Q:

Why do fish have scales?

A:

Quick Answer

Scales on a fish provide protection. Hard, sturdy and slippery scales prevent damage from sharp objects like coral, and they protect the fish from predators' sharp teeth.

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Why do fish have scales?
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Full Answer

Scales are bony and overlap, which not only protects the fish, but allows a gliding side-to-side swimming motion. The porcupine fish raises its scales to ward off predators. A shark's scales resemble teeth. Catfish and lamprey do not have scales. In addition to scales, fish have two layers of skin. The outer epidermis produces a slimy substance to ward off fungi and bacteria. The inner skin is tough and bony. Rings on a fish scale indicate its age.

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    How accurate are bathroom scales?

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    According to research carried out at the University of New Jersey, digital bathroom scales are quite accurate down to .95 pounds. This does not reflect the accuracy of mechanical scales, which often vary slightly. Usually inaccuracies occur because of human error, rather than a problem with the scales.

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    A:

    All reptiles have scales or scutes that cover their skin, as this is a defining characteristic of the class Reptilia. Reptilian skin is horny and waterproof but lacks the thickness of mammalian skin. In some reptiles, the scales or scutes have a bony base that provides more protection.

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