Sterlet

Minimum Tank Size: 180 gallons
Care Level: Easy
Temperament: Peaceful
Water Conditions: 52-72° F, KH 10-18, pH 7.5-8.0
Maximum Size: 4 ft.
Diet: Carnivore
Compatibility: Not found :'(
Origin: Not found :'(
Notes: These fish are a fish normally found in lakes and deep rivers, and should be kept in an aquarium where lots of rocks and crevasses are present. These fish can be kept in a large, deep pond. Feed these fish meaty foods, frozen, freeze-dried, or live foods, and pellet food that sinks   

Picture: http://www.hlasek.com/acipenser_ruthenus_hf5908.html
Info: http://www.liveaquaria.com/product/prod_display.cfm?c=830+836+2533&pcatid=2533