Pasty cave fish seem to repurpose a melanin-making molecule to better survive famine
Astyanax mexicanus cave fish have adapted to an incredibly tough environment: chilly, pitch-dark caves that flood about once a year, providing brief feasts separated by long periods of starvation. These fish put on fat easily, maintain high blood glucose levels and sleep very little. They also have lost their eyes and coloration. Despite the challenging conditions they live relatively long lives, often reaching 15 years.
“This represents a massive technological advance that will enable future [cave fish] studies,” says Suzanne McGaugh, an evolutionary biologist at the University of Minnesota, who was not involved in the new study, published recently in Nature Genetics.
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