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Subject:

Re: FF: Massive Ocean Aquaculture Cages

From:

Franklin Wayne Poley <[log in to unmask]>

Reply-To:

Scientific forum on fish and fisheries <[log in to unmask]>

Date:

Thu, 17 Aug 2000 12:28:37 -0700

Content-Type:

TEXT/PLAIN

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Please let us know. I just emailed the BC Fisheries Department and asked
what they are doing re closed containment fishing. This is mainly a
Federal responsibility but DOF answers my email with lengthy replies which
dance all around the subject and don't answer the questions.
   Those figures from Andrew Storey were 600,000 kg. of Atlantic salmon
for a 20,000 cu. meter cage. Now all we need is the time figure. Does
anyone on Fish-Sci have an answer? 600,000 kg/year? Three years? Whatever
it is, these are big gross revenues for a cage with the area of a city
lot.
   Also as Jim notes below, while closed containment on shore is likely to
be costly, there are advantages like more immunity from storms. (Also
predators I would think). And maybe the waste could be recycled through
anaerobic digesters or algae ponds and could even become another source of
revenue. I'm not saying all this is easy but it is worth looking into.
   There is also the False Creek Model Sustainable Village for 5,000
people on the shore of False Creek Inlet in the centre of Vancouver. This
project is under the auspices of City Admin on land owned mostly by
them. The project is long and narrow with almost a mile of shoreline. And
it is next to a proposed high tech campus, also being planned as sort of
BC's Silicon Valley for 6,000+ workers. Just contact City of Vancouver for
details.
   Thus if some kind of shoreline closed containment system is feasible,
it could find a testing ground at the False Creek Sustainable Village.
FWP

On Thu, 17 Aug 2000, Bob McClure wrote:

> I recently heard of a system (being used for captive broodstock in Seattle,
> WA (USA) using tanks but in the water. I'll see if I can't get some
> information and a link?
>
> -----Original Message-----
> From: Scientific forum on fish and fisheries
> [mailto:[log in to unmask]]On Behalf Of James A Mackie
> Sent: Wednesday, 16 August, 2000 11:48 PM
> To: [log in to unmask]
> Subject: Re: FF: Massive Ocean Aquaculture Cages
>
>
> 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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