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Fish Testing

u
uwsister Sep 9, 2011 02:35 PM

Recently my husband and I dined at a somewhat high-end restaurant and had an ahi tuna steak for an entree. My husband didn't like it, only had half of it, and we brought the leftovers home. My husband now suspects it wasn't ahi tuna but some other fish. I'm wondering, is there any way for us to have that piece of fish tested? Or is that a crazy-expensive ordeal that's just not worth it? I'm not really hung up on this, but I am curious. It would be nice to prove whether the restaurant mis-labeled the fish or not.

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  1. drongo RE: uwsister Sep 9, 2011 02:55 PM

    There are many places that do DNA testing of fish. But I don't know if the testing works on cooked fish.

    A LOT of fish sold commercially is mislabeled. Look at http://phe.rockefeller.edu/barcode/bl... where they discuss studies where the MAJORITY of red snapper and grouper from various restaurants and vendors were in fact something else.

    One example of a company that does DNA testing of fish: http://www.fishdnaid.com/

    1. r
      racer x RE: uwsister Sep 10, 2011 08:16 AM

      I recently used www.fishdnaid.com to test samples of fish fillets (mostly grouper and sea bass) I had obtained from a number of local raw fish vendors, including Whole Foods. I mailed unlabeled pea-sized samples of the fish to the company and received reports a few days later. (The lab analyses confirmed that all of the fish had been accurately labeled by the vendors.)

      I found fishdnaid by searching the web for the name of the scientist who runs the company, David Price, who had been quoted in articles discussing fish fraud that I had seen, and who had been selected by the state attorney general's office for a widely-publicized fish id analysis a few years ago.
      http://www.news-journalonline.com/spe...
      The lab accepts raw or cooked fish.
      (From the address I sent the samples to, I got the sense that he might be running this company from his home rather than from a university lab, but the results were really all that mattered.)

      There are also other companies that offer a similar service -- try searching the web.
      Or you could try searching for newsmedia articles on the topic, then contacting scientists who are mentioned in the articles and asking them if they perform the service.

      1 Reply
      1. re: racer x
        u
        uwsister RE: racer x Sep 10, 2011 11:39 AM

        Thank you both - fishdnaid.com looks perfect for what we are looking for. Surprisingly affordable. Glad to know they test both raw and cooked fish. I knew 'hounds would come through!

      2. b
        beachmouse RE: uwsister Sep 11, 2011 01:36 PM

        'Was your grouper sandwich from a restaurant really grouper?' is pretty much a stock investigative news report when Florida television stations run out of other ideas for that segment. Not sure who their usually testing company is, but if not fishdnaid.com, it's probably quite similar.

        3 Replies
        1. re: beachmouse
          Sam Salmon RE: beachmouse Sep 12, 2011 11:00 PM

          And if they tell you it was a Bigeye and not a Yellowfin will that assuage your fears?

          Chances are it sat in the sun a bit too long and had elevated histamine levels-that's the most common problem-with pelagics-any reputable restaurant would have taken it back and struck it off the bill.

          1. re: Sam Salmon
            u
            uwsister RE: Sam Salmon Sep 13, 2011 08:22 PM

            There's a lot of assumptions being made in this post. I can't say I understand where you are going with it.

            1. re: uwsister
              Sam Salmon RE: uwsister Sep 14, 2011 09:27 PM

              The assumptions are from decades of experience catching/killing/cleaning & eating pelagic fish- Scombroid poisoning is common with pelagics - it affects some people even as they eat what's on the plate.

              hth

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