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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 biblical fish category includes marine mammals. ("Even the sea monsters draw out the breast, they give suck to their young ones..." Lamentations 4:3 A.V. & D.V.) Jonah's fish: According to the Book of Jonah, a "great fish" swallowed the prophet Jonah (Jonah 1:17 A.V.), and he was in its belly for three days, before being vomited up.
Their paired fins are in the thoracic position and their caudal fin is truncated, which means squared off at the corners, a characteristic of the family Percidae. Another physical characteristic of saugers is their ctenoid scales, which are common in advanced fishes. Saugers have a fusiform body structure, and as a result are well adapted ...
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 ...
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On the fish, the opercles (or bony areas forming the gill covers) have scales, whereas the preopercles (bone at the start of the cheek), napes, and breasts are scaleless. The johnny darter has two dorsal fins , the first has hard (spinous) rays, while the second is soft-rayed (flexible).