Appraisal changes a fish you already own; it does not catch a new one or promise a higher sale price. This PC guide covers the normal Moosewood Appraiser, not the separate Treasure Island minigame.
Keep a quest fish or a mutation you want to save out of this experiment. On PC, press G to open the dark fish-inventory grid, then right-click a fish tile to add its star. The star keeps that fish out of bulk selling, but it does not protect a fish you deliberately hand to the Appraiser.
















