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These are huge yields and must be hugely profitable. A cage of 100,000
cubic meters is about 70 x 70 x 20. That's pretty small compared to the
Burrard Inlet for example (which is only a block from me). What would it
cost to build a concrete wall 70 metres into the inlet which would be 70
metres across and 20 metres deep? I have a couple of scuba licenses and
dry suit and I can dive to 20 metres with ease so that's a good depth.
This is then a big aquarium. Next, how about one of more ponds into which
the effluent could be pumped? Can the water then be tested in a
cost-effective way before release? Lots of contractors can tell you how
much it would cost to build these big fish tanks. Vancouver Aquarium can
tell you about managing large aquariums.
CTV News used to invite email comments from viewers and a couple of
years ago they broadcast my suggestion that we use Burrard Inlet for
closed containment fish farming so they must have thought it was at least
worth discussing.
FWP.
On Tue, 15 Aug 2000, John Foss wrote:
>
> ===== A message from the 'fishfarm' discussion list =====
>
> Massive Ocean Aquaculture
> Cages, up to 100,000 cubic
> Meters, On Drawing Boards by
> Ocean Spar
>
>
>
> Ocean Spar Technologies of Bainbridge Island,
> Washington reports that it has built and installed a second
> 20,000 cubic meter Ocean Spar sea cage in an offshore
> site on the west coast of Ireland. Their first large cage,
> installed in 1999, has completed its second harvest cycle.
> These cages, with a capacity of 600 MT of salmon, are
> currently the largest in use in the salmon farming industry
> outside of Norway, helping salmon farmers drive towards
> even greater efficiency and lower costs.
>
> The design of the Ocean Spar cage, which uses spar
> buoys as floating fence posts, lends itself to the
> construction of even larger cages and discussions are
> underway for 40,000 cubic meter salmon cages and
> 100,000 cubic meter tuna containment cages.
>
> Ocean Spar cages have been in commercial use since
> 1996. They provide large volume cages for exposed,
> offshore sites, as well as for farms in high current and
> traditional farming areas. The cage design also lessens the
> risk of escapes, makes it more difficult for predators, such
> as seals, to attack, and provides greatly reduced visual
> impact.
>
> Large scale Ocean Spar cages are used in offshore
> farming projects in Ireland, East and West North
> America, Cyprus, Canary Islands, Gulf of Mexico, Hawaii
> and the Philippines growing such diverse species as
> salmon, sea bass and bream, summer flounder, moi and
> milkfish. The Company believes its fish containment
> systems will open up new opportunities for the
> aquaculture industry worldwide. Large scale open ocean
> cages, that reside primarily below the surface, make it
> possible for aquaculture production to expand into areas
> where it had not been possible before, and to mitigate
> shore impacts.
>
>
>
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