That's acidity, particularly when you experience it with a sides for the tongue. As we've suggested, a little knowledge goes longer way, and, for some us, it's all we need in an effort to fully enjoy our wine experience. Another approach is to try poaching the fish within a saucepan of wine. https://cyan-lark-kbzsw4.mystrikingly.com/blog/the-storage-of-wine-has-not-changed-much-in-300-years