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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 Yitzhak Yaacov Fuchs writes (in his book Hakashrut, p. 418)

Lchatchilah, it is forbidden to put meat and fish together in the same baking compartment in the oven even though each one is in a separate baking utensil. It would be permissible if one of the baking utensils was covered entirely in a complete manner (wrapped all around and hermetically closed). Bdieved [after the fact] if not fat or juices dropped from one utensil to the other it is permissible to eat both foods (Aruch Hashulchan YD 116:10)

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

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  • "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, 2018 at 13:52
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    "halachically safer" what does this mean?
    – Double AA
    May 18, 2018 at 14:28
  • @DoubleAA interestingly I saw now that the Tur 116:1 mentions that some have the custom to have fish-specific dishes (ויש מחמירין בדבר לייחד לדגים כלים לבד). The Beit Yosef and SA don't pick it up. I leave it here for reference
    – mbloch
    May 1, 2019 at 10:18
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Kitzer Shulchan Aruch Siman 33:1

One should not roast meat together with fish in one oven if the oven is small, unless one of them is covered, [for otherwise the aroma of one gives flavor to the other.]

See Rama, Yoreh Deah 116:2 (see also Taz and Shach there)

But in out ovens that are large, this is no need to be concerned.

The footnote here says that the author is speaking of ovens in his day and a rabbinic authority should be consulted to be determine whether one's oven is large in this respect.

In conclusion, one of the dishes needs to be covered, unless according to a rabbinic authority, your oven is large.

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All other answers offered, take the tact that it is a granted that it is contemporaneously forbidden to eat meat and fish together. It is worth noting that this assumption is not universal.

There are today Ashkenazim and Sefaradim that understand there to be no prohibition extant and therefore do not refrain from eating meat/fish. And all the more so would certainly not refrain from cooking them in the same oven.

For a great analysis of this issue, see R. Zekharyah Zaramati's responsum here.

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    Seems more like a comment as the question is pretty clearly asking according to the other (more common) view.
    – Double AA
    Sep 20 at 15:17
  • @DoubleAA if it is only seeking one particular subview, then that should be specified in the OP. Otherwise, IMHO this is a legitimate answer (i.e. that yes, cooking meat/fish together in the same oven at the same time is permitted). Sep 20 at 15:39
  • How explicit does an OP need to be?? "Is corn forbidden as kitniyot?" "Rav Yosef Karo rules kitniyot are permitted and that would include corn."
    – Double AA
    Sep 20 at 15:43
  • IMHO: If seeking answers specific to those that customarily refrain from it, that would be better worded as "According to those whose custom it is to forbid kitniyot, does corn fall within its purview?" (or something to that effect) As worded, it would indeed appropriately be open to that type of answer. Sep 20 at 22:33
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    That's a highly unreasonable standard. Not everyone even knows certain things which are an essential to the question are subject to dispute. How do you expect someone to write a question? "According to positions that view halacha as binding, can I, according to those who think I'm not a slave, eat food, according to those who view things consumed as food, on saturday, according to those who view shabbat on saturday?"
    – Double AA
    Sep 20 at 23:30

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