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Scraping fish with a finger nail?

I heard that a kosher type fish bought from a grocer that has also non-kosher fish, that scraping it with a finger nail where the blade cut makes it good to eat. What is the source for this idea?
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Non-kosher, non-Jewish-run, Sushi Restaurants

Is the food served at a non-kosher, non-Jewish run sushi restaurant considered non-kosher because of the non-kosher-ness of the knives, the bishul akum of the rice, or both?