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Fin Whale
Introducing the second-largest living animal
Common Name: Fin whale, common rorqual, fin-basked whale, finner, herring whale, razorback; Baleine à nageoires, baleinoptère commune, rorqual commun (Fr); Ballena aleta, ballena boba, rorcual comùn (Sp)
Scientific Name: Balaenoptera physalus
Population: Between 50,000-90,000 individuals
Background
The fin whale, the second largest living mammal, has been severely impacted worldwide by commercial whaling. Nearly 750,000 animals were killed in areas of the Southern Hemisphere alone between 1904 and 1979, and they are rarely seen there today. Their current status is unknown in most areas outside of the North Atlantic.
Physical Description
The fin whale is the second-largest living animal, after the blue whale. This animal is very streamlined in appearance with a distinct ridge along the back behind the dorsal fin, which gives it the nickname "razorback". The dorsal fin, which is about 24 inches high, is set two thirds of the way along the back. The jaw is large and when the mouth is closed the lower jaw protrudes slightly beyond the tip of the snout.
Fin whales are slimmer and not as heavy as blue whales. On average, 85 ventral grooves run along the underside of their body and there are 350-400 baleen plates in their mouths.
Fin whales are found in all the oceans of the world, but their migration patterns are not well understood. In the Southern Hemisphere, fin whales migrate south to feed on krill and other plankton in the summer, and north to likely give birth in warm waters closer to the Equator in the winter. However, it is not clear whether all of the population engages in this migration every year.
In the Northern Hemisphere there are similar north-south migrations, and many whales appear to return to the same feeding grounds every year, but the pattern is not so clear, perhaps because of the influence of the Gulf Stream in the North Atlantic. Populations of northern and southern hemispheres never meet.
Size
Adult fin whales are about 62 feet long for males and 65 feet for females, with a maximum of 82 feet in males and 88 feet in females. It is estimated that a 82 foot long whale would weigh about 77 tons.
Color
Fin whales are dark grey to brownish black, with pale or white undersides. The undersides of the flippers and flukes are also white. Some fin whales have a pale grey chevron on each side behind the head and there may be a dark stripe running up and back from the eye, and a light stripe arching down to where the flipper joins the body.
This species has a rare characteristic among mammals, known as asymmetrical pigmentation: the lower right jaw is bright white, the lower left jaw black. The reason for this unusual coloring is unknown, but some scientists have speculated that fin whales circle schools of fish with the white side facing the prey and frightening them into denser schools that are easier for the whale to catch.
Habitat
Range States
Angola, Argentina, Australia, Bangladesh, Brazil, Canada, Ecuador, Faroe Islands, French Polynesia, French Southern Territories, Greenland, Hong Kong, Iceland, India, Indonesia, Italy, Japan, Kenya, Democratic People's Republic of Korea, Republic of Korea, Madagascar, Mexico, Myanmar, Namibia, New Zealand, Norway, Pakistan, Poland, Portugal, Russian Federation, South Africa, South Georgia and the South Sandwich Islands, Spain, Sri Lanka, Suriname, Svalbard and Jan Mayen, Taiwan, United Republic of Tanzania, Tunisia, United Arab Emirates, United Kingdom
Ecological Region
Antarctic Peninsula and Weddell Sea, Bering-Beaufort-Chukchi Seas, Barents-Kara Seas, Mediterranean Sea, Northeast Atlantic Shelf Marine, Grand Banks, Chesapeake Bay, Yellow Sea, Okhotsk Sea, Patagonian Southwest Atlantic, Southern Australian Marine, New Zealand Marine, California Current, Benguela Current, Humboldt Current, Agulhas Current, Western Australia Marine, Panama Bight, Gulf of California, Galapagos Marine, Canary Current, Nansei Shoto, Sulu-Sulawesi Seas, Bismarck-Solomon Seas, Banda-Flores Sea, New Caledonia Barrier Reef, Great Barrier Reef, Lord Howe-Norfolk Islands Marine, Palau Marine, Andaman Sea, Tahitian Marine, Hawaiian Marine, Rapa Nui, Fiji Barrier Reef, Maldives, Chagos, Lakshadweep Atolls, Red Sea, Arabian Sea, East African Marine, West Madagascar Marine, Mesoamerican Caribbean Reef, Greater Antillean Marine, Southern Caribbean Sea, Northeast Brazil Shelf Marine.
Interesting Facts
The fin whale can sustain a speed of around 23 m/hr, and can leap completely out of the water.
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