That's acidity, particularly when you experience it of the sides within the tongue.
As we've suggested, a little knowledge goes quite some way, and, for most of us, it's all we need to be able to fully enjoy our wine experience. Another method to try poaching the fish within a saucepan of wine. https://objectstorage.ap-singapore-1.oraclecloud.com/p/avZDPQ31gLG97wBT7D92IUjmvPnQijJHV0zMm7ZHU_fTxNyxRzvkYgvGUKmCwJx2/n/axqjqojndoew/b/Ruou-tay/o/KynangkethopruouHennessyvadoanduongpho.docx.html