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- Black_ghost_knifefish abstract "The black ghost knifefish, Apteronotus albifrons, is a tropical fish belonging to the ghost knifefish family (Apteronotidae). They originate in South America in the Amazon Basin in Peru and from Venezuela through Paraguay in the Paraná River. They are becoming 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 20 in (50 cm). It does not have scales.Black ghost knife fish 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 subdominant 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.".
- Black_ghost_knifefish binomialAuthority Carl_Linnaeus.
- Black_ghost_knifefish class Actinopterygii.
- Black_ghost_knifefish family Ghost_knifefish.
- Black_ghost_knifefish genus Apteronotus.
- Black_ghost_knifefish kingdom Animal.
- Black_ghost_knifefish order Gymnotiformes.
- Black_ghost_knifefish phylum Chordate.
- Black_ghost_knifefish thumbnail Black_Ghost_Knife_Fish_700.jpg?width=300.
- Black_ghost_knifefish wikiPageExternalLink black-ghost-knife-fish-apteronotus-albifrons-linnaeus-1766.
- Black_ghost_knifefish wikiPageExternalLink www.neuromech.northwestern.edu.
- Black_ghost_knifefish wikiPageID "1163775".
- Black_ghost_knifefish wikiPageRevisionID "595754616".
- Black_ghost_knifefish accessdate "2005-06-29".
- Black_ghost_knifefish binomial "Apteronotus albifrons".
- Black_ghost_knifefish classis Actinopterygii.
- Black_ghost_knifefish familia Ghost_knifefish.
- Black_ghost_knifefish genus "Apteronotus".
- Black_ghost_knifefish hasPhotoCollection Black_ghost_knifefish.
- Black_ghost_knifefish id "163328".
- Black_ghost_knifefish month "May".
- Black_ghost_knifefish name "Black ghost knifefish".
- Black_ghost_knifefish ordo Gymnotiformes.
- Black_ghost_knifefish phylum Chordate.
- Black_ghost_knifefish regnum "Animalia".
- Black_ghost_knifefish species "A. albifrons".
- Black_ghost_knifefish species "albifrons".
- Black_ghost_knifefish taxon "Apteronotus albifrons".
- Black_ghost_knifefish year "2005".
- Black_ghost_knifefish subject Category:Apteronotidae.
- Black_ghost_knifefish subject Category:Fishkeeping.
- Black_ghost_knifefish subject Category:Weakly_electric_fish.
- Black_ghost_knifefish type Animal.
- Black_ghost_knifefish type Eukaryote.
- Black_ghost_knifefish type Fish.
- Black_ghost_knifefish type Species.
- Black_ghost_knifefish type Animal.
- Black_ghost_knifefish type BiologicalLivingObject.
- Black_ghost_knifefish type EukaryoticCell.
- Black_ghost_knifefish type Fish.
- Black_ghost_knifefish type Organism.
- Black_ghost_knifefish comment "The black ghost knifefish, Apteronotus albifrons, is a tropical fish belonging to the ghost knifefish family (Apteronotidae). They originate in South America in the Amazon Basin in Peru and from Venezuela through Paraguay in the Paraná River. They are becoming 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.".
- Black_ghost_knifefish label "Apteronotus albifrons".
- Black_ghost_knifefish label "Apteronotus albifrons".
- Black_ghost_knifefish label "Apteronotus albifrons".
- Black_ghost_knifefish label "Black ghost knifefish".
- Black_ghost_knifefish label "Duch brazylijski".
- Black_ghost_knifefish label "Ituí-cavalo".
- Black_ghost_knifefish label "Weißstirn-Messerfisch".
- Black_ghost_knifefish label "Чёрная ножетелка".
- Black_ghost_knifefish label "بلاك جوست نيف فيش".
- Black_ghost_knifefish sameAs Weißstirn-Messerfisch.
- Black_ghost_knifefish sameAs Apteronotus_albifrons.
- Black_ghost_knifefish sameAs Apteronotus_albifrons.
- Black_ghost_knifefish sameAs Apteronotus_albifrons.
- Black_ghost_knifefish sameAs Apteronotus_albifrons.
- Black_ghost_knifefish sameAs Duch_brazylijski.
- Black_ghost_knifefish sameAs Ituí-cavalo.
- Black_ghost_knifefish sameAs m.04cm3_.
- Black_ghost_knifefish sameAs Q1421523.
- Black_ghost_knifefish sameAs Q1421523.
- Black_ghost_knifefish wasDerivedFrom Black_ghost_knifefish?oldid=595754616.
- Black_ghost_knifefish depiction Black_Ghost_Knife_Fish_700.jpg.
- Black_ghost_knifefish isPrimaryTopicOf Black_ghost_knifefish.
- Black_ghost_knifefish name "Black ghost knifefish".