Fin Whale
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- "Finback" redirects here. For the U.S. submarines of this name, see USS Finback.
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Endangered (EN)<ref name="iucn">Cetacean Specialist Group (1996). Balaenoptera physalus. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 10 May 2006. Database entry includes justification for why this species is endangered </ref> </div> | ||||||||||||||||||
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 Fin Whale range
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The Fin Whale (Balaenoptera physalus), also called the Finback Whale, is a mammal which belongs to the baleen whales suborder. It is the second largest whale and also the second largest animal living, after the Blue Whale.<ref name="marinebio">Balaenoptera physalus Fin Whale. MarineBio.org. Retrieved on 2006-10-23.</ref> The Fin Whale can grow to nearly 27 metres (88 ft) long.<ref name="marinebio"/> It is found in all the world's major oceans, and in waters ranging from the polar to the tropical. It is absent only from waters close to the ice pack at both the north and south poles and relatively small areas of water away from the large oceans. The highest population density occurs in temperate and cool waters.<ref name="nmfs">National Marine Fisheries Service (2006). Draft recovery plan for the fin whale (Balaenoptera physalus) (pdf), Silver Spring, Maryland: National Marine Fisheries Service.</ref> The Fin Whale was heavily hunted during the twentieth century and is listed as an endangered species. The International Whaling Commission (IWC) has issued a moratorium on commercial hunting of this whale. <ref>Revised Management Scheme. International Whaling Commission. Retrieved on 2006-11-07.</ref>
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[edit] Taxonomy
- See also: Evolution of cetaceans
The Fin Whale has long been known to taxonomists. It was first described by Frederick Martens in 1675 and then again by Paul Dudley in 1725. These descriptions were used as the basis of Carolus Linnaeus' Balaena physalus (1758). The Comte de Lacepede reclassified it as Balaenoptera physalus early in the nineteenth century. The specific name comes from the Greek physa, meaning blows.
Fin Whales are rorquals (family Balaenopteridae), a family that includes the Humpback Whale, the Blue Whale, the Bryde's Whale, the Sei Whale and the Minke Whale. The family Balaenopteridae diverged from the other families of the suborder Mysticeti as long ago as the middle Miocene.<ref name="evolution">Gingerich, P. (2004). “Whale Evolution”, McGraw-Hill Yearbook of Science & Technology (PDF), The McGraw Hill Companies.</ref> However, it is not known when the members of these families diverged from each other. Hybridization between the Blue Whale and the Fin Whale is known to occur at least occasionally in the North Atlantic<ref name="berube and aguilar">Bérubé, M., A. Aguilar (1998). "A new hybrid between a blue whale, Balaenoptera musculus, and a fin whale, B. physalus: frequency and implications of hybridization". Mar. Mamm. Sci. 14: 82-98.</ref> and in the North Pacific.<ref name="doroshenko">Doroshenko, V.N. (1970). "A whale with features of the fin and blue whale (in Russian)". Izvestia TINRO 70: 225-257.</ref>
As of 2006, there are two named subspecies, each with distinct physical features and vocalizations. B. p. physalus (Linnaeus 1758), or Northern Fin Whale, is found in the North Atlantic, and B. p. quoyi (Fischer 1829), or Antarctic Fin Whale, is found in the Southern Ocean.<ref name="itis">Balaenoptera physalus (TSN 180527). Integrated Taxonomic Information System. Accessed on 23 October 2006.</ref> Most experts consider the Fin Whales of the North Pacific to be a third unnamed subspecies.<ref name="nmfs"/> On a global scale, the three groups rarely mix, if at all.
