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1 .This is Scientific American 60-Second Science. I'm Sophie Bushwick.Got a minute?
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2 .In the east African savanna, pools of water form during the rainy season only to dry up a few months later.
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3 .Being a fish in one of these temporary ponds is a challenge.
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4 .To survive, they race to maturity, with the shortest generation time of any vertebrate.
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5 .To monitor the development of the so-called annual fish, researchers raised two different species in the lab.
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6 .The fish could grow by almost a quarter of their body length each day.
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7 .One species could already reproduce at 17 days of age.
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8 .The other took an additional day.
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9 .The eggs these youngsters fertilized then hatched in as little as 15 days, leaving only a month between generations.
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10 .The study is in the journal EvoDevo.
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11 .Embryonic annual fish survive the dry season by lying dormant underground.
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12 .Once the rains return and the pool forms, they quickly reproduce before the water dries up again.
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13 .Their short generation time is thus a crucial evolutionary adaptation.
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14 .Their temporary ponds force them to live fast, die young and leave a desiccated corpse.
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15 .Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.
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