Pelvicachromis taeniatus may sound like an exotic name, but you've probably seen these dwarf cichlids in your local aquarium before. The fish normally dwell in African rivers, but are also popular as fish in domestic aquariums. When they're being fed floating food pellets, though, one of their most interesting evolutionary developments is going to waste. It turns out these cichlids hunt with a highly developed sense of infrared vision.
The Kori no Suizokukan aquarium, located in Kesennuma, Japan, is a little different than your standard, now-boring aquariums: It's inhabitants are frozen in blocks of ice. The aquarium features around 450 specimens (which are flash frozen as they are unloaded at Kesennuma's port) displayed under a moody blue light. The temperature inside the aquarium is a crisp five degrees Fahrenheit, so visitors should probably wear a jacket. Head on past the break to see the rest of the Icequarium.