[edit] Physical description and behaviour
The Fin Whale is usually distinguished by its great length and slender build. The average size of males and females is 19 and 20 metres (62 and 66 ft), respectively. Subspecies in the northern hemisphere are known to reach lengths of up to 24 metres (79 ft), and the Antarctic subspecies reaches lengths of up to 26.8 metres (88 ft).<ref name="marinebio"/> A full-sized adult has never been weighed, but calculations suggest that a 25 metre (82 ft) animal could weigh as much as 70,000 kilograms (154,000 lb). Full physical maturity is not attained until between 25 and 30 years, although Fin whales have been known to live to 94 years of age.<ref name="martin">Martin, Anthony R. (1991). Whales and dolphins. London: Salamander Books.</ref> A newborn Fin Whale measures about 6.5 metres (21 ft) in length and weighs approximately 1,800 kilograms (4,000 lb).<ref name="ADW">Fox, David (2001). Balaenoptera physalus (fin whale). Animal Diversity Web. Retrieved on 2006-10-22.</ref> The animal's large size aids in identification, and it is usually only confused with the Blue Whale, the Sei Whale, or, in warmer waters, Bryde's Whale.
The Fin Whale has a brownish grey top and sides and a whitish underside. It has a pointed snout, paired blowholes, and a broad, flat rostrum. Two lighter-coloured chevrons begin midline behind the blowholes and slant down the sides toward the tail on a diagonal upward to the dorsal fin, sometimes re-curving forward on the back.<ref name="marinebio"/> It has a large white patch on the right side of the lower jaw, while the left side of the jaw is grey or black.<ref name="ADW"/> This type of asymmetry can be seen occasionally in Minke Whales, but the Fin Whale's asymmetry is universal and thus is unique among cetaceans and is one of the keys to making a full identification. It was hypothesized to have evolved because the whale swims on its right side when surface lunging and it often circles to the right while at the surface above a prey patch. However, the whales just as often circle to the left. There is no accepted hypothesis to explain the asymmetry.<ref>Tershy, B. R., D. Wiley (1992). "Asymmetrical pigmentation in the fin whale: a test of two feeding related hypotheses". Marine Mammal Science 8 (3): 315-318.</ref>
The whale has a series of 56-100 pleats or grooves along the bottom of the body that run from the tip of the chin to the navel that allow the throat area to expand greatly during feeding. It has a curved, prominent (60 cm, 24 in) dorsal fin about three-quarters of the way along the back. Its flippers are small and tapered, and its tail is wide, pointed at the tip, and notched in the centre.<ref name="marinebio"/>
When the whale surfaces, the dorsal fin is visible soon after the spout. The spout is vertical and narrow and can reach heights of 6 metres.<ref name="ADW"/> The whale will blow one to several times on each visit to the surface, staying close to the surface for about one and a half minutes each time. The tail remains submerged during the surfacing sequence. It then dives to depths of up to 250 metres (820 ft), each dive lasting between 10 and 15 minutes. Fin Whales have been known to leap completely out of the water.<ref name="ADW"/>
[edit] Life history
Mating occurs in temperate, low-latitude seas during the winter, and the gestation period is eleven months to one year. A newborn weans from its mother at 6 or 7 months of age when it is 11 or 12 metres (36 to 39 ft) in length, and the calf follows the mother to the winter feeding ground. Females reproduce every 2 to 3 years, with as many as 6 foetuses being reported, but single births are far more common. Females reach sexual maturity at between 3 and 12 years of age.<ref name="ADW"/>
[edit] Feeding
This rorqual is a filter-feeder, using its baleen to strain its food from the water. An adult has between 262 and 473 baleen plates on each side of the mouth. Each plate is made of keratin that frays out into fine hairs on the ends inside the mouth near the tongue. Each plate can measure up to 76 centimetres (30 in) in length and 30 centimetres (12 in) in width.<ref name="marinebio"/> Its food consists of small schooling fish, squid and crustaceans including mysids and krill.<ref name="ADW"/> It has been observed circling schools of fish at high speed, compacting the school into a tight ball, then turning on its side before engulfing the fish. One whale can consume up to 1,800 kilograms (4,000 lb) of food a day.<ref name="marinebio"/>
[edit] Behaviour
The Fin Whale is one of the fastest cetaceans and can sustain speeds of 37 kilometres per hour (23 mi/hr, 20 knots),<ref name="ADW"/> and bursts in excess of 40 kilometres per hour (25 mi/hr, 22 knots) have been recorded, earning the Fin Whale the nickname "the greyhound of the deep".<ref>Fin Whale. nature.ca: Canadian Museum of Nature. Retrieved on 2006-10-22.</ref>
Fin Whales are more gregarious than other rorquals, and often live in groups of 6-10 individuals, although on the feeding grounds aggregations of up to 100 animals may be observed.<ref name="martin" />
[edit] Vocalizations
- See also: Whale song and List of whale songs
| Multimedia relating to the Fin Whale Note that the whale calls have been sped up 10x from their original speed.
