Commentary for Avodah Zarah 79:14
ולרבי דוסתאי דמן בירי דאמר סמי מכאן עוברן
But as for R. Dostai from Biri who said that the word “roe” should be struck out,
Daf Shevui to Avodah Zarah
R. Dostai held that non-kosher fish do not lay eggs and therefore the word should be erased from Rav’s statement. But the baraita above which notes the different shapes between kosher and non-kosher roe assumes that non-kosher fish do lay eggs.
R. Dostai would answer by correcting the baraita in a different way. So if we’re going to correct it, rather than correcting it to read “fish eggs” correct it to read “fish entrails.” Now the baraita explains how to identify kosher fish entrails. But are fish entrails round and pointed? The answer is that the bladder of a kosher fish does indeed have this shape.
R. Dostai would answer by correcting the baraita in a different way. So if we’re going to correct it, rather than correcting it to read “fish eggs” correct it to read “fish entrails.” Now the baraita explains how to identify kosher fish entrails. But are fish entrails round and pointed? The answer is that the bladder of a kosher fish does indeed have this shape.
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