Commentary for Avodah Zarah 77:7
אמר אביי האי חמרא דימא שרי תורא דימא אסיר וסימניך טמא טהור טהור טמא
Abaye said: The sea-donkey is permitted, the sea-ox is prohibited; and an aid to the memory is the unclean [on land, the donkey] is clean [in the water] and the clean [on land] is unclean [in the water].
Daf Shevui to Avodah Zarah
Here rabbis list fish and provide some mnemonics to remember which one is kosher and which one is not.
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