|
Daggertooth
The daggertooths (genus ''Anotopterus'') are a genus of marine mesopelagic fish in the order Aulopiformes, the sole genus of the family Anotopteridae. They are found in oceans worldwide, but prefer cooler waters. Description Daggertooths are similar in appearance to the related lancetfishes and barracudina. They are elongate, silvery, predatory marine fishes that lack scales and have sharp teeth likely used for hunting fishes. However, as their scientific name (meaning "without fins on its back") suggests, they lack dorsal fins which easily differentiates them from their close allies, especially the similar-looking lancetfishes. Another feature that distinguishes daggertooths from lancetfishes is the placement of the large, fang-like teeth. In lancetfishes, the fangs appear on both the upper and lower jaws while in daggertooths the fangs are only seen along the upper jaw. Whether the fangs or the distinctly protruding mandible inspired the common name "daggertooth" remains unclea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anotopterus Pharao PC14-04 Sta11 IMG 6599
The daggertooths (genus ''Anotopterus'') are a genus of marine mesopelagic fish in the order Aulopiformes, the sole genus of the family Anotopteridae. They are found in oceans worldwide, but prefer cooler waters. Description Daggertooths are similar in appearance to the related lancetfishes and barracudina. They are elongate, silvery, predatory marine fishes that lack scales and have sharp teeth likely used for hunting fishes. However, as their scientific name (meaning "without fins on its back") suggests, they lack dorsal fins which easily differentiates them from their close allies, especially the similar-looking lancetfishes. Another feature that distinguishes daggertooths from lancetfishes is the placement of the large, fang-like teeth. In lancetfishes, the fangs appear on both the upper and lower jaws while in daggertooths the fangs are only seen along the upper jaw. Whether the fangs or the distinctly protruding mandible inspired the common name "daggertooth" remains unc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anotopterus Pharao
The daggertooth (''Anotopterus pharao'', meaning "without fins on its back, of the Pharaoh") is a species of daggertooth. Its distribution includes the North Atlantic Ocean and west of Africa. The record size for this species is 96 cm and was hermaphroditic. Daggertooths are occasionally found dead in bottom trawls used for firefly squid or shrimp. They are similar to needlefish or gars. However, they are distinct. Netted daggertooth specimens are rarely identifiable, mostly because of their soft bodies, which are easily torn or flattened. This is typical of benthic animals of the deep ocean, like some transparent squids. In fact, the bodies are so soft, when pushed against the back of a trawl net, they often die because their organs are crushed and they rip. The habitat of the daggertooth is the open abyss, where few obstacles occur with which to come into physical contact. Metamorphosis The species undergoes metamorphosis, whereupon they become black in colour ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anotopterus Vorax
''Anotopterus vorax'', the Southern Ocean daggertooth, is a species of daggertooth. It inhabits the Southern Ocean circumglobally. Description It commonly grows to 90 cm length, and can grow to 105 cm. It has an iridescent skin, and sapphire blue eyes. The colours fade quickly when the fish is removed from the water. It has unusual forward-curved teeth in the upper jaw. It bites fish prey then pulls backwards, often cutting the spine and paralysing the prey. It eats mostly small fish, particularly '' Notolepis coatsi'', a barracudina. Biology Prior to spawning, the species sheds its teeth, while its gastrointestinal tract The gastrointestinal tract (GI tract, digestive tract, alimentary canal) is the tract or passageway of the Digestion, digestive system that leads from the mouth to the anus. The tract is the largest of the body's systems, after the cardiovascula ... atrophies. They are monocyclic, dying after spawning. This reproductive strategy may have b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mesopelagic Fish
Pelagic fish live in the pelagic zone of ocean or lake waters—being neither close to the bottom nor near the shore—in contrast with demersal fish that live on or near the bottom, and reef fish that are associated with coral reefs. The marine pelagic environment is the largest aquatic habitat on Earth, occupying 1,370 million cubic kilometres (330 million cubic miles), and is the habitat for 11% of known fish species. The oceans have a mean depth of . About 98% of the total water volume is below , and 75% is below . Moyle and Cech, p. 585 Marine pelagic fish can be divided into coastal (inshore) fish and oceanic (offshore) fish. Coastal pelagic fish inhabit the relatively shallow and sunlit waters above the continental shelf, while oceanic pelagic fish inhabit the vast and deep waters beyond the continental shelf (even though they also may swim inshore). Pelagic fish range in size from small coastal forage fish, such as herrings and sardines, to large apex predat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aulopiformes
