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True ctenoid scales, where the spines on the scale are distinct structures. Most ray-finned fishes have ctenoid scales. Some species of flatfishes have ctenoid scales on the eyed side and cycloid scales on the blind side, while other species have ctenoid scales in males and cycloid scales in females.
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.
The finescale dace has what are called ctenoid scales, called this because of the cteni that run along the posterior area of the fish. A lateral line system exists on the fish and allows it to orient itself in moving water. Main row teeth are distributed 5–4 usually, but have been seen as 4–4, 4–5, and 5–5 as well. [6]
Acanthomorphs have developed spiny ctenoid scales (as opposed to the cycloid scales of other groups), tooth-bearing premaxilla and greater adaptations to high speed swimming. [ 5 ] The adipose fin , which is present in over 6,000 teleost species, is often thought to have evolved once in the lineage and to have been lost multiple times due to ...
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 projections along one edge.
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 predatory fishes and are capable of swimming into fast currents with minimal drag on their bodies.
These perciform fish, an order of ray-finned fish that are "perch-like", characteristically have teeth fused into a parrot-like beak during adulthood. They diagnostically have a single dorsal fin and body covered in small scales that are known as ctenoid scales .
These scales are a clue that this species is primitive in comparison to other teleosts, many of whom have ctenoid scales. For species of fish with either version of leptoid scales, the age of the fish can be determined by examining the pattern of ridges on a scale, similar to how tree trunk rings display the age of a tree.