Long has there been a stigma against drinking red wine with fish. I doubt this is rooted in a James Bond sort of snobby disdain of an incorrect wine choice, though I have heard many suggest this. It is simply a practical consideration for enjoyment (it's just the cultural elite who regard it as outré). The fact is that a red wine can often make even the freshest fish smell and taste exceedingly "fishy"--a magnification of that decaying smell that should warn you off buying a fish from the market. Most every time I have had this combination, I felt not only did the fish taste awful (if I could even taste it at all), the wine suddenly had a metallic taste: sapped of fruit almost entirely. I would gather that this metallic flavor is a magnification of a wine's iron content. I usually remain sensitive to iron in wine, especially reds, for long periods after such an encounter, as iron (or whatever it is that tastes like it) seems to attach itself to the tannins present in most reds.
This iron-ic transformation happens most obviously with Pinot Noir and Smoked Salmon--this is a dreadful combination, which prompts the most tooth-shocking metallic flavor you would never want to experience. Imagine someone filing madly on your teeth, getting dangerously close to the root, and then deciding to scratch his fingers along a blackboard just for kicks. It's that unpleasant. Actually, pairing Pinot Noir and smoked fish of any kind is usually bad, though lean fish (a speedy swimmer like bluefish) seems to be better.
This same disastrous vinous metamorphosis happens with non-smoked white-fleshed fish and robust red wines, though lighter reds like Pinot Noir can often be just fine. Particularly egregious in this metallic offense are Cabernet Sauvignon, Cabernet Franc (which is usually even worse), Syrah, and Nebbiolo (which can be so bad that one needs no further evidence as to why you might want to avoid the red wine and fish combination). The obvious conclusion is that this means that there is some type of fat that iron latches on to, but I know next to nothing about chemistry, so someone else will have to illuminate this aspect of the issue.
I would imagine that this effect is not so bad in wines with very little iron content, a measure that would vary based on the amount of iron present in the soil on which the vines are planted. However, I have never done (and will probably never do) a study to find out. Sounds like a good idea for a science project--too bad science projects are the province of high school students who are underage.
If you are intent on having red wine with fish (which is just fine with me), go with a wine possessing low tannin: Beaujolais would be ideal. If you are having a more robust red-fleshed fish, by all means, have a red wine. Not that red would naturally be my first choice (it depends upon the situation), but there are many fine combinations here. Tuna, salmon, and brook trout can be quite delicious with Pinot Noir, Beaujolais, and a few less common grape varieties, including one from the heel of the Italian boot, Negroamaro (though it can be quite alcoholic, which can hamper its usefulness), and the famous (if widely considered ignoble) German red Dornfelder (which can actually be a wonderful wine for this purpose, if you can find a good one).
There are exceptions to all of this of course, and I would urge you to experiment with red wine and fish if it intrigues you. I am still intrigued by this to the extent that it happens to come up, but I no longer seek this one out.
If you are seeking good pairings for your fish, there are many, many options listed in the Wine Pairing Search, both white and red wine. As an alternative, you could go do some experimenting as a part of the Wine Pairing Course, and report back your experiences.
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