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A goldfishes colour does not help it survive. The goldfish is a man developed (through selective breeding) species and did not evolve naturally. When they are released in the wild, they breed and the brighter coloured ones get eaten more readily because they are relatively easy to see. This eventually (over the years) makes the species slowly return to their original colouring which is a drab green/brown on the back with a silvery belly.

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15y ago

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