Clanwilliam redfin | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Actinopterygii |
Order: | Cypriniformes |
Family: | Cyprinidae |
Subfamily: | Smiliogastrinae |
Genus: | Sedercypris |
Species: | S. calidus |
Binomial name | |
Sedercypris calidus Barnard, 1938 | |
Synonyms | |
Barbus calidus |
The Clanwilliam redfin (Sedercypris calidus), is a ray-finned fish species in the family Cyprinidae. [2] It was formerly placed with the South African redfins in Pseudobarbus . It is tetraploid. Its closest living relative is the Twee River redfin (S. 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. [1]
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 S. 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. [1]
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. [1]
The spotted bass, also called spotty, or spots in various fishing communities, is a species of North American freshwater fish belonging to the sunfish family (Centrarchidae) of the order Perciformes. It is noted for the rows of dark spots below the lateral line, which give it its common name. One of the black basses, it is native to the Mississippi River basin and across the Gulf states, from central Texas through the Florida panhandle. Its native range extends into the western Mid-Atlantic states and it has been introduced into western North Carolina and Virginia. It has also been introduced to southern Africa, where it has become established in some isolated waters as an invasive species.
The Olifants River is a river in the northwestern area of the Western Cape Province of South Africa. The upper and main catchment area of the Olifants river is around Ceres and the Cederberg mountains. The Clanwilliam and Bulshoek dams are located on the river and provide water for the towns and farms along the watercourse. The river is approximately 285 km long with a catchment area of 46,220 km2. It flows into the Atlantic Ocean at Papendorp, 250 km north of Cape Town.
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The Twee River redfin or simply Twee redfin is a ray-finned fish species in the family Cyprinidae. It was formerly placed with the South African redfins in Pseudobarbus. It is tetraploid. Its closest living relative is the Clanwilliam redfin.
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Sedercypris, commonly known as Cedarberg redfins, is a genus of fish in the family Cyprinidae endemic to the Clanwilliam Olifants River system in South Africa.