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There are at least three distinct subspecies: B. m. musculus of the North Atlantic and North Pacific, B. m. intermedia of the Southern Ocean and B. m. brevicauda (also known as the pygmy blue whale) found in the Indian Ocean and South Pacific Ocean.B. m. indica, found in the Indian Ocean, may be another subspecies.lue whales were abundant in nearly all the oceans on Earth until the beginning of the twentieth century. For over a century, they were hunted almost to extinction by whalers until protected by the international community in 1966.
The largest populations occur in the Southern Hemisphere, the North Pacific, and the North Atlantic. In the North Pacific, blue whales can be seen from California up to the Gulf of Alaska and the Aleutian Islands. Wintering grounds are off the coast of southern California, Baja California, Taiwan, Japan and Korea.ength and Weight: The average length of a blue whale is 75 - 80 feet (23 - 24 meters) and these long marine mammals can weigh up to 200,000 pounds (90,000 kg). Whales in the southern hemisphere are generally larger than those in the northern hemisphere.