Shredded pork stir-fried with wood ear mushroom, carrot and often green pepper or bamboo shoot in a sweet, sour, garlicky sauce of pickled chili. 鱼香 names the sauce; there is no fish.
Yuxiang pork is a classic representative of Sichuan cuisine.
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There is no fish in 鱼香肉丝 - the name refers to 鱼香 sauce, the pickled-chili-and-vinegar profile traditionally used in Sichuan to cook fish. The flavor base (pickled chili 泡椒, garlic, ginger, scallion, sugar, vinegar, soy) is what is "fish-flavored," not the protein.