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The Minke Whale or Lesser Rorqual is a marine mammal belonging to the suborder of baleen whales. The Minke Whale was first identified by Lacepede in 1804.
Taxonomy Most modern classifications split the Minke Whale into two species; the Common or Northern Minke Whale (Balaenoptera acutorostrata) and the Antarctic or Southern Minke Whale (Balaenoptera bonaerensis) . Taxonomists further categorize the Common Minke Whale into two or three subspecies; the North Atlantic Minke Whale, the North Pacific Minke Whale and Dwarf Minke Whale. All Minke Whales are part of the rorquals, a family that includes the Humpback Whale, the Fin Whale, the Bryde's Whale, the Sei Whale and the Blue Whale. The junior synonyms for B. acutorostrata are B. davidsoni Cope 1872, B. minimia (Rapp, 1837) and B. rostrata (Fabricius, 1780). There is one synonym for B. bonaerensis - B. huttoni Gray 1874. Writing in his 1998 classification, Rice recognised two subspecies of the Common Minke Whale - B. a. scommni (Scommon's Minke Whale) and a further (taxonomically) unnamed subspecies found in the southern hemisphere to which he gave the common name the Dwarf Minke Whale Physical characteristics The Minke Whale is the second smallest of the baleen whales - only the Pygmy Right Whale is smaller. Male and female Minke Whales measure an average of 6.9 and 7.4 metres (22'8" to 24' 3") in length, respectively, at sexual maturity (6-8 years of age). Estimates of maximum length vary from 9.1m to 10.7m (28'10" to 35'1") for females and 8.8m to 9.8m (28'8" 10" to 32'5") for males. Both sexes typically weigh 4-5 tonnes at maturity, and the maximum weight may be as much as 14 tonnes. The gestation period for Minke Whales is 10 months and babies measure 2.4 to 2.8 metres (7'10" to 9'2") at birth. The newborns nurse for five months. Minke Whales are distinguished from other whales by a white band on each flipper. The body is usually black or dark-grey above and white underneath. Most of the length of the back, including dorsal fin and blowholes, appears at once when the whale surfaces to breathe. The whale then breathes 3-5 times at short intervals before 'deep-diving' for 2-20 minutes. Deep dives are preceded by a pronounced arching of the back. The maximum swimming speed of Minkes has been estimated at 20-30km/h. Minke Whales have between 240 and 360 baleen plates on each side of their mouths. Minke Whales typically live for 30-50 years; in some cases they may live for up to 60 years. Population and distribution The total population of Minke Whales is estimated to be in the order of 184,000 (95% confidence interval, IWC Scientific Committee 2004) in the Central and North East Atlantic. As of 2005, there are no agreed estimates for North Pacific or Southern Hemisphere. In the early 1990s the IWC Scientific Committee, after analysing the available data, agreed that Minkes in the Southern Hemisphere numbered 760,000, which the Japanese whaling industry uses as the current (2005) estimate. In 2000, however, the Committee withdrew this advice in light of new survey data suggesting population estimates 50% lower than in the 1980s (Branch & Butterworth 2001). The IWC IDCR/SOWER population surveys (1978/79-2003/04) will give a revised estimate to the IWC scientific committee at the annual IWC meeting in 2006. Minke Whales are widely distributed throughout the world, commonly found from the poles to the tropics but prefer the open sea. The IUCN list the northern species as Lower Risk/Near Threatened and the southern as Lower Risk/Conservation dependent. CITES list both of the species in Appendix I (endangered) with the exception of the West Greenland stock, which is given in Appendix II (trade controls required). Whaling
Minke Whale-watching On account of their relative abundance Minke Whales are often the focus of whale-watching cruises setting sail from, for instance, the Isle of Mull in Scotland and Húsavík in Iceland. Minke Whales are frequently inquisitive and will indulge in 'human-watching'. In contrast to the spectacularly acrobatic Humpback Whale, Minkes do not raise their fluke out of the water when diving and are less likely to breach (jump clear of the sea surface). This, combined with the fact that Minkes can dive under water for as long as twenty minutes, has led some whale-watching enthusiasts to label them 'stinky Minkes'. The name may also be applied because it is frequently possible to smell the breath of a Minke Whale whilst observing it from a boat. | |||||||||||
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