Is Swordfish Kosher?

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Note: Due to the post being deemed too controversial for the Kosher consumer, as well as politically charged, the original post appears to have been removed from the Jewish Press website. Interestingly, Natan Slifkin’s piece on swordfish remains. – RH

Is Swordfish Kosher?

By Rav Hershel Schachter – 5 Iyyar 5778 – April 19, 2018

he commentaries on the Shulchan Aruch say dag ha’cherev[literally, “the fish of the sword”] is kasher.

Why is it widely considered to be not kosher, then?

Because around 60-70 years ago, they asked Rabbi [Moshe] Tendler if he could make a list of which fish are kosher and which aren’t. Rabbi Tender decided to list swordfish as a treife fish because he called up an expert who told him scales on a swordfish are a different consistency – or something like that – from those of other fish. So he decided it was a treife fish.

But that’s absolutely not correct. The commentaries on the Shulchan Aruch say dag hacherev is kasher. Professor [Shlomo] Sternberg, a big genius in learning and math, published an essay maybe 20 years ago in which he writes that Rabbi Soloveitchik asked him to conduct research on the status of swordfish. He did. He showed Rabbi Soloveitchik the scales of a swordfish and Rav Soloveitchik said, “It’s a kashere fish!”

Professsor Sternberg writes that he still has the envelope with the scales he showed Rav Soloveitchik in his Gemara Chullin.

If the commentaries on the Shuchan Aruch say dag ha’cherev is kosher, how can Rabbi Tendler claim it isn’t?

Rabbi Tendler claims “dag hacherev” is a different fish. It’s not true.

But Rabbi Tendler did a service to the Orthodox Jewish community because at the time there were Conservative rabbis who were giving hashgachas, so he laughed them out of existence and said they don’t know what they’re talking because [they were giving swordfish a hechsher when] swordfish is really treif. So the Orthodox realized you can’t rely on the Conservatives.

L’maaseh, the Conservatives were right on this issue, but Rabbi Tendler accomplished his goal.


Rav Hershel Schachter is a widely-respected posek and a rosh yeshiva and rosh kollel at Yeshiva University’s Rabbi Isaac Elchanan Theological Seminary. To suggest a topic you’d like to see Rav Schachter address in this column, e-mail