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Smallmouth Yellowfish
The smallmouth yellowfish (''Labeobarbus aeneus'') is a species of ray-finned fish in the genus '' Labeobarbus''. It has become an invasive species in rivers of the Eastern Cape, South Africa, such as the Mbhashe River. Introduction The Orange- Vaal River system is one of the few in South Africa that is truly international. The source of the Orange river is in Lesotho and that of the Vaal on the Mpumalanga highveld whereas their tributaries extend well into most provinces of South Africa as well as into Botswana and Namibia. The Orange river eventually flows into the Atlantic Ocean at Oranjemund on the West coast border between South Africa and Namibia. The river drains hugely diverse terrestrial habitat types ranging from grasslands, mountains and karoo to desert. This results in diverse riverine habitats that include clear mountain streams, turbid waters of the middle Orange river and the nutrient-rich discoloured water of the lower reaches of both rivers. Several in s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William John Burchell
__NOTOC__ William John Burchell (23 July 1781 – 23 March 1863) was an English explorer, naturalist, traveller, artist, and author. His thousands of plant specimens, as well as field journals from his South African expedition, are held by Kew Gardens, and his insect collection by the Oxford University Museum. Early life and education William John Burchell was born in Fulham, London, the son of Matthew Burchell, botanist and owner of Fulham Nursery, and his wife. His father owned nine and a half acres of land adjacent to the gardens of Fulham Palace. Burchell served a botanical apprenticeship at Kew and was elected F.L.S. (Fellow of the Linnaen Society) in 1803. At about this time, he became enamoured of Lucia Green of Fulham, but faced strong disapproval from his parents when he broached the idea of an engagement. Career On 7 August 1805, Burchell at the age of 24 sailed for St. Helena aboard the East Indiaman intending to set up there as a merchant with a partner from Lo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Botswana
Botswana, officially the Republic of Botswana, is a landlocked country in Southern Africa. Botswana is topographically flat, with approximately 70 percent of its territory part of the Kalahari Desert. It is bordered by South Africa to the south and southeast, Namibia to the west and north, Zambia to the north, and Zimbabwe to the northeast. With a population of slightly over 2.4 million people and a comparable land area to France, Botswana is one of the List of countries and dependencies by population density, most sparsely populated countries in the world. It is essentially the nation-state of the Tswana people, who constitute nearly 80 percent of the population. The Tswana ethnic group are descended mainly from Bantu peoples, Bantu-speaking peoples who Bantu expansion, migrated into southern Africa, including modern Botswana, in several waves before AD 600. In 1885, the British Empire, British colonised the area and declared a protectorate named Bechuanaland. As part of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gariep Dam
The Gariep Dam is located in South Africa, near the town of Norvalspont, bordering the Free State and Eastern Cape provinces. Its primary purpose is for irrigation, domestic and industrial use as well as for power generation. It the largest dam in South Africa. Name The Gariep Dam, at its commission in 1971, was originally named the Hendrik Verwoerd Dam after Hendrik Verwoerd, the Prime Minister before and after 31 May 1961, when the country changed from the Union of South Africa to the Republic of South Africa. However, after the end of apartheid, the Verwoerd name was considered unsuitable. The name was officially changed to Gariep Dam on 4 October 1996. ''Gariep'' is Khoekhoe for "river", the original name of the Orange River (the longest river in South Africa). Location The dam is on the Orange River about north-east of Colesberg and south of Bloemfontein. It is in a gorge at the entrance to the Ruigte Valley some east of Norvalspont. The dam crest is some 1300 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moggel
Moggel (''Labeo umbratus'') is a freshwater African fish in genus Labeo. It occurs within the drainage basin of the Orange River. The species has been recorded in the Vaal River, Olifants River in Mpumalanga and Limpopo, introduced there by anglers. This species is similar to '' L. capensis'' in colour and in its pronounced anterior barbels. It can withstand temperatures below and is mainly found in stagnant water, muddy dams and in large impoundments. Juveniles of the species prey on invertebrates while adults subsist on detritus and mud. It is an important food source and is considered a useful species in wastewater aquaculture Aquaculture (less commonly spelled aquiculture), also known as aquafarming, is the controlled cultivation ("farming") of aquatic organisms such as fish, crustaceans, mollusks, algae and other organisms of value such as aquatic plants (e.g. Nelu ... when combined with other aquatic organisms. Size Length: . Weight: Distribution Africa: within ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carp
The term carp (: carp) is a generic common name for numerous species of freshwater fish from the family (biology), family Cyprinidae, a very large clade of ray-finned fish mostly native to Eurasia. While carp are prized game fish, quarries and are valued (even pisciculture, commercially cultivated) as both food fish, food and ornamental fish in many parts of the Old World, they are considered trash fish and invasive species, invasive pest (organism), pests in many parts of Africa, Australia and most of the United States. Biology The cypriniformes (family Cyprinidae) are traditionally grouped with the Characiformes, Siluriformes, and Gymnotiformes to create the superorder Ostariophysi, since these groups share some common features. These features include being found predominantly in fresh water and possessing Weberian ossicles, an anatomical structure derived from the first five anterior-most vertebrae, and their corresponding ribs and neural crests. The third anterior-most pair ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clarias Gariepinus
