Ctenoid scales are typical chiefly for higher bony fishes, such as the Perciformes, but they also occur in fishes of a lower organizational level (for example, in some Clupeiformes and Gadiformes).

The exposed portion of scale is covered with a layer of hard enamel to minimise wear and tear.There is a range of variety of scales found in fishes. Each scale is made of dentine that is secreted by dermal papilla which is a group of specialized cells capable of drawing nourishment from neighbouring tissues to produce an organ. Ctenoid: These scales are thin and round and rimmed with an outer edge of teeth. It is supposed that the spikes on ctenoid scales improve the hydrodynamic properties of the fish’s body. They have a bony basal layer, a layer of dentin (also found in human teeth), and an outer layer of ganoine which is the inorganic bone salt for which these scales are named. Typically fishes with soft fins have these types of fish scales. These scales are characteristic of modem … Cycloid scales are most often found on advanced fish species, such as trout, herring, and carp. PLACOID SCALES- found only in elasmobranch fishes. Positive. Scales of fishes are of different type . Ctenoid scales are scales with comb-like edge found in higher order teleost fishes, such as perch and sunfish. Ctenoid Scales: The ctenoid scales are also circular and can be distinguished from the cycloid scales by having a more or less serrated free edge. gill filaments.

They are smooth and … They have backwardly directed spines arising from a rounded basal plate embedded in dermis. Scales are more frequently transparent, but in some species scales can have pigmentation dots, for example on rainbow trout (scale on the left below).

On the basis of shape, scales are of four types: (i) Plate like or placoid scales commonly found in Elasmobranches. The primary types of fish scales include placoid, cosmoid, ganoid, ctenoid, and cycloid scales. Cosmoid scales are similar to placoid scales and probably evolved from the fusion of placoid scales. Preparation: Remove a few cycloid scales from a carp or a few ctenoid scales from a koi (Anabas) fish. Cycloid scales are thin, circular scales covered by a thin layer of epidermis and mucus. There are four major groups, one of which is comprised of cycloid and ctenoid scales. Scales of fishes are of different type . In fish: The skin. Under this is a cosminelike layer and then a vascular bony layer.

... cycloid or ctenoid scales, thin flexible and overlapping the mouth is usually terminal ... a series of bony "loops" present in fish, which support the gills. The surface layer of the scale is comprised of calcium-based salts and the … Some fishes like sole have ctenoid scales on the 'eyed' side of their body and cycloid scales on the other side. a. A clown fish has the normal parts most fish have, such as gills, scales, fins, a head, and body with tail. In ganoid scales the hard outer layer is different chemically and is called ganoin.

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