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Apistogramma Agassizii
''Apistogramma agassizii'', commonly known as Agassiz's dwarf cichlid, is a species of cichlid found in the Marañón and Ucayali River in Peru, some tributaries of the Amazon River, as well as downstream to the estuary in the Atlantic. It is named after the Swiss-American zoologist and geologist Louis Agassiz (1807-1873). Description ''Apistogramma agassiziii'' is a small, sexual dimorphic, and territorial fish. The males are larger, more colorful, and have more prolonged fins compared to females of the species. Body color and fin length are important characteristics during courtship and mating in the breeding seasons where larger males are more likely to control better quality territory and have more access to food. The larger and more colorful males are preferred by buyers of ornamental fish. Both males and females undergo four developmental phases of gonad maturation: immature, developing, spawning capable, and regressing. Mature females release a single batch of oocytes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Franz Steindachner
Franz Steindachner (11 November 1834 in Vienna – 10 December 1919 in Vienna) was an Austrian Zoology, zoologist, ichthyologist, and herpetologist. He published over 200 papers on fishes and over 50 papers on reptiles and amphibians. Steindachner described hundreds of new species of fish and dozens of new amphibians and reptiles. At least seven species of reptile have been named after him. Work and career Being interested in natural history, Steindachner took up the study of fossil fishes on the recommendation of his friend Eduard Suess (1831–1914). In 1860 he was appointed to the position of director of the fish collection at the Naturhistorisches Museum, a position which had remained vacant since the death of Johann Jakob Heckel (1790–1857). (in German). Steindachner's reputation as an Ichthyology, ichthyologist grew, and in 1868 he was invited by Louis Agassiz (1807–1873) to accept a position at the Museum of Comparative Zoology at Harvard University. Steindachner took ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apistogramma Bitaeniata
''Apistogramma'' is a large genus of freshwater fish in the family Cichlidae found in South America, but also commonly kept in aquariums. They are dwarf cichlids that mostly feed on tiny animals and have breeding behaviors that vary depending on the exact species. Range, conservation status and habitat ''Apistogramma'' are exclusively found in tropical and subtropical South America in the lowlands east of the Andes. The highest richness is in the western Amazon Basin and Orinoco Basin, but there are also species in the Guianan Shield, eastern Amazon Basin, rivers flowing into the Atlantic in northern Brazil (Tocantins– Araguaia to Parnaíba) and the Río de la Plata Basin.Kullander, S.O., and E.J.G. Ferreira (2005). Two new species of Apistogramma Regan (Teleostei: Cichlidae) from the rio Trombetas, Pará State, Brazil. Neotrop. ichthyol. 3(3). Although a few species are widespread, most members of this genus have small ranges.Tougard, C., C.R.G. Dávila, U. Römer, F. Dupo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apistogramma
''Apistogramma'' is a large genus of freshwater fish in the family Cichlidae found in South America, but also commonly kept in aquariums. They are dwarf cichlids that mostly feed on tiny animals and have breeding behaviors that vary depending on the exact species. Range, conservation status and habitat ''Apistogramma'' are exclusively found in tropical and subtropical South America in the lowlands east of the Andes. The highest richness is in the western Amazon Basin and Orinoco Basin, but there are also species in the Guianan Shield, eastern Amazon Basin, rivers flowing into the Atlantic in northern Brazil (Tocantins– Araguaia to Parnaíba) and the Río de la Plata Basin.Kullander, S.O., and E.J.G. Ferreira (2005). Two new species of Apistogramma Regan (Teleostei: Cichlidae) from the rio Trombetas, Pará State, Brazil. Neotrop. ichthyol. 3(3). Although a few species are widespread, most members of this genus have small ranges.Tougard, C., C.R.G. Dávila, U. Römer, F. Duponc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
David Alderton
David Alderton is an English writer specialising in pets and natural history topics. Growing up in a home surrounded by pets, he originally trained to become a veterinary surgeon. An allergic dermatitis acquired in his final year of study forced a change of career however, and so led him into the field of writing about pets and their care. He has since become a regular contributor of articles on this subject to a wide range of newspapers and magazines in the UK and abroad, and also participates frequently in radio and television programmes. As of 2010 his books have sold over five million copies, and have been translated into 30 different languages. Alderton's titles have won awards in the US from the Cat Writers' Association of America and the Maxwell Medallion from the Dog Writers' Association of America, as well as being nominated for the Sir Peter Kent Conservation Book Prize. He has also chaired the National Council for Aviculture, the umbrella organisation for bird-keeping c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Freshwater Aquarium Fish Species
A vast number of aquatic species have successfully adapted to live in the freshwater aquarium. This list gives some examples of the most common species found in home aquariums. Catfish Characins and other characiformes Cichlids Cyprinids Loaches and related cypriniformes Live-bearers and killifish Labyrinth fish Rainbowfish Gobies and sleepers Sunfish and relatives Other fish See also * List of aquarium fish by scientific name *List of brackish aquarium fish species *List of fish common names * List of freshwater aquarium amphibian species *List of freshwater aquarium invertebrate species *List of freshwater aquarium plant species * List of marine aquarium fish species * List of marine aquarium invertebrate species * The Aquarium Wiki Encyclopaedia List of Freshwater aquarium fish Sources * Encyclopedia of Aquarium and Pond Fish (2005) ( David Alderton) * 500 Aquari ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ichthyotoxin
Ichthyotoxins are compounds which are either toxic to fish, or are toxins produced by fish. The former include the algae-produced euglenophycin and prymnesins, which can cause large-scale fish deaths. The latter includes ostracitoxin, produced by boxfish. Many toxin-producing algal species can be found both in marine and fresh water environments when the algae are in bloom. Ichthyotoxic poisoning in humans can cause symptoms ranging in severity dependent on how much toxin was consumed. The symptoms of an ichthyotoxin poisoning from fish venoms can include headache, vomiting, diarrhea, dizziness, and drop in blood pressure. Examples The eggs of gar and the roe and eggs of several other fish species contain toxins. Toxin-producing algae include ''Prymnesium parvum''. Anti-cancer research Euglonophycin It was discovered that euglonophycin, a euglenoid ichthyotoxin derived from ''Euglena sanguinea'', displays anticancer activity. By sharing a similar chemical structure to so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barbasco can be synthesized.
