Common bleak extracted from the scales of the common bleak, so-called "Essence Orientale" or "pearl essence", (used in making artificial pearls) which is crystalline guanine. Common bleak The common bleak ("Alburnus alburnus") is a small freshwater coarse fish of the cyprinid family. The body of the bleak is elongated and flat. The head is pointed and the relatively small mouth is turned upwards. The anal fin is long and has 18 to 23 fin rays. The lateral line is complete. The bleak has a shiny silvery colour; and the fins are pointed and colourless. The maximum length is approximately 25 cm. In
Red king crab Red king crab The red king crab, Paralithodes camtschaticus, also called Kamchatka crab or Alaskan king crab, is a species of king crab native to the Bering Sea. It grows to a leg span of , and is heavily targeted by fisheries. The red king crab is the largest species of king crab. Red king crabs can reach a carapace width of up to , a leg span of , and a weight of . Males grow larger than females. Today red king crabs infrequently surpass in carapace width and the average male landed in the Bering Sea weighs .