July 20, 2013   16 notes

Fading Black Fish: Metallic-scaled goldfish have a tendency to lose black pigment (melanin) as they mature - the striking black shading of many fish is fated not to last. Red pigment, however, stays strong for as long as the fish is healthy.

   On the left are some black-shaded fish currently at auction on dandyorandas.com - on the right are approximations of what these fish’s markings would look like without melanistic shading, if they were to fade.

This does not apply to nacreous (calico) fishes.

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