Big pens are the dream of accountants.   ON paper the figures look good.
Practicallity is the draw back.   Big cages have been tried before in
different designs and locations.   The designers want to try changing a net
with 400 tons plus of fish in them or doing a sea lice treatment.   As for
closed containers, thre safest method is pump ashore.    During a sea lice
treatment I saw a gale lift 50 tonnes of fish and 180 tonnes of water when
it got under a tarpaulin.    A close container at sea will carry more risks
of this than a simple net.

Jim Mackie

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