| 词条 | Northern fin whale |
| 释义 |
| name = Northern fin whale[1] | image = Finwhaleapproach.jpg | image_caption = | image2 = Fin_whale_size.svg | image2_caption = Size compared to an average human | genus = Balaenoptera | species = physalus | species_link = Fin whale | subspecies = physalus | authority = (Linnaeus, 1758) }} The northern fin whale (Balaenoptera physalus physalus) is a subspecies of fin whale that lives in the North Atlantic Ocean and North Pacific Ocean.[1] It is possible that the population in each ocean represents a separate subspecies. At least one other subspecies of fin whale, the southern fin whale (B. p. quoyi), exists in the southern hemisphere.[1] SizeNorthern fin whales are smaller than their southern hemisphere counterparts, with adult males averaging {{convert|18.5|m|abbr=on}} and adult females {{convert|20|m|abbr=on}}.[2] Maximum reported figures are {{convert|22.9|m|abbr=on}} for males and {{convert|24.7|m|abbr=on}} for females in the North Pacific, while the longest reliably measured were {{convert|20.8|m|abbr=on}} and {{convert|22.9|m|abbr=on}} — all were caught off California, the former in the 1920s and the latter in the 1960s.[3] At sexual maturity, males average {{convert|16.8|-|17.6|m|abbr=on}} in the North Atlantic and {{convert|17.4|-|17.7|m|abbr=on}} in the North Pacific, while females average {{convert|17.7|-|19.1|m|abbr=on}} in the North Atlantic and {{convert|18.3|-|18.6|m|abbr=on}} in the North Pacific. At birth, calves are {{convert|6.4|m|abbr=on}} in the North Pacific.[2] ReproductionBecause of the opposing seasons in each hemisphere, B. p. physalus breeds at a different time of the year than B. p. quoyi. Peak conception for B. p. physalus is December–January, while peak birthing is in November–December — in both the North Atlantic and North Pacific.[2] References1. ^1 2 {{ITIS | id = 180527 | taxon = Balaenoptera physalus | accessdate = 2012-08-15 }} {{Taxonbar|from=Q7059206}}2. ^1 2 Evans, Peter G. H. (1987). The Natural History of Whales and Dolphins. Facts on File. 3. ^{{cite journal | last1 = Clapham | year = 1997 | title = Catches of Humpback and Other Whales from Shore Stations at Moss Landing and Trinidad, California, 1919-1926 | url = | journal = Mar. Mam. Sci. | volume = 13 | issue = 3| pages = 368–94 | doi=10.1111/j.1748-7692.1997.tb00646.x|display-authors=etal}} 2 : Baleen whales|Mammals described in 1758 |
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