That's acidity, particularly when you experience it of the sides with the tongue. As we've suggested, a little knowledge goes some way, and, for many of us us, it's all we need in an effort to fully enjoy our wine experience. Another way is to try poaching the fish in the saucepan of wine. https://saveyoursite.date/story.php?title=five-a-little-gem-for-wine-tasting-with-new-clients