ACTH is a segment of a much larger glycoprotein prohormone molecule called proopiomelanocortin (POMC). POMC is synthesized by the corticotrophs of the anterior pituitary, which constitute about 10 percent of the gland.
Caviar harvested from an older fish is the more rare, and more sought after, white caviar. The Beluga sturgeon are primarily found in the Caspian Sea, which is surrounded by Iran, Azerbaijan, Russia, Kazakhstan and Turkmenistan. The other primary source of Beluga sturgeon is the Black Sea near Russia and Romania.
All forms of caviar come from fish that take a long time to mature, which means that it takes a while for populations to rebound. Eat this instead: If you really love caviar, opt for fish eggs from American Lake Sturgeon or American Hackleback/Shovelnose Sturgeon caviar from the Mississippi River system.