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Welcome to Stuff to Blow Your Mind, a production of IHeart Radio.

Hey, welcome to Stuff to Blow Your Mind.

My name is Robert Lamb.

And I'm Joe McCormick, and we're back with part two in our series on fishes of gold, the orange, yellow, and golden-colored fishes in the carp family, such as the goldfish and its close relative to the Crussian carp, and the varieties of cultivated carp known as coy fish. In the previous episode, we talked about the carp family and its historical role in human

aquaculture, about how orange, gold, and yellow colors of goldfish today are mostly a result

of artificial selection by humans that goes back more than a thousand years in China. And we also

talked about how, despite the fact that the color of the goldfish is a mostly

human selected trait, there are some reasons that animals in nature develop bright, orange,

and yellow colors, including some cases of intra-species communication, like signaling of reproductive fitness or just self-recognition within a species,

...