Show sample as: 72-frame QuickTime VR or 360-frame QuickTime movie loop.    My periodic table poster is now available! Sushi Roll. Fish, particularly fatty fish like tuna, tends to contain mercury, largely as a result of contamination from coal burning power plants. The higher the fat content, the more mercury, and in the case of sushi, the higher the price. Source: Nick Mann Contributor: Theodore Gray Acquired: 13 June, 2009 Text Updated: 14 June, 2009 Price: $5 Size: 1" Purity: <0.001%