[keithgabryelski]

meh, this seems to be equivocation. basically, warm blooded (and cold-blooded) are no longer used (because they found animals didn't cleanly fit into the features of each), so they have a bunch of other words that describe the components of blooded-ness -- like, does the animal maintain a specific body temperature, does it use heat to convert sugars into (ATM) energy. What they've found is the first fish to warm water on entry to gills so that THAT water doesn't bring the temperature of the fishes body down too low.

meh

[DougBTX]

Basically yes, though according to the article the fish is heating cold blood with warm blood, not the water passing through its gills.

Like birds legs: http://askanaturalist.com/why-don’t-ducks’-feet-freeze/