Aulopiformes is a diverse order (biology), order of Marine (ocean), marine ray-finned fish consisting of some 15 Extant taxon, extant and several prehistoric family (biology), families with about 45 genera and over 230 species. The common names grinners, lizardfishes and allies, or aulopiforms are sometimes used for this group. They are included in the superorder Cyclosquamata, though modern taxonomists consider this superorder to be unwarranted. Many Neontology, extant aulopiforms are deep-sea fishes, with some species recognized as being hermaphroditic, a number of which are able to Autogamy, self-fertilise. Some are benthic, but most are pelagic swimmers (nektonic). A clade of Aulopiformes, the suborder Enchodontoidei and its many constituent families, were dominant nektonic fish throughout much of the Late Cretaceous before the extinction of most of their members around the K–Pg event, with the Dercetidae surviving for some time in the Cenozoic. Taxonomy Past authors have ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anotopterus Nikparini
''Anotopterus nikparini'' is a species of fish in the family Anotopteridae, the daggertooths. It is native to the northern Pacific Ocean, where it occurs as far north as the Bering Sea and as far south as Japan and Baja California.Froese, R. and D. Pauly, Editors''Anotopterus nikparini''.FishBase. 2015. This fish can be found near the surface to depths below 2000 meters. Populations in colder regions are mainly larger, older adults. This species feeds on molluscs, crustaceans, marine worms, salp A salp (: salps, also known colloquially as “sea grape”) or salpa (: salpae or salpas) is a barrel-shaped, Plankton, planktonic tunicate in the family Salpidae. The salp moves by contracting its gelatinous body in order to pump water thro ...s, and fish. It is an important predator of Pacific salmon.Nagasawa, K., Azumaya, T., & Yoshida, Y. (2002)Impact of predation by salmon sharks (''Lamna ditropis'') and daggertooth (''Anotopterus nikparini'') on Pacific salmon (''Oncorhync ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barracudina
Barracudinas are any member of the marine mesopelagic fish family Paralepididae: 50 or so extant species are found almost worldwide in deep waters. Several genera, including '' Holosteus'' and '' Drimys'', are known only from fossils dating back to the Ypresian epoch. The generic name ''Paralepis'' (for which the family is named) is from Greek - ''para'' meaning "somewhat", ' meaning "scaled". Description Barracudinas are elongated, slender fish with large eyes, and a pointed snout containing fang-like teeth. This gives them some superficial resemblance to barracudas (family Sphyraenidae), although the two groups are not closely related. Barracudinas are actually related to lizardfish (order Aulopiformes; suborder Alepisauroidei) and are most closely aligned with lancetfish (family Alepisauridae), hammerjaws (family Omosudidae) and daggertooths (family Anotopteridae). Like their close relatives, barracudinas lack swim bladders and are simultaneous hermaphrodites, a re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paralepididae
Barracudinas are any member of the marine mesopelagic fish family (biology), family Paralepididae: 50 or so extant species are found almost worldwide in deep waters. Several genera, including ''Holosteus'' and ''Drimys (fish), Drimys'', are known only from fossils dating back to the Ypresian epoch. The generic term, generic name ''Paralepis'' (for which the family is named) is from Greek language, Greek - ''para'' meaning "somewhat", ' meaning "scaled". Description Barracudinas are elongated, slender fish with large eyes, and a pointed snout containing fang-like teeth. This gives them some superficial resemblance to barracudas (family Sphyraenidae), although the two groups are not closely related. Barracudinas are actually related to lizardfish (order Aulopiformes; suborder Alepisauroidei) and are most closely aligned with lancetfish (family Alepisauridae), hammerjaws (family Omosudidae) and daggertooths (family Anotopteridae). Like their close relatives, barracudinas lack s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tuna
A tuna (: tunas or tuna) is a saltwater fish that belongs to the tribe Thunnini, a subgrouping of the Scombridae ( mackerel) family. The Thunnini comprise 15 species across five genera, the sizes of which vary greatly, ranging from the bullet tuna (max length: , weight: ) up to the Atlantic bluefin tuna (max length: , weight: ), which averages and is believed to live up to 50 years. Tuna, opah, and mackerel sharks are the only species of fish that can maintain a body temperature higher than that of the surrounding water. An active and agile predator, the tuna has a sleek, streamlined body, and is among the fastest-swimming pelagic fish—the yellowfin tuna, for example, is capable of speeds of up to . Greatly inflated speeds can be found in early scientific reports and are still widely reported in the popular literature. Found in warm seas, the tuna is commercially fished extensively as a food fish, and is popular as a bluewater game fish. As a result of overfishi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oncorhynchus
''Oncorhynchus'', from Ancient Greek ὄγκος (''ónkos''), meaning "bend", and ῥύγχος (''rhúnkhos''), meaning "snout", is a genus of ray-finned fish in the subfamily Salmoninae of the family (biology), family Salmonidae, native to coldwater tributaries of the North Pacific basin. The genus contains twelve extant taxon, extant species, namely six species of Pacific salmon and six species of Pacific trout, all of which are fish migration, migratory (either anadromous or potamodromous) mid-trophic level, level predatory fish that display natal homing and semelparity. The name of the genus is derived from Ancient Greek ὄγκος (''ónkos''), meaning "bend", and ῥύγχος (''rhúnkhos''), meaning "snout", in reference to the hooked secondary sexual characteristic — known as the kype — that the males develop on the lower jaw tip during mating season. Range Salmon and trout within ''Oncorhynchus'' are native to the tributaries of the North Pacific Ocean, with th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
