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Subject: Green post-freezing discoloration in tropical shrimp?
From: Mariana Horsten <[log in to unmask]>
Reply-To:Scientific forum on fish and fisheries <[log in to unmask]>
Date:Thu, 17 Aug 2000 10:41:29 +0200

text/plain (33 lines)

I have received the following query, regarding shrimp fisheries in Cameroon:

" Here (in Cameroon), 'Giant Sea Shrimps (Sea Bob)' are caught at sea, and
frozen onboard.  After about a week at sea, the boats return to port, where
the catch is treated with 'sulfite' and prepared for sale.  However, about
20% of the catch develops a green discoloration, and has to be discarded.
What causes this?  I suspect it's either a bacterial infection or 'enzymatic
oxidation'.  I've read that Ivory Coast has a similar problem, but there the
shrimp turn black. "

If anyone has information on this phenomenon, let us know!


  Mariana B. Horsten
  Department of Marine Fisheries
  Danish Institute for Fisheries Research (DIFRES)
  DK-2920 Charlottenlund

  Email: [log in to unmask]  ---  Tel: (+45) 33 96 33 59
  Website: (updated: 21.06.2000)

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