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Like other whales, the male Fin Whale has been observed to make long, loud, low-frequency sounds.<ref name="ADW"/> Most sounds are frequency-modulated (FM) down-swept infrasonic pulses from 16 to 40 hertz frequency (the range of sounds that most humans can hear falls between 20 hertz and 20 kilohertz). Each sound lasts between one to two seconds, and various combinations of sounds occur in patterned sequences lasting 7 to 15 minutes each. These sequences are then repeated in bouts lasting up to many days.<ref name="cornell">Finback Whale Vocalizations. Bioacoustics Research Program, Cornell Lab of Ornithology. Retrieved on 2006-10-26.</ref> The vocal sequences are loud; they can reach intensities of 184-186 decibels relative to 1 micropascal (µPa) of sound pressure, and can be detected hundreds of miles from their source. For reference, an observer situated one metre from a whale when it was making its call would perceive a volume roughly equivalent to the volume of a train horn one metre away.<ref>Direct comparisons of sounds in water to sounds in air can be complicated, see The Elusive Decibel for more information.</ref>
Direct association of these vocalizations with the reproductive season for the species and the fact that only males make the sounds point to these vocalizations as possible reproductive displays.<ref name="croll">Croll, D.A., Clark, C.W., Acevedo, A., Flores, S., Gedamke, J., and Urban, J. (2002). "Only male fin wales sing loud songs" (pdf). Nature 417.</ref><ref name="tyack">Watkins, W., Tyack, P., Moore, K., Bird, J.. "The 20-Hz signals of finback whales (Balaenoptera physalus)". The Journal of the Acoustical Society of America 82 (6): 1901-1902.</ref> Over the past 100 years, the dramatic increase in ocean noise from shipping and naval activity may have slowed the recovery of the Fin Whale population, by impeding communications between males and sexually receptive females <ref name="cornell02">Segelken, R. (2002-06-19). Humanity's din in the oceans could be blocking whales' courtship songs and population recovery. Cornell University.</ref>.
[edit] Habitat and migration
Like many of the large rorquals, the Fin Whale is a cosmopolitan species. It is found in all the world's major oceans, and in waters ranging from the polar to the tropical. It is absent only from waters close to the ice pack at both the north and south extremities and relatively small areas of water away from the large oceans, such as the Red Sea, the Persian Gulf, the eastern part of the Mediterranean and the Baltic Sea. The highest population density occurs in temperate and cool waters. It is less densely populated in the hottest, equatorial regions. It prefers deep waters beyond the continental shelf to shallow waters.
