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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
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ScienceShot: Why Fish Haul Around Extra Guts
6 July 2011 1:00 pm
Put a fish in a tank with unlimited food and it will gobble until it grows many times its size. This is possible because the fish has a much larger digestive system than it actually needs. But why spend so much energy maintaining all of these guts when fish in the wild don't eat nearly as much? A new analysis of 600 fish populations (including the bluegill, pictured), reported online today in Nature, suggests that large guts help fish deal with feast or famine conditions in the wild. A digestive system that's two or three times bigger than needed helps these fish gorge on food when they find it and store the calories for times when food is scarce. And, in the long run, that makes hauling around a bunch of guts worthwhile.
See more ScienceShots.