Buying fish without a kosher symbol - Part 2

Buying fish without a kosher symbol - part 2

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What precaution should one take when buying fish without kosher certification?

In a supermarket where they sell both kosher and non-kosher fish, there is a concern that the same knife may have been used to cut the kosher and non-kosher fish. Therefore, one should rinse the fish and rub against it with the back of a knife to ensure that no fat or residue of a non-kosher fish are stuck to it.

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