The North Atlantic Fin Whale has an extensive distribution, occurring from the Gulf of Mexico and Mediterranean Sea, northward to the edges of the Arctic ice pack. In general, Fin Whales are more common north of approximately 30°N latitude, but considerable confusion arises about their occurrence south of 30°N latitude because of the difficulty in distinguishing Fin Whales from Bryde's Whales.<ref name="mead">Mead, J.G. (1977). "Records of Sei and Bryde's whales from the Atlantic Coast of the United States, the Gulf of Mexico, and the Caribbean". Rep. int. Whal. Commn Spec. Iss. 1: 113-116. ISBN 0-906975-03-4.</ref> Extensive ship surveys have led researchers to conclude that the summer feeding range of Fin Whales in the western North Atlantic was mainly between 41°20'N and 51°00'N, from shore seaward to the 1,000 fathom contour.<ref name="mitchell 1974">Mitchell, E. (1974). “Present status of Northwest Atlantic fin and other whale stocks”, W.E. Schevill (ed.): The Whale Problem: A Status Report. Cambridge, MA: Harvard University Press, 108-169. ISBN 0-674-95075-5.</ref>
Summer distribution of Fin Whales in the North Pacific is the immediate offshore waters from central Baja California to Japan, and as far north as the Chukchi Sea bordering the Arctic Ocean.<ref name="rice">Rice, D.W. (1974). “Whales and whale research in the eastern North Pacific”, W.E. Schevill (ed.): The Whale Problem: A Status Report. Cambridge, MA: Harvard University Press, 170-195. ISBN 0-674-95075-5.</ref> They occur in high densities in the northern Gulf of Alaska and southeastern Bering Sea between May and October, with some movement through the Aleutian passes into and out of the Bering Sea.<ref name="reeves">Reeves, R.R., M.W. Brown (1985). "Whaling in the Bay of Fundy". Whalewatcher 19 (4): 14-18.</ref> Several whales tagged between November and January off southern California were killed in the summer off central California, Oregon, British Columbia, and in the Gulf of Alaska.<ref name="rice"/> Fin Whales have been observed feeding in Hawaiian waters in mid-May, and several winter sightings have been made there.<ref name="mobley">Mobley, J.R., Jr., M. Smultea, T. Norris and D. Weller (1996). "Fin whale sighting north of Kaua'i, Hawai'i". Pacific Science 50 (2): 230-233.</ref> Some researchers have suggested that the whales migrate into Hawaiian waters primarily in the autumn and winter.<ref name="thompson">Thompson, P.O., W.A. Friedl (1982). "A long term study of low frequency sound from several species of whales off Oahu, Hawaii". Cetology 45: 1-19.</ref>
Although fin whales are certainly migratory, moving seasonally in and out of high-latitude feeding areas, the overall migration pattern is not well understood. Acoustic readings from passive-listening hydrophone arrays indicate a southward migration of the North Atlantic Fin Whale occurs in the autumn from the Labrador-Newfoundland region, south past Bermuda, and into the West Indies.<ref name="clark">Clark, C.W. (1995). "Application of US Navy underwater hydrophone arrays for scientific research on whales". Rep. Int. Whal. Commn 45: 210-212.</ref> One or more populations of Fin Whales are thought to remain year-round in high latitudes, moving offshore, but not southward in late autumn.<ref name="clark"/> In the Pacific, migration patterns are difficult to understand. Although some Fin Whales are apparently present in the Gulf of California year-round, there is a significant increase in their numbers in the winter and spring.<ref name="tershy">Tershy, B.R., D. Breese and C.S. Strong (1990). "Abundance, seasonal distribution and population composition of balaenopterid whales in the Canal de Ballenas, Gulf of California, Mexico". Rep. Int. Whal. Commn Spec. Iss. 12: 369-375. ISBN 0-906975-23-9.</ref> Antarctic Fin Whales migrate seasonally from relatively high-latitude Antarctic feeding grounds in the summer to low-latitude breeding and calving areas in the winter. The location of winter breeding areas is still unknown, since these whales tend to migrate in the open ocean and thus exact locations have been difficult to determine.<ref name="nmfs"/>
[edit] Abundance and trends
The lack of understanding of the migration pattern of the Fin Whale combined with population surveys that are often contradictory makes estimating the historical and current population levels of the whale difficult and contentious. Due to a long history of hunting this whale, pre-exploitation population levels are difficult or impossible to accurately determine, yet estimates are important to measure the rate of recovery of the species.
