In addition to possible cross contamination during processing, this
could be a situation where Pollock protein was injected into the cod as
a value added process. In this type of injection process, protein from
processing waste is ‘purified’ in a manner that does not normally
destroy the DNA. Once injected, the fillet would contain DNA from both
fish. This or cross contamination are far more likely than
interbreeding between such diverse species.
-----Original Message-----
From: owner-seafood@ucdavis.edu [mailto:owner-seafood@ucdavis.edu] On
Behalf Of Richard Chivers
Sent: Wednesday, October 17, 2007 12:53 PM
To: seafood
Subject: Cod and Alaska pollack
Dear All,
A sample of cod was analysed by a UK Public Analyst using a DNA
sequencing and he found evidence of DNA of more than one species. They
have confirmed cod, but also detected Alaskan pollack, and possibly one
more species. The sample was just a fillet of fish, presumably cod,
taken at retail.
Does anyone know of cod interbreeding with Alaska Pollack. The sample
was taken in the UK and I would normally expect this to indicate Gadus
morhua but it is possible that Gadus macrocephalus had sneaked in some
how.
Thank you in advance.
Richard Chivers
Seafood Audit International
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