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- Apteronotus albifrons és una espècie de peix pertanyent a la família dels apteronòtids. (ca)
- سمك سكين الشبح الأسود أو السمكة الفراشة (الاسم العلمي Notopterus Chitala: ويعني ريشة الظهر وهو اسم دارج للسمكة لأن الزعنفة الظهرية للسمكة تشبه الريشة، زأيضا تسمي سمكة السكين لأن شكلها الانسيابي يشبه السكين وهي تنتمي الي عائلة Notopteridae وتصنف هذه السمكه ضمن الأسماك المفترسة. موطن السمكة جنوب شرق آسيا، جنوب أفريقيا، أندونيسيا، والهند، وتم تربيتها بعد ذلك في تايلاند والهند الصينية وماليزيا. تتميز هذه السمكة بالحجم الكبير وذلك لأن عمرها طويل وتتحمل الظروف القاسية وسرعه النمو، وأيضا من أهم ما يميز هذه السمكة الهدوء التام طالما انه يوجد إضاءه، لأنها لاتتحرك إلا في الليل. السمكة لا تأكل الا في اليل فتتربص بفريستها وتهاجم عن طريق عمل مجال مغناطيسي. (ar)
- Der Weißstirn-Messerfisch (Apteronotus albifrons) ist ein Süßwasserfisch aus der Ordnung der Neuwelt-Messerfische (Gymnotiformes). Er kommt in Südamerika östlich der Anden vom Orinoko bis zum Río de la Plata und im westlich der Anden gelegenen Río Magdalena vor. (de)
- The black ghost knifefish (Apteronotus albifrons) is a tropical fish belonging to the ghost knifefish family (Apteronotidae). They originate in freshwater habitats in South America where they range from Venezuela to the Paraguay–Paraná River, including the Amazon Basin. They are popular in aquaria. The fish is all black except for two white rings on its tail, and a white blaze on its nose, which can occasionally extend into a stripe down its back. It moves mainly by undulating a long fin on its underside. It will grow to a maximum length of 50 cm (20 in). Black ghost knifefish are nocturnal. They are a weakly electric fish which use an electric organ and receptors distributed over the length of their body in order to locate insect larvae. The black ghost knifefish natively lives in fast moving, sandy bottom creeks in a tropical climate. South American natives believe that the ghosts of the departed take up residence in these fish, hence the name. The black ghost knifefish is a weakly electric fish as a result of the electromotor and electrosensory systems it possesses. While some fish can only receive electric signals, the black ghost knifefish can both produce and sense the electrical impulses. Electrogenesis occurs when a specialized electric organ found in the tail of the fish generates electrical signals, which are thus called electric organ discharges (EODs). Then, for these EODs to be sensed by the fish, electroreception occurs when groups of sensory cells embedded in the skin, known as electroreceptor organs, detect the electrical change. The EODs are used for two major purposes: electrolocation and communication. The kind of EOD produced can be used to distinguish between two types of weakly electric fish: the pulse-type and the wave-type. The black ghost knifefish are considered to be the latter type, because they can continuously generate EODs in small intervals. Wave-type EODs have a narrow power spectra, and can be heard as a tonal sound, where the discharge rate establishes the fundamental frequency. By emitting its own continuous sinusoidal train of EODs, the fish can determine the presence of nearby objects by sensing perturbations in timing and amplitude of electric fields, an ability known as active electrolocation. The particular organs used to sense the self-generated high-frequency EODs are tuberous electroreceptor organs. On the other hand, when low-frequency electric fields are generated by external sources instead of the fish itself, a different class of electroreceptor organs is used for this passive electrolocation, called ampullary organs. Therefore, the black ghost knifefish uses an active and a passive electrosystem, each with its own corresponding receptor organs. The fish can also use a mechanosensory lateral line system, which detects water disturbances created by the motion of the fish's body. As nocturnal hunters, the fish can rely on all three systems to navigate through dark environments and detect their prey. Each species has a characteristic EOD baseline frequency range, which varies with sex and age within the species, as well. The baseline frequency is maintained to be almost constant at stable temperature, but will usually be changed due to the presence of others of the same species. Such changes in frequency relevant to social interaction are called frequency