Commentary for Chullin 224:9

אי בכלי שאינו מנוקב אפי' עופות ועופות נמי אסירי

then fowl with other fowl would also be forbidden, and if the vessel was perforated then even fish with fowl should be permitted? - Indeed the vessel was perforated, but fish, having a soft skin, very quickly exude [their juice], whereas fowl are constricted and exude [blood] long after the fish have ceased to do so, so that the latter will absorb from [the fowl].<span class="x" onmousemove="('comment',' On the other hand meat with other meat may very well be salted together, for each piece will take an equal length of time to exude the blood and so long as it exudes it will not absorb.');">⁶</span>

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