Reference for Avodah Zarah 77:4
אכריז רבי אבהו בקיסרי קירבי דגים ועוברן ניקחין מכל אדם חזקתן אינן באים אלא מפלוסא ואספמיא כי הא דאמר אביי האי צחנתא דבב נהרא שריא
R. Abbahu announced in Caesarea that fish-entrails and their eggs may be purchased from anybody since the presumption is that they only come from Pelusium and Aspamia. This is like what Abaye said: The small tzahanta fish from the river Bab-Nahara is permitted.
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