[edit] North Atlantic
In the North Atlantic, Fin Whales are defined by the International Whaling Commission to exist in one of seven discreet population zones; Nova Scotia, Newfoundland-Labrador, West Greenland, East Greenland-Iceland, North Norway, West Norway-Faroe Islands, and British Isles-Spain-Portugal. Results of mark-and-recapture surveys have indicated that some movement occurs across the boundaries of these population zones, suggesting that each zone is not entirely discrete and that some immigration and emigration does occur.<ref name="mitchell 1974"/> J. Sigurjónsson estimated in 1995 that a total pre-exploitation population size of the Fin Whale in the entire North Atlantic ranged between 50,000 and 100,000 animals,<ref name="sigurjonsson">Sigurjónsson, J. (1995). “On the life history and autecology of North Atlantic rorquals”, A.S. Blix, L. Walløe, and Ø. Ulltang (ed.): Whales, Seals, Fish and Man. Elsevier Science, 425-441. ISBN 0-444-82070-1.</ref> but his research is criticized for not providing supporting data and an explanation of his reasoning.<ref name="nmfs"/> In 1977, D.E. Sergeant suggested a "primeval" aggregate total of 30,000 to 50,000 Fin Whales throughout the North Atlantic.<ref name="sergeant">D.E. Sergeant (1977). "Stocks of fin whales Balaenoptera physalus L. in the North Atlantic Ocean". Rep. Int. Whal. Commn 27: 460-473.</ref> Of that number, about 8,000 to 9,000 would have resided in the Newfoundland and Nova Scotia areas, with whales summering in U.S. waters south of Nova Scotia presumably not having been taken fully into account.<ref name="allen">Allen, K.R. (1970). "A note on baleen whale stocks of the north west Atlantic". Rep. Int. Whal. Commn 20: 112-113.</ref><ref name = "nmfs"/> J.M. Breiwick estimated that the "exploitable" (above the legal size limit of 50 feet) component of the Nova Scotia population was 1,500 to 1,600 animals in 1964, reduced to only about 325 in 1973.<ref name="breiwick">Breiwick, J.M.. "Population dymanics and analyses of the fisheries for fin whales (Balaenoptera physalus) in the northwest Atlantic Ocean". (Ph.D. thesis) University of Washington, Seattle. 310 pp.. </ref> Two aerial surveys have been conducted in Canadian waters since the early 1970s, giving numbers of 79 to 926 whales on the eastern Newfoundland-Labrador shelf in August 1980,<ref name="hay">Hay, K. (1982). "Aerial line-transect estimates of abundance of humpback, fin, and long-finned pilot whales in the Newfoundland-Labrador area". Rep. Int. Whal. Commn 31: 373-387.</ref> and a few hundred in the northern and central Gulf of St. Lawrence in August 1995-1996.<ref name="kingsley">Kingsley, M.C.S., R.R. Reeves (1998). "Aerial surveys of cetaceans in the Gulf of St. Lawrence in 1995 and 1996". Marine Mammal Science 17 (1): 35-75.</ref> Estimates of the number of Fin Whales in the waters off West Greenland in the summer range between 500 and 2,000,<ref name="larson">Larson, F. (1995). "Abundance of minke and fin whales off West Greenland". Rep. Int. Whal. Commn 45: 365-370.</ref> and in 1974, Jonsgard considered the Fin Whales off Western Norway and the Faroe Islands to "have been considerably depleted in postwar years, probably by overexploitation".<ref name="jonsgard74">Jonsgard, A. (1974). “On whale exploitation in the eastern part of the North Atlantic Ocean”, W.E. Schevill (ed.): The Whale Problem: A Status Report. Cambridge, MA: Harvard University Press, 97-107. ISBN 0-674-95075-5.</ref> The population around Iceland appears to have fared much better, and in 1981, the population appeared to have undergone only a minor decline since the early 1960s.