Why do goldfish lose their color?

Answer

Goldfish normally lose their colour because of the change of the environment, the temperature of water and the introduction of other fish or goldfish into the aquarium. In addition, they can change their colour when they grow old.
Q&A Related to "Why do goldfish lose their color?"
According to the Goldfish and Aquarium Board, biologists identify two types of color change in fish: physiological and morphological. Physiological change occurs when certain organelles
http://www.ehow.com/about_6701131_do-change-color-...
When a goldfish turns black, it can be a sign of healing. Similar to bruising on a human, this means they are getting better, and will turn back to gold, once they are better.
http://www.ask.com/web-answers/Science/Nature/why_...
Colour loss in goldfish is usually associated with poor condition. This is usually caused by poor living conditions and insufficient water changes.
http://wiki.answers.com/Q/Why_do_goldfish_lose_the...
Goldfish will lose their color if they are kept in dim
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