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Subject: Re: FF: Massive Ocean Aquaculture Cages
From: James A Mackie <[log in to unmask]>
Reply-To:Scientific forum on fish and fisheries <[log in to unmask]>
Date:Thu, 17 Aug 2000 07:47:34 +0100

text/plain (31 lines)

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?

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.


Jim Mackie

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