Caviar sturgeon from the Sea of Azov began reaching the tables of aristocratic and noble Byzantine Greeks in the 10th century, after the commencement of large-scale trading between the Byzantine Empire and Kievan Rus'. The main types of caviar are Beluga, Sterlet, Kaluga hybrid, American osetra, Ossetra, Siberian sturgeon and Sevruga. The rarest and costliest is from beluga sturgeon that swim in the Caspian Sea, which is bordered by Iran, Kazakhstan, Russia, Turkmenistan, and Azerbaijan. Wild caviar production was suspended in Russia between 2008 and 2011 to allow wild stocks to replenish. Azerbaijan and Iran also allow the fishing of sturgeon
Great Lakes Aquarium was designed after a cove in Pukaskwa National Park in Ontario. Directly to the left is an exhibit containing a crow named Freeway. Amazing Amazon opened in the summer of 2008. It features freshwater creatures from the largest river in the world. This includes Pacu, Arowana, Piranha, Catfish, Electric Eels, Discus. Opened in 2016, Unsalted Seas explores large lakes of the world and the animals that call them home. The exhibit features the largest sturgeon touchtank in North America with a primary focus on sturgeon from Russian and North Asian waters. Several species of those sturgeon including Beluga, Sevruga, Sterlet