Rav Kana taught that if one bakes bread in an oven with roasted meat, one cannot eat this bread with dairy. Further on the Gemara in Pesachim writes that Rava B’Parziska prohibited consuming fish that had been roasted in an oven with meat, together with dairy. Mar B’rav Ashi adds that one should not even eat the fish itself because it causes bad breath and tzoraat.
The Shulchan Aruch develops this halacha further and writes that not only may one not eat fish roasted in an oven with meat, but one should refrain from eating fish and meat altogether.
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