(May 17, 2015 at 5:03 am)downbeatplumb Wrote: http://www.bbc.co.uk/news/science-enviro...ef=Default
Quote:The large and colourful opah has become the first known "warm-blooded" fish, as scientists discovered it can regulate the temperature of its whole body.
The opah traps warmth from its flapping fins, which are well insulated by fat.
It uses that heat to keep its heart, brain and other organs warm while it swims to depths of hundreds of metres.
Other fish like tuna can warm specific body parts, boosting performance at key times, but whole-body "endothermy" has not been observed in a fish before.
Silly hype. Exercising to keep warm is something any animal can do. Real endothermy is based on special mitochrondria adaptation that allows the animal to generate body heat without exercising.