modulations (FMs). The role these FMs have in communication is significant, as black ghost knifefish have developed jamming avoidance responses, which are behavioral responses that avoid the overlapping of EOD frequencies between conspecific individuals to prevent sensory confusion. Moreover, a study was conducted that focused on sexual dimorphism in electrocommunication signals. Female black ghost knifefish generate EODs at a higher frequency than the males, an FM which can be used for gender recognition. A study found the subordinate black ghost knifefish exhibited noticeable gradual frequency rises (GFRs) in their EODs whereas the dominant fish did not, supporting the researchers' hypothesis that GFRs during communication are indicative of submissive signals. It is possible to use a device to convert a captive fish's electrical signals into audible sound, allowing listeners to hear the fish "talk". The Bakken Museum in Minneapolis has a display with such a device and a black ghost knifefish. (en)
- Apteronotus albifrons generoko animalia da. Arrainen barruko Actinopterygii klasean sailkatzen da, Apteronotidae familian. (eu)
- Apteronotus albifrons es una especie de pez de agua dulce del género Apteronotus de la familia Apteronotidae, en el orden de los Gymnotiformes. Es denominada comúnmente morena negra, cherogá, cuchillo, caballo, etc. Se distribuye en ambientes acuáticos de Sudamérica cálida. Es un pez habitualmente comercializado para acuariofilia. (es)
- Apteronotus albifrons est une espèce de poissons gymnotiformes de la famille des Apteronotidae. On trouve ce poisson au Venezuela et dans l'Amazone. (fr)
- Apteronotus albifrons is een straalvinnige vissensoort uit de familie van de staartvinmesalen (Apteronotidae). De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1766 door Linnaeus. (nl)
- Apteronotus albifrons (Linnaeus, 1766) è un pesce tropicale della famiglia .È originario del Sudamerica, del bacino amazzonico in Perù e Venezuela fino al fiume Paraná in Paraguay. Sta diventando diffuso negli acquari, nonostante richieda acquari grandi (almeno 3 metri) con acqua corrente molto ossigenata e alimentazione a base di prede vive. Si muove ondulando la lunga pinna sul ventre. Può raggiungere e superare la lunghezza di 50 cm. Non ha squame, la colorazione è nera tranne che per due anelli bianchi sulla coda e una macchia bianca sul dorso. È un animale notturno; è un pesce debolmente elettrico, che utilizza un organo elettrico e i recettori posti sulla lunghezza del corpo per localizzare le larve degli insetti. (it)
- O Ituí-cavalo ou Fantasma-negro, Apteronotus albifrons, é um peixe tropical pertencente à família Apteronotidae. São nativos da Bacia Amazônica na América do Sul, no rio Paraná através do Peru, Venezuela e Paraguai. Gozam de popularidade crescente em aquários. O peixe é todo preto, exceto por dois anéis brancos na cauda, e uma mancha branca na cabeça, que pode se estender até as costas. Se move principalmente ondulando uma longa barbatana ventral, e pode crescer até 60 centímetros. São noturnos, dotados de uma leve corrente elétrica, e como são cegos (os olhos são cobertos por pele), utilizam um órgão elétrico e receptores distribuídos pelo corpo para localizar larvas de insetos. Tendem a nadar "de pé", com a cauda para baixo, e de maneira um tanto desordenada. Junto com o peixe-elefante eles são os peixes eletrosensíveis mais estudados. O Ituí-cavalo vive em águas rápidas, com fundo arenoso em climas tropicais. Preferem águas com pH em torno de 6.0 - 8.0, dureza da água entre 5.0 - 19.0 dGH, e temperatura entre 23-28 °C. Existem lendas entre alguns povos da região amazônica de que as almas dos mortos habitavam estes peixes, daí um dos nomes. (pt)
- Duch brazylijski, duch amazoński (Apteronotus albifrons) – gatunek słodkowodnej ryby z rzędu Gymnotiformes i rodziny Apteronotidae, aktywnie wykorzystującej zmysł elektrorecepcji, hodowany w akwariach. (pl)
- Apteronotus albifrons är en fiskart som först beskrevs av Carl von Linné 1766. Apteronotus albifrons ingår i släktet Apteronotus och familjen Apteronotidae. Inga underarter finns listade i Catalogue of Life. (sv)
- Чёрная ножетелка, хвостопёрая ножетелка, или чёрный нож (лат. Apteronotus albifrons) — рыба семейства . Обитает в районах Бразилии, Перу, Боливии, Колумбии. (ru)
- 線翎電鰻，為輻鰭魚綱電鰻目線翎電鰻科的一種，為熱帶淡水魚，卵生，分布於南美洲巴拉圭河及巴拉那河流域，體長可達50公分，棲息在沙底質溪流底中層水域，在觀賞魚中頗受歡迎。牠的身體上沒有鱗片，尾部有兩個白色的環狀條紋，鼻子上的白色斑紋有些會延續到尾部。因为沒有背鰭，線翎電鰻會藉著擺動身體下側的旗狀魚鰭移動，泳姿優美且獨特。 身體下側的裙帶狀魚鰭，则能够使牠自在的向前、向後及垂直移動。 (zh)
