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Hydrocynus forskahlii és una espècie de peix de la família dels alèstids i de l'ordre dels caraciformes.
Menja peixos, insectes, herba i caragols.[8]
És depredat pel pigarg africà (Haliaeetus vocifer).[8]
És un peix d'aigua dolça i de clima tropical.[7]
Es troba a Àfrica.[7][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]
Hydrocynus forskahlii és una espècie de peix de la família dels alèstids i de l'ordre dels caraciformes.
Hydrocynus forskahlii, engl. Elongate Tigerfish, gehört zu den afrikanischen Tigersalmlern.
Hydrocynus forskahlii ist weiter verbreitet als andere Hydrocynus-Arten und kommt in West- und Zentralafrika vor. Zu seinen Verbreitungsgebieten gehört der Nil, Volta, der Albertsee (Albert Nyanza), Turkanasee, Gandjule-See[1] und viele andere Gewässer. Die Fischart ist in Senegal, Niger, Elfenbeinküste, Guinea, Kamerun, Demokratische Republik Kongo, Ghana, Liberia, Benin, Gambia, Tschad und Sierra Leone verbreitet.[2]
Die Fische können bis 80 Zentimeter lang und 15 Kilogramm schwer werden. Sie erreichen dabei eine maximale Lebenserwartung von vier Jahren.[2] Ihr Körper ist langgestreckt und hat eine silbrige bis graue Färbung. Ihre Flossen sind teilweise rot gefärbt.
Hydrocynus forskahlii bildet kleine Schwärme, bzw. Schulen. Als Raubfisch jagt er häufig oberflächennah Beutefische, wobei langgestreckte Fischarten (Heringe, Buntbarsche und Afrikanische Salmler[3]), die leicht heruntergeschluckt werden können, bevorzugt werden.[2] Untersuchungen des Mageninhaltes haben ergeben, dass Fisch seine bevorzugte Beute ist.[3] Außerdem frisst Hydrocynus forskahlii Insekten, Schnecken und sogar Gras. Unter bestimmten Umständen verhält sich H. forskahlii kannibalisch. Zu seinen Feinden gehört der Schreiseeadler (Haliaeetus vocifer).[2] Laichwanderungen wurden in den Nebenflüssen der Kariba-Talsperre während der Regenzeit beobachtet.[2]
Hydrocynus forskahlii, engl. Elongate Tigerfish, gehört zu den afrikanischen Tigersalmlern.
Hydrocynus forskahlii, the elongate tigerfish, is a species of predatory characin from the family Alestidae which is found in northern and western Africa.
Hydrocynus forskahlii has pronounced stripes along the length of the body. There are two scales between the pelvic fin insertion and the lateral line, less than for other species of tigerfish such as Hydrocynus brevis which has 23-5 scales in the same position. The lateral line scale count is between 46 and 53 scales and the anal fin ray count is 3 soft, unbranched rays with 11-14 branched rays. It is a slenderer species than other Hydrocynus and the depth of the body averages 22.6 per cent of its length and the head averages around 20 per cent of the body length. It has 9 to 14 teeth in the upper jaw and 8 to 12 in the lower jaw and the jaws are frequently short and upturned. They are similar in colour and pattern to Hydrocynus vittatus being bright, silvery white in color, but with a grayish tail that has red, orange or yellow colour only on its lower lobe.[5]
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They are normally less than 30 cm in length, although large specimens may be 45 cm and they normally weigh about 2.3 kg, the world record rod caught specimen was 4.08233 kg.[5] Although a maximum weight of 15.5 kg has been reported.[2]
Hydrocynus forskahlii is found in central Africa in Lake Albert, Lake Turkana and Lake Gandjule and in the Congo River, Omo River and Nile. In West Africa it occurs in the Chad Basin, Niger River, Benue River west to the Senegal River and River Gambia. It is also present in coastal river basisn and in the Cross River basin, Wouri River and Sanaga River.[2] In some basins it is sympatric with Hydrocynus brevis.[5]
Hydrocynus forskahlii is a pelagic, potamodromous species of open water, it prefers the well oxygenated surface waters.[1]
Little known, the sources quoted in Fishbase and the IUCN Red List of Threatened Species for the behaviour of Hydrocynus forskahlii appear to refer to Hydrocynus vittatus in Lake Kariba.[1][2] The West African pike characin Hepsetus odoe avoids competition with and predation by Hydrocynus forskhali by showing a preference for the upper courses of rivers where H. forskahli is less abundant or is absent.[6] In Lake Kainji, Nigeria, Hydrocynus forskahlii preys mainly on small clupeids however the largest specimens feed more heavily on the characid Alestes baremoze.[7]
Hydrocynus forskahlii was previously considered synonymous with Hydrocynus vittatus sensu lato, hence the confusion mentioned under Ecology above, but this view is not supported by recent molecular studies. In fact, it is suggested that there are two species within the lineage currently recognised as H. forskahlii, with the newly identified lineage being confined to the Sanaga River.[8]
The generic name Hydrocynus is from the Greek hydro meaning water and kyon meaning dog and is a direct translation of the Egyptian Arabic name for this species Kelb el bahr, or water dog. The specific name commemorates the Swedish explorer and naturalist Peter Forsskål.[9]
Hydrocynus forskahlii is preserved by salting, especially in Upper Egyptian Nile, but most are now imported as salted fish from Sudan.[1] Tigerfish are rare in the aquarium trade but this species is the most commonly traded and kept species.[5] As Hydrocynus forskahlii is a commercially important species it suffers from heavy fishing pressure. In addition it is threatened by dams, water pollution, groundwater extraction and drought.[1]
{{cite journal}}: External link in |postscript=Hydrocynus forskahlii, the elongate tigerfish, is a species of predatory characin from the family Alestidae which is found in northern and western Africa.
Hydrocynus forskahlii es una especie de peces de la familia Alestiidae en el orden de los Characiformes.
Los machos pueden llegar alcanzar los 78 cm de longitud total[1] y 15,5 kg de peso.[2][3]
Come peces, insectos, hierba y caracoles.
Es depredado por (Haliaeetus vociferan ).
Es un pez de agua dulce y de clima tropical.
Se encuentran en África.
Hydrocynus forskahlii es una especie de peces de la familia Alestiidae en el orden de los Characiformes.
Hydrocynus forskahlii Hydrocynus generoko animalia da. Arrainen barruko Actinopterygii klasean sailkatzen da, Alestidae familian.
Hydrocynus forskahlii Hydrocynus generoko animalia da. Arrainen barruko Actinopterygii klasean sailkatzen da, Alestidae familian.
Hydrocynus forskahlii is een straalvinnige vissensoort uit de familie van Afrikaanse karperzalmen (Alestidae).[2] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1819 door Cuvier.
De soort staat op de Rode Lijst van de IUCN als niet bedreigd, beoordelingsjaar 2009.[1]
Bronnen, noten en/of referenties
福氏狗脂鯉為輻鰭魚綱脂鯉目脂鯉亞目鮭脂鯉科的其中一種，為熱帶淡水魚，分布於非洲西部淡水流域、尼羅河、艾伯特湖等流域，體長可達78公分，棲息在開放水域，以魚類、昆蟲等為食，生活習性不明，可作為食用魚。
这是一篇關於魚類的小作品。你可以通过编辑或修订扩充其内容。 