What is ctenoid scales?

What is ctenoid scales?

Ctenoid scales are scales with comb-like edge found in higher order teleost fishes, such as perch and sunfish. Cteni are the tiny teeth on the posterior margin of the scale. Similar to cycloid scales, they are overlapping which allows for greater flexibility in movement than other types of scales such as ganoid scales.

What are cycloid and ctenoid scales?

composition and structure Cycloid scales are large, thin, and round or oval in shape, and they exhibit growth rings. Ctenoid scales are similar to cycloid, except that they have spines or comblike teeth along their free edges; these scales are characteristic of the higher bony fishes—perches and sunfishes, for example.

What are fish scales for?

Many fish have an outer covering of scales. Scales protect fish, much like a suit of armor. All fish have a slimy covering of mucus. This substance allows the fish to swim through the water with very little drag and also makes it difficult for other organism to attach to the fish.

What is cycloid scales in biology?

Cycloid scales appear to be the inner layer of ganoid or cosmoid scales. Found in carps and similar fishes, they are thin, large, round or oval, and arranged in an overlapping pattern; growth rings are evident on the free edges.

What is the use of scales?

Scale, in zoology, small plate or shield forming part of the outer skin layers of certain animals. Scales provide protection from the environment and from predators.

How do scales help fish survive?

Scales protect fish from predators and parasites and reduce friction with the water. Multiple, overlapping scales provide a flexible covering that allows fish to move easily while swimming.

What is the meaning of Ctenoid?

: having the margin toothed ctenoid scale also : having or consisting of ctenoid scales ctenoid fishes.

Where are ctenoid scales found in the body?

They composed of a thin upper layer of bone and a lower layer of fibrous connective tissue. It is found in lung fishes, and several lower teleosts.

What’s the difference between cycloid and ctenoid scales?

Cycloid scales exhibit a smoothly rounded posterior edge, whereas those of the ctenoid variety are characterized by a row of comb-like extensions. Both types line the skin in an overlapping design, but are generally associated with different aquatic species.

How are cycloid scales used to determine age?

CYCLOID SCALES- it is thin, flexible, translucent plates, has circular outline,thicker in centre, and marked with several concentric lines of growth which can be used to determine the age of fishes. They composed of a thin upper layer of bone and a lower layer of fibrous connective tissue. It is fou…

What is the meaning of the word scales?

All rights reserved. plural noun weighing machine, balance, scale, weigh beam I step on the scales practically every morning. a usually small weighing-machine. kitchen scales; a set of scales. Want to thank TFD for its existence?