Friday Fish Post: Researchers track cool-water habits of Willamette fish

http://www.oregonlive.com/news/index.ssf/2008/09/researchers_track_coolwater_ha.html

From the article:

“Researchers have realized that water winding through the network of channels also passed underground through gravel and sand in what is known as hyporheic flow. The flow is a natural form of refrigeration because the water cools as it passes through the ground. “

“Studies have found that migrating fish duck into such water to cool themselves before racing through warmer stretches. “

That is so cool! Sorry for the pun I couldn't help it.