When I was in rabbinical school, I only studied the laws of milk and meat mixtures with Dr. José Faur. Ritual slaughtering , shekhita, was not in the course syllabus. Although two of my fellow students and their own studied how to slaughter correctly chickens with Dr. Zucker. They passed the exams, but I never learned whether they continue along this side gig in the rabbinate.
For a kosher animal shekhita, the shoket, the ritual slaughterer, needs to slice through the majority of both the windpipe and esophagus. For a kosher bird shekhita, the shoket has to slice through the majority of either the windpipe or the esophagus. Although I knew that animals and birds needed to be richly slaughtered and fish were exempt, I never knew the reason why fish were exempt until I studied yesterday’s daf TB Khullin 27b.
“The Gemara proceeds to discuss the source for the slaughter of non-sacred birds. Bar Kappara teaches that the verse states: “This is the law of the animal, and of the bird, and of every living creature that moves in the waters, and of every creature that swarms upon the earth” (Leviticus 11:46). The verse situated the bird between the animal and the fish. To require the cutting of the two simanim that must be severed in ritual slaughter, i.e., the windpipe and the gullet, for the slaughter of a bird, is impossible, as it was already juxtaposed to fish, which do not require slaughter at all. To exempt it with nothing, i.e., to exempt the bird from slaughter altogether, is impossible, as it was already juxtaposed to the animal. How, then, is fitness of a bird for consumption accomplished? It is rendered fit with the cutting of one siman… (In other words based on this verse,when it comes to birds the Rabbi split the difference between the two simanim of the animals and fish which do not require slaughter at all.-gg)
“The Gemara asks: From where do we derive that fish are not subject to slaughter? If we say that it is because it is written: “If flocks and herds be slaughtered for them…or if all the fish of the sea be gathered together for them, will they suffice them” (Numbers 11:22), which indicates that mere gathering suffices for them, that is not a proof…
“The Gemara relates that a passerby from
the Galilee taught: Fitness for consumption of animals, which were
created from the dry land, is accomplished through cutting two
simanim, the gullet and the windpipe. Fitness for consumption
of fish, which were created from the water, is accomplished with
nothing, as no slaughter is required. Fitness for consumption of birds,
which were created from mud [harekak], a combination of dry land and
water, is accomplished through cutting one siman. Rav Shmuel
of Cappadocia says: Know that birds were created from a combination
of dry land and water, as they have scales on their feet like fish.” (Sefaria.org translation)