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There's no need for pumping and aeration in the offshore cages. They are nets over a rigid frame, not closed containers. A Mississippi Sea Grant sponsered research group called the Gulf of Mexico Offshore Aquaculture Consortium is currently evaluating the feasibility of using the Ocean Spar cages in the Gulf of Mexico. They made a presentation recently to the Gulf of Mexico Fishery Management Council, and the Council was impressed with the approach. See the following URLs for more information:
Ocean Spar Technologies, LLC
http://www.oceanspar.com/
Gulf of Mexico Offshore Aquaculture Consortium
http://www.masgc.org/offshoreconsortium.html
Sincerely,
Steven Atran, biologist
Gulf of Mexico Fishery Management Council
Scientific forum on fish and fisheries <[log in to unmask]> wrote:
> Closed containers along the shoreline would be expensive to build and
costly to operate because of the pumping and aeration. Other costs? So it
gets down to whether there is any profit in it after all that. Any data
for operations like this yet?
FWP
How do you exchange water in a closed container at sea? You will need
pumps and aeration. What happens to the debris? Do you filter it out or
just dump it with the discharged water? If you put pumps at sea there is
the added risk of fuel spillage which will cost the environment a lot more
than fish waste. On pump ashore you can put in place sediment traps to
reduce the amount of effluent going into the sea. These can be used as grow
out tanks for other species. You can protect pumps in case of fuel spillage
and it is easier to use electric pumps. There is less risk to the
installation from bad weather if it is onshore.
Regards,
Jim Mackie
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