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Traceable seafood means its origin and the way it was caught can be verified. Seafood with the blue fish tick can be traced back to an MSC certified sustainable fishery.
Shockingly, around a third of all seafood traded globally is not what it says it is. This is called seafood fraud. There are two reasons for this: intentional and unintentional. Whether it’s a genuine mistake or deliberately cutting costs for profit this is a major problem.
Seafood fraud presents a few problems:
The MSC’s traceability program is helping to eliminate seafood fraud through a network of partners certified to the MSC Chain of Custody Standard.
Discover five surprisingly simple steps to eradicating seafood fraud
When you see seafood with the MSC blue fish tick, it means that all along the supply chain, from ocean to plate, MSC certified fish has been separated from non-certified.
To make sure this works, every company at every step along the chain has been audited to the MSC Chain of Custody Standard.More than 38,000 sites around the world, including supermarket chains, fishmongers, hotels and restaurant chains are part of this global network of traceable supplies. We regularly check to see if this traceable Chain of Custody is working.
DNA testing has shown that mislabelling rates for MSC labelled seafood are less than 1%.
When you look at a piece of meat or a piece of fish, it’s often difficult to tell what species it is. Turn it into a pie or a fish cake and the difficult becomes the impossible. That’s where DNA testing helps. With a sample half a centimetre wide dropped into a little tube of preservative, you can find out if your fish is what the packet says, or if it is something else.
DNA testing is just one of the checks we use to make sure the fish in the packet is the same as the fish on the label. That helps us to make sure MSC certified companies are following the rules on traceability and labelling.
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There are two places in your cells where DNA live: the cell nucleus (the famous bit that codes how to make a person) and tiny little rings of DNA inside things called mitochondria. These are microscopically tiny little structures inside each cell that provide the power. Think of them as a few hundred little batteries powering the cell and you’re not far off.
Each of these mitochondria has its own DNA wrapped into tough little circles so it can replicate itself.
Those long strands of DNA in the nucleus are really long. The cod genome is made up of the same four letters that make up the genetic code, C, A, G, and T and it’s about 830 million letters long – the same as a stack of books nine metres high (about 30 feet). You also only get one copy per cell.
You need something shorter, with lots of copies per cell and that’s where those little circles of DNA in mitochondria come in handy. Because you get hundreds of copies in each cell, you don’t need many cells to test. That’s particularly helpful if you have a really small sample.
Step back from fish for a moment and imagine we have two USB memory sticks or those little cards that go in the back of a camera. One is full of Shakespeare, the other one is full of poetry by Wordsworth. But we don’t know which is which. We could read the whole thing, but that’s slow and expensive. DNA barcoding looks for a simple passage, a bit like running a google search. If we search for “I wandered lonely as a cloud…” and find it, then we’ve got the Wordsworth collection. If it finds “Romeo, Romeo, wherefore art thou Romeo?” we can be pretty confident that the memory stick contains Shakespeare.
The same thing happens when we test a piece of fish – albeit without the romantic poetry. The DNA barcode is located in a specific sequence of DNA about 500 letters long and made up of those same four letters, C, A, G and T.
By looking for these short barcodes, you can tell if your sample is a cod, a haddock, or a cow. All you need is a reference library of accurate samples, a small piece of your mystery fish and a friendly independent laboratory that can carry out the test.
There are many labels out there, so how does the blue fish compare to others?
Wild, traceable, sustainable: the blue fish label is only applied to wild fish or seafood from fisheries that have been certified to our standard
Use our Australian and New Zealand curriculum-relevant teaching and learning resources to improve ocean literacy.
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