal visual impact.

RENEWABLE
ENERGY

The entire aquaculture facility will be powered by renewable energy in the form of wind turbines and solar power.
2x 2MW wind turbines will be installed to supply the energy needs of the Stage 1 facility and this will be supplemented by solar PV as required. Stages 2 and 3 will incorporate an additional 4x wind turbines of similar size.


SOCIAL BENEFITS

IN GENERAL, THE CNC AQUACULTURE FACILITY IS EXPECTED TO SIGNIFICANTLY BOOST THE WEST COAST REGION AND WILL PROVIDE A NUMBER OF SOCIO-ECONOMIC BENEFITS.
The facility will eventually employ approximately 40 full-time staff in once it is fully operational (for Stage 1). There will furthermore be numerous opportunities throughout the value chain, including primary and secondary fish processing facilities, as well as the local supply of fish feed, chemicals, liquid oxygen and other essential components to the facility.
The facility will also include an onsite restaurant and visitors centre, which will encourage visitors to the area.
The incorporation of the integrated multitrophic aquaculture will attract research and development and the intention is to work with local universities and post-graduate students to further develop and optimise the multitrophic facilities, which are an innovative component to such RAS facilities.
There will be opportunities for social and enterprise development generated by incorporation of the multitrophic systems, which includes the cultivation of oysters, sea cucumber, sea clams and sea asparagus.


CONTACT US

EMAIL info@capenordic.co.za
MOBILE +27 82 572 7703

HEAD OFFICE
11 DE BEERS AVENUE
PAARDEVLEI
SOMERSET WEST
7130