Megamouth shark
Also known as Megachasma pelagios
Rare deepwater shark discovered in 1976
Species
big mouth shark
Species
- PhylumChordata
- ClassElasmobranchii
- OrderLamniformes
- FamilyMegachasmidae
Habitatmarine
巨口鲨（学名：Megachasma pelagios），又名巨口鮫、大口鯊，是巨口鲨科巨口鯊屬下的唯一一種，目前全世界发现（捕獲或目擊）數量僅50隻左右[2]（自1976年第一次目擊至2012年間僅55例），相當罕見。第一隻巨口鯊是在1976年於夏威夷外海發現的[3]。巨口鯊分布在世界各地，棲息深度約5至1000米之間，以深海居多，故很少被發現。 目录 1 特徵 2 生殖 3 生活習性 4 參考資料 5 外部链接 特徵 头部，该标本藏于西澳大利亚海洋博物馆 巨口鲨头大嘴大，细牙成须状，和姥鲨科及鲸鲨科的鲨鱼一样，以过滤浮游生物为食物；口附近有發光器，可能用來吸引獵物。尾长，但和长尾鲨科不同，上半叶上翘得較不明顯。體色呈棕黑色，腹部偏白色。有別於鼠鯊目的其他種類，巨口鲨的吻部較圓潤且不明顯。體長4至5.5公尺，體重最重可達1噸（1215公斤）。 生殖 巨口鲨和姥鯊及鯨鯊一樣，巨口鲨也是卵胎生的鯊魚，幼鯊在卵時期的時候都待在母體內，直到卵孵化為止，幼鯊才會離開母體。 生活習性 世界各地目擊巨口鯊地點 1990年10月21日，美國加州的達納捕獲了一隻雄性巨口鯊。 2017年5月16日，臺灣花蓮縣外海的定置漁場捕獲一尾長4.8公尺、重700公斤的巨口鯊，經漁民通報，海巡署測量紀錄後，賣至海產店。引發環團不滿。 參考資料 ^ Megachasma pelagios (Megamouth Shark). IUCN Red List of Threatened Species 2014.3. International Union for Conservation of Nature. 2005 [16 December 2014]. ^ 中央廣播電台. 台東漁船捕獲巨口鯊全球第42尾. [2009-06-10].[永久失效連結] ^ Florida Museum of Natural History. Male Megamouth Shark caught in Dana Point, California. [2009-06-10].
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The megamouth shark (Megachasma pelagios) is a species of deepwater shark. Rarely seen by humans, it measures around 13–18 ft (4–5.5 m) long and is the smallest of the three extant filter-feeding sharks alongside the much larger whale shark and basking shark. According to Sharkman's World Organization, a total of 296 specimens have been observed or caught since its discovery in 1976. Like the other two planktivorous sharks, it swims with its mouth wide open, filtering water for plankton and jellyfish. The diet of megamouth sharks mainly consists of zooplanktonic organisms like krill, jellyfish, shrimp larvae, squat lobsters, and crab larvae. It is recognizable from its large head with rubbery lips. The megamouth is so unlike any other type of shark that it is usually considered to be the sole extant species in the family Megachasmidae, though some scientists have suggested it may belong in the family Cetorhinidae.
Taxonomy and evolution