Commentary for Avodah Zarah 79:4
אמר רב פפא הלכתא עד שיהא ראש ושדרה ניכר של כל אחת ואחת מיתיבי חתיכות שיש בהן סימן בין בכולן בין במקצתן ואפילו באחד ממאה שבהן כולן מותרות ומעשה בעובד כוכבים אחד שהביא גרב של חתיכות ונמצא סימן באחת מהן והתיר רשב"ג את הגרב כולו
R. Papa said: The halakhah is that both the head and backbone of each fish must be recognizable. They objected: Pieces of fish which have a sign [that the fish was of a clean species] whether in all of them, some of them or even in one in one hundred, they are all permitted. And it once happened that a non-Jew brought a barrel containing pieces of fish and a mark [of it being clean] was found in one of them and Rabban Shimon b. Gamaliel declared the whole barrel to be permitted!
Daf Shevui to Avodah Zarah
R. Papa had said that the head and spine of each and every fish must be recognizable. But the baraita seems to imply that even if only one in an entire barrel is recognizable, they are all kosher.
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