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Most people do not think that portobello mushrooms smell like fish. It may be that your mushrooms were cooked in oil that was previously used for fish, or were stored in a refrigerator or container that retained a fishy odor. Another reason could be that the portobello mushrooms that you used were old and had been stored in a plastic bag. When mushrooms get older they can release amines which are what makes up a fishy odor.

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11y ago

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