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Goldfish don't like to be kept in the dark and, unlike humans, they are able to see ultra-violet and infra-red light . No fish urinate. Instead of expelling ammonia by urinating (as mammals do), fish filter ammonia from the water using their gills.What colour is a goldfish?
All metallic-scale goldfish develop a greenish bronze color during the first weeks of life. This is often called the "wild" color because it is similar to the color of wild Gibel carp. The wild color is produced by a combination of red, yellow and black pigments.