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Oreochromis Lidole
''Oreochromis lidole'' is a species of freshwater fish in the family Cichlidae. This tilapia is native to Malawi, Mozambique and Tanzania, where it is found in Lake Malawi, Lake Malombe, the Shire River and perhaps some crater lakes further north. It is important in fisheries, but has drastically declined; it may already be extinct. This oreochromine cichlid is locally called ''chambo'', a name also used for two other closely related species found in the same region, ''O. karongae'' and ''O. squamipinnis''. Names The species was described as ''Tilapia lidole'' in 1941 by the British ichthyologist Ethelwynn Trewavas, from specimens she had collected on a fishery survey of Lake Malawi in 1939. She reported that the name was derived from the local name 'dole', although it was also known as ''galamula'' or ''lolo'', or more generally as ''chambo'' along with similar tilapia species. Along with other mouthbrooding tilapia species, it was reclassified in the genus ''Sarotherodon' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cape Maclear
Cape Maclear or Chembe is a town in the Mangochi District of Malawi's Southern Region. The town, on the Nankumba Peninsula, is on the southern shore of Lake Malawi and is the busiest resort on Lake Malawi. Cape Maclear is close to the islands of Domwe, Thumbwe and Mumbo Island on Lake Malawi, and is in Lake Malawi National Park. History In 1859, the missionary and explorer David Livingstone found the Cape, and named it "Cape Maclear" after his friend, the astronomer Thomas Maclear, who was Her Majesty's Astronomer at the Cape of Good Hope. In October 1875, a new mission, "Livingstonia", was set up by a group of members of the Free Church of Scotland. Before the missionaries arrived, the area was controlled by the Muslim Yao people. The graves of some of the missionaries are in Cape Maclear, overlooking the bay. Although Cape Maclear had a good harbour, the poor soil in the area, and the prevalence of the tsetse fly, meant a more suitable base had to be found; the mission ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sarotherodon
''Sarotherodon'' is a genus of oreochromine cichlids that are native to the northern half of Africa (south as far as the Congo River basin), with a single species, ''S. galilaeus'', also ranging into the Levant. A couple of species from this genus have been introduced far outside their native range, and are important in aquaculture (''S. galilaeus'' and to a lesser degree ''S. melanotheron''). Most other species have small ranges and some are seriously threatened. They mainly inhabit fresh and brackish water, but a few can live in salt water (at least for a period). Species in this genus, as well as those in several other oreochromine and tilapiine genera, share the common name "tilapia" and historically they were included in the genus ''Tilapia''. Based on mtDNA sequence analysis, there seem to be several clades in this genus, and a few species of the much larger genus ''Oreochromis'' (such as ''Oreochromis urolepis'' and the blue tilapia ''O. aureus'') seem closer to ''Saroth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aulacoseira
''Aulacoseira'' is a genus of diatoms belonging to the family Aulacoseiraceae Aulacoseirales is an order of diatoms belonging to the class Bacillariophyceae. The order consists only one family: Aulacoseiraceae. Genera Genera: * '' Alveolophora'' A.I.Moisseeva & T.L.Nevretdinova, 1990 * '' Aulacoseira'' G.H.K.Thwaites, 1 .... The genus has cosmopolitan distribution. Species: *'' Aulacoseira accincta'' *'' Aulacoseira acicularia'' *'' Aulacoseira aculeifera'' *'' Aulacoseira granulata'' References {{Taxonbar, from=Q771551 Diatoms Diatom genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diatom
A diatom (Neo-Latin ''diatoma''), "a cutting through, a severance", from el, διάτομος, diátomos, "cut in half, divided equally" from el, διατέμνω, diatémno, "to cut in twain". is any member of a large group comprising several genera of algae, specifically microalgae, found in the oceans, waterways and soils of the world. Living diatoms make up a significant portion of the Earth's biomass: they generate about 20 to 50 percent of the oxygen produced on the planet each year, take in over 6.7 billion metric tons of silicon each year from the waters in which they live, and constitute nearly half of the organic material found in the oceans. The shells of dead diatoms can reach as much as a half-mile (800 m) deep on the ocean floor, 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diaptomus
''Diaptomus'' is a genus of copepods with a single eye spot. It is superficially similar in size and appearance to ''Cyclops''. However it has characteristically very long first antennae that exceed the body length. In addition, the females carry the eggs in a single sac rather than the twin sacs seen in ''Cyclops''. It is a copepod of larger freshwater ponds, lakes and still waters. Species ''Diaptomus'' contains more than 60 species; many species formerly included in ''Diaptomus'' are now in separate genera such as ''Aglaodiaptomus'' and '' Notodiaptomus''. One species, the German endemic ''D. rostripes'', is included on the IUCN Red List as a Data Deficient species. *'' Diaptomus affinis'' Ulyanin, 1875 *'' Diaptomus africanus'' Daday, 1910 *'' Diaptomus alpestris'' (Vogt, 1845) *''Diaptomus angustaensis'' Turner, 1910 *'' Diaptomus armatus'' Herrick, 1882 *'' Diaptomus azureus'' Reid, 1985 *'' Diaptomus barabinensis'' Stepanova, 2008 *''Diaptomus bidens'' Brehm, 1924 *''Dia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bosmina
''Bosmina'' is a genus in the order Cladocera, the water fleas. Its members can be distinguished from those of '' Bosminopsis'' (the only other genus in the family Bosminidae) by the separation of the antennae; in ''Bosminopsis'', the antennae are fused at their bases. ''Bosmina'' are filter feeders consuming algae and protozoans about 1–3 μm long. ''Bosmina'' are known to have a dual feeding mechanism. They can filter the water using their second and third legs and the first leg will grab the particles. The second and third legs have small setules attached to the seta to make a mesh-like structure for filtering. Species list *'' Bosmina affinis'' *'' Bosmina arctica'' *'' Bosmina berolinensis'' *'' Bosmina bohemica'' *'' Bosmina brevirostris'' *'' Bosmina cederstroemi'' *''Bosmina chilensis'' *''Bosmina coregoni'' *'' Bosmina crassicornis'' *''Bosmina curvirostris'' *''Bosmina diaphana'' *''Bosmina fatalis'' *''Bosmina freyi'' *''Bosmina gibbera'' *''Bosmina globosa'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crustacean
Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapods, seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, amphipods and mantis shrimp. The crustacean group can be treated as a subphylum under the clade Mandibulata. It is now well accepted that the hexapods emerged deep in the Crustacean group, with the completed group referred to as Pancrustacea. Some crustaceans (Remipedia, Cephalocarida, Branchiopoda) are more closely related to insects and the other hexapods than they are to certain other crustaceans. The 67,000 described species range in size from '' Stygotantulus stocki'' at , to the Japanese spider crab with a leg span of up to and a mass of . Like other arthropods, crustaceans have an exoskeleton, which they moult to grow. They are distinguished from other groups of arthropods, such as insects, myriapods and chelicerates, by the possession of biramous (two-parted) limbs, and by th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plankton
Plankton are the diverse collection of organisms found in Hydrosphere, water (or atmosphere, air) that are unable to propel themselves against a Ocean current, current (or wind). The individual organisms constituting plankton are called plankters. In the ocean, they provide a crucial source of food to many small and large aquatic organisms, such as bivalves, fish and whales. Marine plankton include bacteria, archaea, algae, protozoa and drifting or floating animals that inhabit the saltwater of oceans and the brackish waters of estuaries. Freshwater plankton are similar to marine plankton, but are found in the freshwaters of lakes and rivers. Plankton are usually thought of as inhabiting water, but there are also airborne versions, the aeroplankton, that live part of their lives drifting in the atmosphere. These include plant spores, pollen and wind-scattered seeds, as well as microorganisms swept into the air from terrestrial dust storms and oceanic plankton swept into the air ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yolk
Among animals which produce eggs, the yolk (; also known as the vitellus) is the nutrient-bearing portion of the egg whose primary function is to supply food for the development of the embryo. Some types of egg contain no yolk, for example because they are laid in situations where the food supply is sufficient (such as in the body of the host of a parasitoid) or because the embryo develops in the parent's body, which supplies the food, usually through a placenta. Reproductive systems in which the mother's body supplies the embryo directly are said to be matrotrophic; those in which the embryo is supplied by yolk are said to be lecithotrophic. In many species, such as all birds, and most reptiles and insects, the yolk takes the form of a special storage organ constructed in the reproductive tract of the mother. In many other animals, especially very small species such as some fish and invertebrates, the yolk material is not in a special organ, but inside the egg cell. As sto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Operculum (fish)
The operculum is a series of bones found in bony fish and chimaeras that serves as a facial support structure and a protective covering for the gills; it is also used for respiration and feeding. Anatomy The opercular series contains four bone segments known as the preoperculum, suboperculum, interoperculum and operculum. The preoperculum is a crescent-shaped structure that has a series of ridges directed posterodorsally to the organisms canal pores. The preoperculum can be located through an exposed condyle that is present immediately under its ventral margin; it also borders the operculum, suboperculum, and interoperculum posteriorly. The suboperculum is rectangular in shape in most bony fishy and is located ventral to the preoperculum and operculum components. It is the thinnest bone segment out of the opercular series and is located directly above the gills. The interoperculum is triangular shaped and borders the suboperculum posterodorsally and the preoperculum anterodorsa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dorsal Fin
A dorsal fin is a fin located on the back of most marine and freshwater vertebrates within various taxa of the animal kingdom. Many species of animals possessing dorsal fins are not particularly closely related to each other, though through convergent evolution they have independently evolved external superficial fish-like body plans adapted to their marine environments, including most numerously fish, but also mammals such as cetaceans (whales, dolphins, and porpoises), and even extinct ancient marine reptiles such as various known species of ichthyosaurs. Most species have only one dorsal fin, but some have two or three. Wildlife biologists often use the distinctive nicks and wear patterns which develop on the dorsal fins of large cetaceans to identify individuals in the field. The bony or cartilaginous bones that support the base of the dorsal fin in fish are called ''pterygiophores''. Functions The main purpose of the dorsal fin is to stabilize the animal against rollin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Juvenile (organism)
A juvenile is an individual organism that has not yet reached its adult form, sexual maturity or size. Juveniles can look very different from the adult form, particularly in colour, and may not fill the same niche as the adult form. In many organisms the juvenile has a different name from the adult (see List of animal names). Some organisms reach sexual maturity in a short metamorphosis, such as eclosion in many insects. For others, the transition from juvenile to fully mature is a more prolonged process—puberty in humans and other species, for example. In such cases, juveniles during this transformation are sometimes called subadults. Many invertebrates, on reaching the adult stage, are fully mature and their development and growth stops. Their juveniles are larvae or nymphs. In vertebrates and some invertebrates (e.g. spiders), larval forms (e.g. tadpoles) are usually considered a development stage of their own, and "juvenile" refers to a post-larval stage that is not full ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
