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Thus, a grass carp, mirror carp, and salmon are kosher, whereas a shark, whose "scales" are microscopic dermal denticles, a sturgeon, whose scutes can not be easily removed without cutting them out of the body, and a swordfish, which loses all of its scales as an adult, are all not kosher. [ 8][ 10][ 11] When a kosher fish is removed from the ...
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 term scale derives from the Old French escale, meaning a ...
African glass catfish ( Pareutropius debauwi) African lungfish (genus Protopterus) Aholehole (genus Kuhlia and family Kuhliidae) Airbreathing catfish (family Clariidae) Airsac catfish (genus Heteropneustes) Alaska blackfish. Albacore. Alewife. Alfonsino.
Nachmanides believed that the restrictions against certain fish also addressed health concerns, arguing that fish with fins and scales (and hence ritually clean) typically live in shallower waters than those without fins or scales (i.e., those that were ritually impure), and consequently the latter were much colder and more humid, qualities he ...
Derived from placoid scales, they have a thick coat of enamel, but without the underlying layer of dentin. These scales cover the fish's body with little overlapping. They are typical of gar and bichirs. Cycloid scales are small, oval-shaped scales with growth rings like the rings of a tree. They lack enamel, dentin, and a vascular bone layer.
Synonyms. Placodermata. Placoderms (from Greek πλάξ ( plax, plakos) ' plate ' and δέρμα ( derma) 'skin') [ 1] are vertebrate animals of the class Placodermi, an extinct group of prehistoric fish known from Paleozoic fossils during the Silurian and the Devonian periods. While their endoskeletons are mainly cartilaginous, their head and ...
The scales of fish provide protection from predators at the cost of adding stiffness and weight. [48] Fish scales are often highly reflective; this silvering provides camouflage in the open ocean. Because the water all around is the same colour, reflecting an image of the water offers near-invisibility. [49]
The bucktooth tetra eats scales off other fishes. Lepidophagy is a specialised feeding behaviour in fish that involves eating the scales of other fish. [1] Lepidophagy is widespread, having evolved independently in at least five freshwater families and seven marine families. [2] A related feeding behavior among fish is pterygophagy: feeding on ...