Why do fish have scales?

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.

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.

Q&A Related to "Why do fish have scales?"
Cycloid scales are a bit like tree trunks. As they age, they form concentric circles. When held up to the sun, the light diffracted through these rings produces a slight iridescence
http://www.ehow.com/about_5063644_fish-scales-used...
They were put in a nice order from God in the fish's body. God put the scales there like He put skin on us to protect us from getting hurt easily.
http://wiki.answers.com/Q/How_are_fish's_scales_pl...
1. Take the girth measurement. You need to measure the fish's girth by wrapping the measuring tape around the widest part of the fish. Take that measurement and square it. Ad. 2.
http://www.wikihow.com/Calculate-a-Fish's-Weight-W...
The gills will impart a bitter flavor to your fish, and will make it spoil faster, so they need to go. You can most easily do this by cutting them where they attach at either end
http://fishcooking.about.com/od/wholefishrecipes/s...
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