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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.
Cycloid scales have a smooth outer edge, and are most common on fish with soft fin rays, such as salmon and carp. Ctenoid scales have a toothed outer edge, and are usually found on fish with spiny fin rays, such as bass and crappie .
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. Bowfin and remora have cycloid scales. Ctenoid scales are similar to cycloid scales, also having growth rings, lack enamel, dentin, and a vascular bone layer. They are distinguished by spines or ...
With small cycloid scales, clinoid blennies may have a deep or slender build; some members of the family bear the name "snake blenny" and "eel blenny" for this reason. Dorsal spines outnumber soft rays; two spines are in the anal fin.
Bony fish do not have placoid scales like cartilaginous fish, instead they consist of three types of scales that do not penetrate the epidermis in the process. The three categories of scales for Osteichthyes which are cosmoid scales, ganoid scales, teleost scales.
However, many loaches are eel-like or conversely, quite stout-bodied; some balitorids have large, visible scales. [10] Loaches in the families Cobitidae, Botiidae, and Serpenticobitidae possess a bifid, protrusible spine below the eye, or in the case of the genus Acantopsis, between the eye and the tip of the snout. [11] [12]
The goldeye fish has cycloid scales that lack spines. They also have a sensory system known as the lateral line system. [4] Adults are usually about 15–17 inches (380–430 mm) but can reach 20 inches (510 mm). Goldeyes typically weigh only 1–2 pounds (0.45–0.91 kg). [8]
The fish is covered with cycloid scales. The scales on the chub's dorsal section, or top of the fish, have brown pigment. [ 3 ] The scales on the ventral section, or bottom of the fish, lack pigment and are white in appearance.