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Die Clanwilliam-rooivlerkie (Barbus calidus) is 'n varswatervis wat endemies is aan die Olifantsrivier in die Namakwaland van die Wes-Kaap. In Engels staan die vis bekend as die Clanwilliam redfin.
Die vis se kop is gepunt met groot oë en daar is ook twee baarde om die mond. Die vis is bruin aan die bokant, silwer aan die onderkant met 'n breë donker band wat horisontaal strek oor die lyf vanaf die kieue tot by die stert. Daar is onreëlmatige donker kolle op die bokant van die vis. Die basis van die vinne is helderrooi. Die vis word 82 mm lank.
Die vis leef in groot, diep poele in helder strome. Hulle vreet hoofsaaklik insekte wat hulle vang op die wateroppervlakte. Gedurende die broeiseisoen in die somer, ontwikkel beide geslagte tuberkels op die kop en rug.
Die spesie is bedreigd en word deur die IUBN geklassifiseer as 'n kwesbare spesie. Hul grootste vyand is die uitheemse baars, familie Micropterus.
Die Clanwilliam-rooivlerkie (Barbus calidus) is 'n varswatervis wat endemies is aan die Olifantsrivier in die Namakwaland van die Wes-Kaap. In Engels staan die vis bekend as die Clanwilliam redfin.
The Clanwilliam redfin (Pseudobarbus calidus), is a ray-finned fish species in the family Cyprinidae.[2] It is placed with the South African redfins in Pseudobarbus. It is tetraploid. Its closest living relative is probably the Twee River redfin (P. erubescens).[3]
It is endemic to the Western Cape Province of South Africa, where it occurs in the upper Olifants River and its tributaries – the Biedou, Boontjies, Boskloof, Breekkrans, Driehoeks, Dwars, Eselbank, Jan Dissels, Matijes, Noordhoeks, Oudste, Ratels, Rondegat, Thee and Tra Tra Rivers – near Clanwilliam and Keerom.[1]
It inhabits the pools and shallower water in larger clear and slightly acidic mountain streams. They are insectivores, eating mainly small mayflies (Baetidae), non-biting midges (Chironomidae) and ants (Formicidae). The breeding season is lengthy and lasts most of the summer, from November to January. Schools of adults form to migrate to shallow pools with slow-moving water and spawn between rocks and boulders, depositing the eggs in crevices between these.[4]
This species is considered Near Threatened by the IUCN, mainly due to the adverse impact of the introduced smallmouth bass (Micropterus dolomieu) on its population. The most drastic declines have been in the past, and though the species is still declining it is not doing so at an alarming rate; wherever the bass has not become established yet it is actually rather plentiful. Bluegills (Lepomis macrochirus) and rainbow trouts (Oncorhynchus mykiss) are other introduced species that are significant as predators of younger Clanwilliam redfins. Banded Tilapia (Tilapia sparrmanii) is yet another introduced fish that has an adverse effect on the stocks of B. calidus, in its case due to competition for food. The other main threat is water pollution and other forms of unsustainable water use. Particularly the conversion of riparian lands for citrus plantations, with the resultant uninhibited runoff of pesticides and fertilizers, is considered very harmful.[4]
The Clanwilliam redfin occurs in the Cederberg Wilderness Area and the Matjies River Nature Reserve, where it is at least safe from habitat destruction. It is listed as Endangered by the Nature Conservation Ordinance of Western Cape Province. For the time being, it may not be killed or caught. The species is on display in public aquaria of Cape Town, Clanwilliam and Jonkershoek to educate the public on its conservation needs.[4]
The Clanwilliam redfin (Pseudobarbus calidus), is a ray-finned fish species in the family Cyprinidae. It is placed with the South African redfins in Pseudobarbus. It is tetraploid. Its closest living relative is probably the Twee River redfin (P. erubescens).
Barbus calidus es una especie de peces de la familia de los Cyprinidae en el orden de los Cypriniformes.
Los machos pueden llegar alcanzar los 8,2 cm de longitud total.[2]
Es un pez de agua dulce.[1][2]
Se encuentran en la cuenca del río Olifants, en Sudáfrica.[1][2]
Datos: Q302374
Barbus calidus es una especie de peces de la familia de los Cyprinidae en el orden de los Cypriniformes.
Barbus calidus Barbus generoko animalia da. Arrainen barruko Actinopterygii klasean sailkatzen da, Cyprinidae familian.
Barbus calidus Barbus generoko animalia da. Arrainen barruko Actinopterygii klasean sailkatzen da, Cyprinidae familian.
Pseudobarbus calidus é uma espécie de peixe actinopterígeo da família Cyprinidae.
Apenas pode ser encontrada na África do Sul.
Pseudobarbus calidus é uma espécie de peixe actinopterígeo da família Cyprinidae.
Apenas pode ser encontrada na África do Sul.
