The density of fish in a farm pen is much greater than in the average
aquarium, and I hope that someone will comment on the relevance of greater
oxygen demand, effluent production, and related topics to this suggestion.
As I understand it, the value of open sea farming is in large part due to
the flushing, which is not present in a concrete pen.

Bill Silvert

----- Original Message -----
From: Franklin Wayne Poley <[log in to unmask]>
To: <[log in to unmask]>
Sent: Terça-feira, 15 de Agosto de 2000 23:02
Subject: Re: FF: Massive Ocean Aquaculture Cages


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.

><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
       To leave the Fish-Sci list, Send blank message to:
        mailto:[log in to unmask]
 For information send INFO FISH-SCI to [log in to unmask]
><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>