<ref name="rorvik81">Rørvik, C.J., J. Sigurjónsson (1981). "A note on the catch per unit effort in the Icelandic fin whale fishery". Rep. Int. Whal. Commn 31: 379-383.</ref> Surveys during the summers of 1987 and 1989 produced estimates in the order of 10,000 to 11,000 Fin Whales between East Greenland and Norway.<ref name="buckland">Buckland, S.T., K.L. Cattanach and Th. Gunnlaugsson (1992). "Fin whale abundance in the North Atlantic, estimated from Icelandic and Faroese NASS-87 and NASS-89 data". Rep. Int. Whal. Commn 42: 645-651.</ref> This shows a substantial recovery when compared to a survey in 1976 showing an estimate of 6,900 whales, which was considered to be a "slight" decline since 1948 levels.<ref name="rorvik76">Rørvik, C.J., J. Jónsson, O.A. Mathisen, and Å. Jonsgård (1976). "Fin Whales, Balaenoptera physalus (L.), Off the West Coast of Iceland. Distribution, Segregation by Length and Exploitation". Rit Fiskideildar 5: 1-30. ISSN 0484-9019.</ref> Estimates of population levels in the British Isles-Spain-Portugal area in summer have have ranged from 7,500<ref name="goujon">Goujon, M., J. Forcada and G. Desportes (1995). "Fin whale abundance in the eastern temperate North Atlantic for 1993.". Rep. Int. Whal. Commn 45: 287-290.</ref> to more than 17,000.<ref>Buckland, S.T., K.L. Cattanach and S. Lens (1992). "Fin whale abundance in the eastern North Atlantic, estimated from Spanish NASS-89 data". Rep. Int. Whal. Commn 42: 457-460.</ref> In total, the aggregate population level of the North Atlantic Fin Whale is estimated to be between 40,000<ref name="berube98">Bérubé, M., Aguilar, A., Dendanto, D., Larsen, F., Notarbartolo di Sciara, G., Sears, R., Sigurjónsson, J., Urbán-R, J. and Palsbøll, P.J. (1998). "Population genetic structure of North Atlantic, Mediterranean Sea and Sea of Cortez Fin Whales, Balaenoptera physalus (Linnaeus 1758): analysis of mitochondrial and nuclear foci". Molecular Ecology 7: 585-599. ISSN 1471-8278.</ref> and 56,000<ref name="berube and aguilar"/> individuals.
[edit] North Pacific
The total historical North Pacific Fin Whale population has been estimated at 42,000 to 45,000 before the start of whaling. Of this, the population in the eastern portion of the North Pacific was estimated to be 25,000 to 27,000.<ref name="ohsumi">Ohsumi, S., S. Wada (1974). "Status of whale stocks in the North Pacific, 1972". Rep. Int. Whal. Commn 24: 114-126.</ref> By 1975, the population estimate had declined to between 8,000 and 16,000.<ref name="rice74">Rice, D.W. (1974). “Whales and whale research in the eastern North Pacific”, W.E. Schevill (ed.): The Whale Problem: A Status Report. Cambridge, MA: Harvard University Press, 170-195. ISBN 0-674-95075-5.</ref><ref name = "chapman">Chapman, D.G. (1976). "Estimates of stocks (original, current, MSY level and MSY)(in thousands) as revised at Scientific Committee meeting 1975". Rep. Int. Whal. Commn 26: 44-47.</ref> Surveys conducted in 1991, 1993, 1996, and 2001 produced estimates of between 1,600 and 3,200 Fin Whales off California and 280 to 380 Fin Whales off Oregon and Washington.<ref name="barlow03">Barlow, J.. "Preliminary estimates of the Abundance of Cetaceans along the U.S. West Coast: 1991-2001". Administrative report LJ-03-03, available from Southwest Fisheries Science Center, 8604 La Jolla Shores Dr., La Jolla CA 92037. </ref> The miniumum estimate for the California-Oregon-Washington population, as defined in the U.S. Pacific Marine Mammal Stock Assessments: 2005, is about 2,500.