''Clarias gariepinus'' or African sharptooth catfish is a species of catfish of the family Clariidae, the airbreathing catfishes. Distribution They are found throughout Africa and the Middle East, and live in freshwater lakes, rivers, and swamps, as well as human-made habitats, such as oxidation ponds or even urban sewage systems. The African sharptooth catfish was introduced all over the world in the early 1980s for aquaculture purposes, so is found in countries far outside its natural habitat, such as Brazil, Vietnam, Indonesia, and India. In countries where native species of ''Clarias'' occur, such as Indonesia, the sharptooth catfish may be distinguished; In Indonesia, it is referred to as ''lele dumbo''. Description The African sharptooth catfish is a large, eel-like fish, usually of dark gray or black coloration on the back, fading to a white belly. In Africa, this catfish has been reported as being second in size only to the vundu of the Zambesian waters, [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Angling
Angling (from Old English ''angol'', meaning "hook") is a fishing technique that uses a fish hook attached to a fishing line to tether individual fish in the mouth. The fishing line is usually manipulated with a fishing rod, although rodless techniques such as handlining also exist. Modern angling rods are usually fitted with a fishing reel that functions as a crank (mechanism), cranking device for storing, retrieving and releasing out the line, although Tenkara fishing and traditional cane pole fishing are two rod-angling methods that do not use any reel. The fish hook itself can be additionally weighted with a denser fishing tackle, tackle called a sinker (fishing), sinker, and is typically dressed with an appetizing bait (luring substance), bait (i.e. hookbait) to attract and entice the fish into swallowing the hook, but sometimes an inedible fake/imitation bait with multiple attached hooks (known as a fishing lure, lure) is used instead of a single hook with edible bait. Som ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South African Police Service
The South African Police Service (SAPS) is the national police force of the Republic of South Africa. Its 1,154 police stations in South Africa are divided according to the Provinces of South Africa, provincial borders, and a Provincial Commissioner is appointed in each province. The nine Provincial Commissioners report directly to the National Commissioner. The head office is in the Wachthuis Building in Pretoria. The Constitution of South Africa lays down that the South African Police Service has a responsibility to prevent, combat and investigate crime, maintain public order, protect and secure the inhabitants of the Republic and their property, uphold and enforce the law, create a safe and secure environment for all people in South Africa, prevent anything that may threaten the safety or security of any community, investigate any crimes that threaten the safety or security of any community, ensure criminals are brought to justice and participate in efforts to address the ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mine Water
Pit water, mine water or mining water is water that collects in a mining, mine and which has to be brought to the surface by water management methods in order to enable the mine to continue working. Origin Although all water that enters pit workings originates from atmospheric precipitation, the miner distinguishes between surface water and groundwater. Surface water enters the pit through openings in the mine at the surface of the ground, such as tunnel portals or shaft entrances. During heavy rain, water seeps into the earth and forms ground water when it meets layers of impervious rock. Pit water is mainly interstitial water and groundwater that seeps into the mine workings.Carl Hartmann: Handwörterbuch der Berg-, Hütten- u. Salzwerkskunde der Mineralogie und Geognosie. Third volume, 2nd edition, Buchhandlung Bernhard Friedrich Voigt, Weimar, 1860 See also * Acid mine drainage Literature * * * * References Water management in mining Underground mining Geoc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diatom
A diatom (Neo-Latin ''diatoma'') is any member of a large group comprising several Genus, genera of algae, specifically microalgae, found in the oceans, waterways and soils of the world. Living diatoms make up a significant portion of Earth's Biomass (ecology), biomass. They generate about 20 to 50 percent of the oxygen produced on the planet each year, take in over 6.7 billion tonnes of silicon each year from the waters in which they live, and constitute nearly half of the organic material found in the oceans. The Protist shell, shells of dead diatoms are a significant component of marine sediment, and the entire Amazon basin is fertilized annually by 27 million tons of diatom shell dust transported by transatlantic winds from the African Sahara, much of it from the Bodélé Depression, which was once made up of a system of fresh-water lakes. Diatoms are unicellular organisms: they occur either as solitary cells or in Colony (biology), colonies, which can take the shape of ribb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Algae
Algae ( , ; : alga ) is an informal term for any organisms of a large and diverse group of photosynthesis, photosynthetic organisms that are not plants, and includes species from multiple distinct clades. Such organisms range from unicellular microalgae, such as cyanobacteria, ''Chlorella'', and diatoms, to multicellular macroalgae such as kelp or brown algae which may grow up to in length. Most algae are aquatic organisms and lack many of the distinct cell and tissue types, such as stomata, xylem, and phloem that are found in embryophyte, land plants. The largest and most complex marine algae are called seaweeds. In contrast, the most complex freshwater forms are the Charophyta, a Division (taxonomy), division of green algae which includes, for example, ''Spirogyra'' and stoneworts. Algae that are carried passively by water are plankton, specifically phytoplankton. Algae constitute a Polyphyly, polyphyletic group because they do not include a common ancestor, and although Eu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karoo
The Karoo ( ; from the Afrikaans borrowing of the South Khoekhoe Khoemana (also known as !Orakobab or Korana) word is a semidesert natural region of South Africa. No exact definition of what constitutes the Karoo is available, so its extent is also not precisely defined. The Karoo is partly defined by its topography, Karoo Supergroup, geology and climate, and above all, its low rainfall, arid air, cloudless skies, and extremes of heat and cold. The Karoo also hosted a well-preserved ecosystem hundreds of millions of years ago which is now represented by many fossils. The Karoo formed an almost impenetrable barrier to the interior from Cape Town, and the early adventurers, explorers, hunters, and travelers on the way to the Highveld unanimously denounced it as a frightening place of great heat, great frosts, great floods, and great droughts. Today, it is still a place of great heat and frosts, and an annual rainfall of between 50 and 250 mm, though on some of the mountains i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
