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The gemara in Pesachim 76b forbids one from cooking meat and fish together because of danger.

But can one cook meat and fish dishes separately at the same time in the same oven? There can be a need to do this when preparing lots of food at the same time, e.g., before a 2-day holiday.

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Many halachic decisors permit cooking meat and fish dishes simultaneously provided at least one of them is covered (SA YD 108:1). After the fact, it is permitted to eat the food even if not covered (Rema on SA YD 116:2).

DailyHalacha writes

When meat and fish are cooked together in a closed area, the steam produced by one is absorbed by the other. Therefore, one should avoid cooking meat and fish together in an oven or closed grill, unless the fish or the meat is covered, such as with aluminum foil and the like, so that it is shielded from the steam produced by the other. Nevertheless, after the fact, if one did cook fish and meat together in an oven without covering one of them, they are permissible for consumption.

dinonline brings the following

Although the Gemara (Pesachim 76b) does imply that it would a problem, even bedieved, to cook meat and fish together in the same oven, the fact that this halachah is not ruled by Rif or Rambam has led poskim to be lenient. Although we continue to be careful not to eat fish and meat together, many authorities are lenient concerning fish or meat that absorbed the taste (alone) of the other.

For lenient opinions, see: Issur Ve’heter 39:25, as cited in Rema, Yoreh De’ah 116; Shach, Yoreh De’ah 116:1; Taz, YD 95:3; Darchei Teshuvah 116:16 (quoting from several authorities); Ha’elef Lecha Shlomo 312. For more stringent opinions, see Peri Chadash (116:4); Peri Toar (116:3); Chochmas Adam (68:1).

Lechatchilah, one should not cook meat and fish [uncovered] in the same oven, but bedieved, one may rely on the lenient opinions.

R Ari Enkin summarizes

This would logically extend to restrict baking dishes with these two types of foods in the oven at the same time, unless both pots are well covered, lest any tastes, via the steam, spread from one to the other.

See also here at length from Eretz Hemda which concludes

while it is halachically safer to not roast meat and fish uncovered in the same oven, it seems reasonable to do so in a regular, large oven when there is a need

  • "many authorities are lenient concerning fish or meat that absorbed the taste (alone) of the other" Indeed almost no one has separate pots for cooking fish – Double AA May 18 '18 at 13:52
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    "halachically safer" what does this mean? – Double AA May 18 '18 at 14:28

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