{{Plant common name ...
Barbasco is the name of several plants that contain poisonous chemical compounds that have been used for fishing by indigenous populations of the Americas: * ''Lonchocarpus urucu'', used by Shuar and Nukak peoples as a poison for fishing. * ''Deguelia utilis'', used in Brazil and Peru as a poison for fishing. * '' Jacquinia barbasco'', an evergreen. * One of several inedible wild Mexican yam (''Dioscorea mexicana'' and ''Dioscorea composita'') from which progesterone Progesterone (P4) is an endogenous steroid and progestogen sex hormone involved in the menstrual cycle, pregnancy, and embryogenesis of humans and other species. It belongs to a group of steroid hormones called the progestogens and is the m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deforestation
Deforestation or forest clearance is the removal of a forest or stand of trees from land that is then converted to non-forest use. Deforestation can involve conversion of forest land to farms, ranches, or urban use. The most concentrated deforestation occurs in tropical rainforests. About 31% of Earth's land surface is covered by forests at present. This is one-third less than the forest cover before the expansion of agriculture, a half of that loss occurring in the last century. Between 15 million to 18 million hectares of forest, an area the size of Bangladesh, are destroyed every year. On average 2,400 trees are cut down each minute. The Food and Agriculture Organization of the United Nations defines deforestation as the conversion of forest to other land uses (regardless of whether it is human-induced). "Deforestation" and "forest area net change" are not the same: the latter is the sum of all forest losses (deforestation) and all forest gains (forest expansion) in a gi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nitrate
Nitrate is a polyatomic ion A polyatomic ion, also known as a molecular ion, is a covalent bonded set of two or more atoms, or of a metal complex, that can be considered to behave as a single unit and that has a net charge that is not zero. The term molecule may or may no ... with the chemical formula . salt (chemistry), Salts containing this ion are called nitrates. Nitrates are common components of fertilizers and explosives. Almost all inorganic nitrates are solubility, soluble in water. An example of an insoluble nitrate is bismuth oxynitrate. Structure The ion is the conjugate acid, conjugate base of nitric acid, consisting of one central nitrogen atom surrounded by three identically bonded oxygen atoms in a trigonal planar arrangement. The nitrate ion carries a formal charge of −1. This charge results from a combination formal charge in which each of the three oxygens carries a − charge, whereas the nitrogen carries a +1 charge, all these adding up to formal c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dwarf Cichlid
Dwarf cichlid is a term used by fishkeeping hobbyists to describe an arbitrary assemblage of small-sized fish from the family Cichlidae. Although the grouping is widely used in the aquarium industry and hobby, the grouping has no taxonomic or ecological basis and is poorly defined.Linke H, Staeck L (1994) ''American cichlids I: Dwarf Cichlids. A handbook for their identification, care and breeding.'' Tetra Press. Germany. Though dwarf cichlids are by definition small-sized cichlids, there is no accepted maximum length of a dwarf-sized cichlid. Some authors suggest a maximum of 10 centimetres (3.9 in.), while other suggest a maximum length of 12 centimetres (4.7 in.).Richter H-J (1989) ''Complete Book of Dwarf Cichlids.'' Tropical Fish Hobbyist, USA The term is most frequently used to describe small South American or West African species which are suitable for soft, acidic ( pH 4 to 7) densely planted aquariums, however, some aquarists and authors include within this "dwarf cichli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plio-Pleistocene
The Plio-Pleistocene is an informally described geological pseudo-period, which begins about 5 million years ago (Mya) and, drawing forward, combines the time ranges of the formally defined Pliocene and Pleistocene epochs—marking from about 5 Mya to about 12 kya. Nominally, the Holocene epoch—the last 12 thousand years—would be excluded, but most Earth scientists would probably treat the current times as incorporated into the term "Plio-Pleistocene"; see below. In the contexts of archaeology, paleontology, and paleoanthropology, the Plio-Pleistocene is a very useful period to which scientists may assign the long and continuous run in East Africa of datable sedimentary layers and their contents (e.g. the Bouri Formation). These contents collectively present a focused view of the continuous evolution of the region's large vertebrates, especially the evolution of some African apes (hominids) to the earliest hominins; and then the development of the early humans and thei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Most Recent Common Ancestor
In biology and genetic genealogy, the most recent common ancestor (MRCA), also known as the last common ancestor (LCA) or concestor, of a set of organisms is the most recent individual from which all the organisms of the set are descended. The term is also used in reference to the ancestry of groups of genes (haplotypes) rather than organisms. The MRCA of a set of individuals can sometimes be determined by referring to an established pedigree. However, in general, it is impossible to identify the exact MRCA of a large set of individuals, but an estimate of the time at which the MRCA lived can often be given. Such ''time to most recent common ancestor'' (''TMRCA'') estimates can be given based on DNA test results and established mutation rates as practiced in genetic genealogy, or by reference to a non-genetic, mathematical model or computer simulation. In organisms using sexual reproduction, the ''matrilineal MRCA'' and ''patrilineal MRCA'' are the MRCAs of a given population ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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