<ref name="caretta">Caretta, J.V., K.A. Forney, M.M. Muto, J. Barlow, J. Baker, B. Hanson, and M.S. Lowry. "U.S. Pacific Marine Mammal Stock Assessments: 2005" (PDF). U.S. Department of Commerce Technical Memorandum, NOAA-TM-NMFS-SWFSC-388. </ref> Surveys near the Pribilof Islands in the Bering Sea indicated a substantial increase in the local abundance of Fin Whales between 1975-1978 and 1987-1989.<ref name="baretta">Baretta, L., G.L. Hunt, Jr. (1994). "Changes in the numbers of cetaceans near the Pribilof Islands, Bering Sea, between 1975-78 and 1987-89" (PDF). Arctic 47: 321-326.</ref> In 1984, the entire North Pacific Fin Whale population was estimated to be at less than 38% of its historic carrying capacity.<ref name="mizroch">Mizroch, S.A., D.W. Rice, and J.M. Breiwick (1984). "The fin whale, Balaenoptera physalus". Mar. Fish. Review 46: 20-24.</ref>
[edit] Antarctica
Relatively little is known about the historical and current population levels of the Antarctic Fin Whale. The IWC officially estimates that the pre-whaling population of the Fin Whale in the southern hemisphere was 400,000 whales, and that the population in 1979 was 85,200.<ref name="IWC79">IWC (1979). "Report of the sub-committee on protected species. Annex G, Appendix I". Rep. Int. Whal. Commn 29: 84-86.</ref> Both the current and historical estimates should be considered as poor estimates because the methodology and data used in the study is known to be seriously flawed.<ref name="nmfs"/> Other estimates cite current population levels of no more than 5,000 whales and possibly as low as 2,000 to 3,000.<ref name="ADW"/> As of 2006, there is no scientifically accepted estimate of current population or trends in abundance.<ref name="nmfs"/>
[edit] Human interaction
- See also: Whaling and History of whaling
In the 19th century, the Fin Whale was ocassionally hunted by the sailing-vessel whalers, but it was relatively safe due to its quick speed and the fact that it prefers the open sea. However, the introduction of steam-powered boats in the second half of that century and harpoons that exploded on impact made it possible to kill and secure Blue Whales, Fin Whales, and Sei Whales on an industrial scale. As other whale species became over-hunted, the whaling industry turned to the still-abundant Fin Whale as a replacement.<ref name="acs">American Cetacean Society Fact Sheet: Fin Whale, Balaenoptera physalus. American Cetacean Society. Retrieved on 2006-10-23.</ref> It was primarily hunted for its blubber, oil, and baleen. Approximately 704,000 Fin Whales were caught in Antarctic whaling operations alone between 1904 and 1975.<ref name="IWC90">IWC (1995). "Report of the scientific committee". Rep. Int. Whal. Commn 45: 53-221.</ref> After the introduction of factory whaling ships in 1925, the number of whales taken per year increased substantially. In 1937 alone, over 28,000 Fin Whales were taken. From 1953 to 1961, whaling of the species averaged around 25,000 per year. By 1962, Sei Whale catches began to increase as Fin Whales became scarce. By 1974, less than 1,000 Fin Whales were being caught each year. The IWC prohibited the taking of Fin Whales from the southern hemisphere in 1976.<ref name="IWC90"/> In the North Pacific, a reported total of approximately 46,000 Fin Whales were killed by commercial whalers between 1947 and 1987.<ref name="barlow97">Barlow, J., K. A. Forney, P.S. Hill, R.L. Brownell, Jr., J.V. Caretta, D.P. DeMaster, F. Julian, M.S. Lowry, T. Ragen, and R.R. Reeves. "U.S. Pacific Marine Mammal Stock Assessments: 1996" (PDF). NOAA Technical Memo NMFD-SWFSC-248. </ref> Acknowledgement that the Soviet Union engaged in the illegal killing of protected whale species in the North Pacific implies that the reported catch data is incomplete.