I wonder is it true??

[qwertman321]

Hi guys... ever wondered why corals in the sea have vibrant color ?

My father friend from manado came to visit our hse that day and i over heard their conversation a little.

I'm not sure how it starts but the guy said something like ... the corals in the sea always have very florascent colors , red , yellow , green , etc. This is becuz at different depth, coral will absorb different amount of UV light from the sun , Thus making the corals extremly bright.

He also said theres once he saw hammer coral blue in color , but he brought back the specimen but slowly, the blue starts to fade away and turn back to green...

So guys.. think its true?

[MOssrope]

Hi guys... ever wondered why corals in the sea have vibrant color ?

My father friend from manado came to visit our hse that day and i over heard their conversation a little.

I'm not sure how it starts but the guy said something like ... the corals in the sea always have very florascent colors , red , yellow , green , etc. This is becuz at different depth, coral will absorb different amount of UV light from the sun , Thus making the corals extremly bright.

He also said theres once he saw hammer coral blue in color , but he brought back the specimen but slowly, the blue starts to fade away and turn back to green...

So guys.. think its true?

the water breaks of the light spectrums... the end of the spectrum colour in light is usually the blue spectrum

which is why our lights for marine usually are blueish to manipulate this effect.

hope this answers your queries.

[LaW]

not just to corals, fishes also.

[qwertman321]

actually i m wondering if UV light will affect the color of the coral?

[cdckjn]

Too much ultra violet can kill your fishes. Remember that there is such a thing as a Ultra-Violet light to purify water (it kills micro-organisms in the water) so too much no good, a little is useful of course as the sun produces UV as well as infra-red as well as the whole spectrum of light which indoors we cannot re-produce with our lighting systems.

[albinosage]

actually i m wondering if UV light will affect the color of the coral?

MOssrope is right. Light is scattered when it penetrates the ocean and the spectrum of colours is absorbed by the water at various depths.

"The long wavelengths of the light spectrum—red, yellow, and orange—can penetrate to approximately 15, 30, and 50 meters (49, 98, and 164 feet), respectively, while the short wavelengths of the light spectrum—violet, blue and green—can penetrate further..." Source article

As for 91Litre's question, UV light will affect not just the colour, but also the health of corals - negatively.

"Corals are very sensitive to UV-A & UV-B light, which can destroy their DNA and RNA. Corals produce colored pigments (blue, purple, pink) in their zooxanthellae cells for protection from the UV light. In nature, UV rays are filtered out by ocean water. The deeper the water, the more UV rays are filtered out of the spectrum. Since corals produce these colorful pigments as a protection from the UV rays striking them, shallow water corals have more colors: More UV, more color; Less UV, less color " Source article

If you are asking whether adding UV lights to an aquarium will make a difference in viewing, UV is not visible to the naked eye!