Bingo, John's spot on IMHO.
Jon McGraw
Seafreeze
-----Original Message-----
From: John Sackton [mailto:jsackton@seafood.com]
Sent: Wednesday, October 17, 2007 1:01 PM
To: Richard Chivers
Cc: seafood
Subject: Re: Cod and Alaska pollack
Why would this most likely not be an example of cross contamination.
Many factory trawlers fish for both cod and pollock. A fillet
inspection line, for example, could easily be a site of cross
contamination between the two species.
Alternatively, this could have been a thawed fillet from frozen H&G
cod, and the same factory could also be producing Alaska pollock
fillets. The entire handling history of the fillet would have to be
traced to determine where the AK pollock dna came from.
If this was from a fillet block, there is a practice of using minced
fish along with whole fillets in some blocks -- this could be another
source, if minced pollock was used instead of minced cod.
best
John Sackton
Seafood.com News
On 10/17/07, Richard Chivers <richard@fishonline.co.uk> wrote:
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> Dear All,
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>
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> 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.
>
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> 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.
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> Thank you in advance.
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> Richard Chivers
>
> Seafood Audit International
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>
-- John Sackton Seafood.com News
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