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.
There is a misconception that caviar is the roe or eggs of big fish species. But there is more to caviar than the plain fish roe we see as the caviar we know is made from fish roe which is washed, brined, packed in tin cans and aged until such time it is served in the tables of the rich and famous.