<ref name="yablokov">Yablokov, A.V. (1994). "Validity of whaling data". Nature 367: 108.</ref> The Fin Whale was given full protection from commercial whaling by the IWC in the North Pacific in 1976, and in the North Atlantic in 1987, with the exception of small aboriginal catches and catches for research purposes.<ref name="ADW"/> All populations worldwide remain listed as endangered species by the US Fish & Wildlife Service and the International Conservation Union Red List, and the Fin Whale is on Appendix 1 of CITES.<ref name="iucn"/><ref name="ADW"/><ref name="cites">UNEP-WCMC Species Database: CITES-Listed Species. UNEP-WCMC (2006-10-23). Retrieved on 2006-10-23.</ref><ref name="usfws">Species Profile for Finback whale. U.S. Fish & Wildlife Service. Retrieved on 2006-10-23.</ref>
The Fin Whale is hunted in the Northern Hemisphere in Greenland, under the International Whaling Commission's procedure for aboriginal subsistence whaling. Meat and other products from whales killed in this hunt are widely marketed within the Greenland economy, but export is illegal. The IWC has set a quota of 19 Fin Whales per year for Greenland despite concern about uncertainty about current population levels. Iceland and Norway are not bound by the IWC's moratorium on commercial whaling because both countries filed objections to that moratorium.<ref name="nmfs"/> In October 2006, Iceland's fisheries ministry authorized the hunting of nine Fin Whales through August 2007.<ref>Iceland to Resume Whale Hunting, Defying Global Ban. Bloomberg.com (2006-10-18). Retrieved on 2006-10-23.</ref> In the southern hemisphere, Japan has targeted Fin Whales in its Antarctic Special Permit whaling program for the 2005-2006 and 2006-2007 seasons at 10 whales killed per year.<ref name"usinfo">U.S. Protests Japan’s Announced Return to Whaling in Antarctic. Bureau of International Information Programs, U.S. Department of State (20 November, 2006). Retrieved on 2006-11-27.</ref> The proposal for 2007-2008 and the subsequent 12 seasons includes 50 Fin Whales per year.<ref name="nmfs"/>
Collisions with ships are an additional major cause of Fin Whale mortality. In some areas, they represent a substantial portion of the strandings of large whales. Most lethal and serious injuries are caused by large, fast-moving ships over or near the continental shelf.<ref>Laist, D.W., Knowlton, A.R., Mead, J.G., Collet A.S., and Podesta, M. (2001). "Collisions between ships and whales" (PDF). Marine Mammal Science 17: 35-75.</ref>
[edit] See also
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[edit] References
<references />
[edit] General references
- National Audubon Society Guide to Marine Mammals of the World, Reeves, Stewart, Clapham and Powell, ISBN 0-375-41141-0
- Whales & Dolphins Guide to the Biology and Behaviour of Cetaceans, Maurizio Wurtz and Nadia Repetto. ISBN 1-84037-043-2
- Encyclopedia of Marine Mammals, editors Perrin, Wursig and Thewissen, ISBN 0-12-551340-2
[edit] External links
- ARKive - images and movies of the fin whale (Balaenoptera physalus)
- Juvenile fin whale beaches off Ireland
- Fin Whale Vocalizations
da:Finhval de:Finnwal es:Balaenoptera physalus eo:Balenoptero fr:Rorqual commun hr:Kit perajar it:Balaenoptera physalus he:רורקל ענק nl:Gewone vinvis ja:ナガスクジラ pl:Finwal pt:Baleia-comum sk:Vráskavec myšok fi:Sillivalas sv:Sillval
