Blue prawns

From: Richard Chivers (richardchivers@btconnect.com)
Date: Thu Nov 13 2003 - 07:41:00 PST

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I have just inspected some prawn (I believe they are Pandalus borealis)
sandwiches in which the prawns had turned violet blue and were very soft
textured. I have pictures if anyone would like to have a look.

The sandwiches were made with both white and brown bread, they contained a
little mayonnaise and lettuce. They were made 2 days before the inspection
and were produced for us by the manufacturer who wanted to know what had
happened. Micro analyses are incubating at the moment but in the meanwhile
I am seeking your opinions.

My feeling is that it is advanced spoilage, but I do not know what agent
causes the change in colour.

Any information would as usual be gratefully received.

Richard Chivers
Seafood Audit International

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