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Scientifically, there are five different types of fish scales: placoid, cosmoid, ganoid, ctenoid and cycloid. The majority of kosher fish exhibit the latter two forms, ctenoid or cycloid, but the bowfin (Amia calva) is an example of a fish with ganoid scales that is deemed kosher. As such, kosher status cannot be said to follow the rules of ...
All true fish with scales have fins, but the converse is not true. All fish in this article have true (visible) fish scales, an endoskeleton, fins, and gills (as opposed to lungs). The requirement for gills is not part of any religious rule, but biologically it is an identifying characteristic of true fish. Any animal lacking any of the latter ...
By these requirements, fish are the only possible kosher water-dwelling creatures. Because all creatures possessing both fins and scales also possess an endoskeleton and gills, any creature possessing lung or an exoskeleton is not kosher. As every fish possessing scales also possesses fins, any water-dwelling creature possessing scales is ...
The Jewish laws of kashrut, which only permit the consumption of fish with both scales and fins, forbids sturgeon, as they have ganoid scales instead of the permitted ctenoid and cycloid scales. While all Orthodox groups forbid the consumption of sturgeon, some Conservative groups do allow it. [ 69 ]
Also part of the fish's integumentary system are the scales that cover the outer body of many jawed fish. The commonly known scales are the ones that originate from the dermis or mesoderm, and may be similar in structure to teeth. Some species are covered by scutes instead. Others may have no scales covering the outer body.
Paired fins behind or below the pectoral fins. pharyngeal bones Bones behind the gills in the oesophagus or gullet. pharyngeal teeth Teeth within the pharynx. pharynx The back part of the throat, into which the gill slits open. photophore A circular light-producing organ on the surface of a fish. placoid scales Teeth-like scales found in sharks ...
A fish scale is a small rigid plate that grows out of the skin of a fish. The skin of most jawed fishes is covered with these protective scales, which can also provide effective camouflage through the use of reflection and colouration, as well as possible hydrodynamic advantages.
The following year, Rabbi Yosef Kanowitz published the same list of kosher fish with swordfish still included. Swordfish was widely considered kosher by halakhic authorities until the 1950s. Orthodox opinion began to shift in 1951, when Rabbi Moshe Tendler examined swordfish and decided it was not kosher due to the lack of scales. Tendler's ...