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- Apteronotus albifrons és una espècie de peix pertanyent a la família dels apteronòtids. (ca)
- سمك سكين الشبح الأسود أو السمكة الفراشة (الاسم العلمي Notopterus Chitala: ويعني ريشة الظهر وهو اسم دارج للسمكة لأن الزعنفة الظهرية للسمكة تشبه الريشة، زأيضا تسمي سمكة السكين لأن شكلها الانسيابي يشبه السكين وهي تنتمي الي عائلة Notopteridae وتصنف هذه السمكه ضمن الأسماك المفترسة. موطن السمكة جنوب شرق آسيا، جنوب أفريقيا، أندونيسيا، والهند، وتم تربيتها بعد ذلك في تايلاند والهند الصينية وماليزيا. تتميز هذه السمكة بالحجم الكبير وذلك لأن عمرها طويل وتتحمل الظروف القاسية وسرعه النمو، وأيضا من أهم ما يميز هذه السمكة الهدوء التام طالما انه يوجد إضاءه، لأنها لاتتحرك إلا في الليل. السمكة لا تأكل الا في اليل فتتربص بفريستها وتهاجم عن طريق عمل مجال مغناطيسي. (ar)
- Der Weißstirn-Messerfisch (Apteronotus albifrons) ist ein Süßwasserfisch aus der Ordnung der Neuwelt-Messerfische (Gymnotiformes). Er kommt in Südamerika östlich der Anden vom Orinoko bis zum Río de la Plata und im westlich der Anden gelegenen Río Magdalena vor. (de)
- Apteronotus albifrons generoko animalia da. Arrainen barruko Actinopterygii klasean sailkatzen da, Apteronotidae familian. (eu)
- Apteronotus albifrons es una especie de pez de agua dulce del género Apteronotus de la familia Apteronotidae, en el orden de los Gymnotiformes. Es denominada comúnmente morena negra, cherogá, cuchillo, caballo, etc. Se distribuye en ambientes acuáticos de Sudamérica cálida. Es un pez habitualmente comercializado para acuariofilia. (es)
- Apteronotus albifrons est une espèce de poissons gymnotiformes de la famille des Apteronotidae. On trouve ce poisson au Venezuela et dans l'Amazone. (fr)
- Apteronotus albifrons is een straalvinnige vissensoort uit de familie van de staartvinmesalen (Apteronotidae). De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1766 door Linnaeus. (nl)
- Duch brazylijski, duch amazoński (Apteronotus albifrons) – gatunek słodkowodnej ryby z rzędu Gymnotiformes i rodziny Apteronotidae, aktywnie wykorzystującej zmysł elektrorecepcji, hodowany w akwariach. (pl)
- Apteronotus albifrons är en fiskart som först beskrevs av Carl von Linné 1766. Apteronotus albifrons ingår i släktet Apteronotus och familjen Apteronotidae. Inga underarter finns listade i Catalogue of Life. (sv)
- Чёрная ножетелка, хвостопёрая ножетелка, или чёрный нож (лат. Apteronotus albifrons) — рыба семейства . Обитает в районах Бразилии, Перу, Боливии, Колумбии. (ru)
- 線翎電鰻，為輻鰭魚綱電鰻目線翎電鰻科的一種，為熱帶淡水魚，卵生，分布於南美洲巴拉圭河及巴拉那河流域，體長可達50公分，棲息在沙底質溪流底中層水域，在觀賞魚中頗受歡迎。牠的身體上沒有鱗片，尾部有兩個白色的環狀條紋，鼻子上的白色斑紋有些會延續到尾部。因为沒有背鰭，線翎電鰻會藉著擺動身體下側的旗狀魚鰭移動，泳姿優美且獨特。 身體下側的裙帶狀魚鰭，则能够使牠自在的向前、向後及垂直移動。 (zh)
- The black ghost knifefish (Apteronotus albifrons) is a tropical fish belonging to the ghost knifefish family (Apteronotidae). They originate in freshwater habitats in South America where they range from Venezuela to the Paraguay–Paraná River, including the Amazon Basin. They are popular in aquaria. The fish is all black except for two white rings on its tail, and a white blaze on its nose, which can occasionally extend into a stripe down its back. It moves mainly by undulating a long fin on its underside. It will grow to a maximum length of 50 cm (20 in). (en)
- Apteronotus albifrons (Linnaeus, 1766) è un pesce tropicale della famiglia .È originario del Sudamerica, del bacino amazzonico in Perù e Venezuela fino al fiume Paraná in Paraguay. Sta diventando diffuso negli acquari, nonostante richieda acquari grandi (almeno 3 metri) con acqua corrente molto ossigenata e alimentazione a base di prede vive. Si muove ondulando la lunga pinna sul ventre. Può raggiungere e superare la lunghezza di 50 cm. Non ha squame, la colorazione è nera tranne che per due anelli bianchi sulla coda e una macchia bianca sul dorso. (it)
- O Ituí-cavalo ou Fantasma-negro, Apteronotus albifrons, é um peixe tropical pertencente à família Apteronotidae. São nativos da Bacia Amazônica na América do Sul, no rio Paraná através do Peru, Venezuela e Paraguai. Gozam de popularidade crescente em aquários. O peixe é todo preto, exceto por dois anéis brancos na cauda, e uma mancha branca na cabeça, que pode se estender até as costas. Se move principalmente ondulando uma longa barbatana ventral, e pode crescer até 60 centímetros. (pt)
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