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The blue whale Balaenoptera musculus is a marine mammal belonging to the baleen whale suborder Mysticeti. Reaching a maximum confirmed length of There are currently five subspecies of blue whale, recognized by the Society for Marine Mammalogy 's Committee on Taxonomy: B.
The blue whale diet consists almost exclusively of euphausiids krill. Blue whales were abundant in nearly all the oceans on Earth until the end of the 19th century. They were hunted almost to extinction by whaling until the International Whaling Commission banned all hunting of blue whales in The International Whaling Commission catch database estimates that , blue whales were caught between and Blue whales have long, slender mottled grayish-blue bodies, although they appear blue underwater.
The mottling pattern is highly variable and the unique pigmentation pattern along the back in the region of the dorsal fin can be used to identify known individuals. Their pale underside can accumulate a yellowish diatom coat,    which historically earned them the nickname sulphur bottom. The blue whale is the largest known animal. The average length of sexually mature female blue whales is Eastern North Pacific blue whale males average Pygmy blue whale males average The most reliable age estimations are from ear plugs.
Blue whales secrete earwax cerumen throughout their lives forming long, multilayered plugs. Each chronologically deposited light and dark layer lamina indicate a switch between fasting during migration and feeding, and one set is laid down per year, and thus the number of these layers can be used as an indicator of age. In addition, the ovaries of female blue whales form a permanent record of the number of ovulations or perhaps pregnancies , in the form of corpora albicantia.
These fibrous masses are permanent scars that have been used in the past as an indication of age. The distributions of the five subspecies of blue whale are outlined below. The northern subspecies, B. The Antarctic subspecies, B. The pygmy subspecies, B. The Northern Indian Ocean subspecies, B. Northern Indian Ocean blue whales may be separated into one or more populations as songs are collected from more areas in this region. The Chilean subspecies, B. In the North Atlantic , blue whales can be seen in the Gulf of St.