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I didn't find pictures unfortunately, but sharp heads are just that - like in sharks, while kosher fish have a more rounded head, as their mouths are in the front. The spine means actual bones, as opposed to no bones, or cartilage. Kosher fish will always be from the bony fish family. Some more here and here. But the main point I think, as mentioned in the ...


My answer is lahalocho velo lemaasse - theoretical and not for practical use. Here is a Mishna in Trumoss, perek 10 mishna 4 פרק י - משנה ח דָּג טָמֵא שֶׁכְּבָשׁוֹ עִם דָּג טָהוֹר, כָּל גָּרָב שֶׁהוּא מַחֲזִיק סָאתַיִם, אִם יֶשׁ בּוֹ מִשְׁקַל עֲשָׂרָה זוּז בִּיהוּדָה שֶׁהֵן חָמֵשׁ סְלָעִים בַּגָּלִיל {ז} דָּג טָמֵא, צִירוֹ אָסוּר. רַבִּי יְהוּדָה אוֹמֵר, ...


As always, the answer is: "it's a machlokes!" Open up a Shulchan Aruch to Yoreh Deah 116:2, where it says not to mix meat and fish. The Taz's opinion is that because meat-and-fish is a health concern, we are stricter about it than normal kashrus prohibitions, therefore if you pour one ounce of fish juice into a hundred ounces of beef broth, you may not eat ...


Bittul b'shishim only works when the ingredient is not essential to making the thing and is not intentionally added.

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