To what extend fish scales interaction with internal body media of the fish?

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Ahmad Al Khraisat

Fish scales primarily serve two purposes: protection and locomotion. What distinguishes these various scales from each other is both their composition and how they balance those two functions. The more ancestral a scale, the better its configuration is for protection rather than locomotion

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8467489/

https://www.nature.com/articles/srep07454

https://www.colorado.edu/lab/barthelat/sites/default/files/attached-files/ab2021.pdf

Article Teenage Mutant Zebrafish: Scales Transform the Skin as Fish ...

file:///C:/Users/JICA-PC/Downloads/fishes-07-00145.pdf

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjaov7K9dL7AhV7TKQEHZuvBsQQFnoECDoQAQ&url=https%3A%2F%2Fwww.mdpi.com%2F2410-3888%2F7%2F4%2F145%2Fpdf&usg=AOvVaw1A6MRbWFfPfzUegTLm2Z8D

They are made up of lamellar bone and connective tissue called isopedine. The plates overlap each other. The free end of the scale points out to the tail of the fish. The scales are anchored by the body by the anterior end of the scale, either embedded into the flesh or attached internally by bone.

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https://www.jstage.jst.go.jp/article/jsmec/45/4/45_4_1100/_pdf

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Fish scales are an important part of a fish's body and have various functions that help the fish to survive and thrive in its environment. Scales interact with the internal body media of the fish in several ways:

Protection: Scales provide physical protection for the fish's body by covering and shielding the skin and underlying tissues from external damage or injury. Scales also help to protect the fish from predators by making it more difficult for the predator to bite or grasp the fish.

Streamlining: Scales help to streamline the body of the fish, reducing drag and allowing the fish to swim more efficiently through the water. The smooth, overlapping arrangement of scales on the body of the fish helps to minimize turbulence and reduce the resistance that the fish encounters as it moves through the water.

Water balance: Scales help to maintain the water balance of the fish's body by regulating the exchange of water and electrolytes between the fish's body and the surrounding water. The scales of some species of fish are equipped with specialized cells called osmoregulatory cells that help to maintain the balance of water and electrolytes in the fish's body.

Sensory perception: Scales can also play a role in sensory perception in fish. Some species of fish have specialized scales that are sensitive to touch, pressure, or vibrations, and these scales can help the fish to detect predators or prey and to navigate through their environment.

Overall, fish scales have a range of functions that help to support the health and well-being of the fish, and they interact with the internal body media of the fish in various ways to support these functions.