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Golden Mandarin Fish
The golden mandarin fish (''Siniperca scherzeri''), also known as the leopard mandarin fish, is a species of freshwater ray-finned fish, an Asian perch from the family Sinipercidae, which is native to eastern Asia (Korea, China, and Vietnam). This species can reach at least in standard length and in weight. It is typically yellowish-brown with blackish-brown speckles ("leopard"), but there are also bright yellow ("golden") individuals, which are particularly prized in Korea and selectively bred in captivity. It is a commercially important fish, but has declined due to overfishing and habitat loss.Liu, L.; X.-F. Liang; and J. Fang (2017). The optimal stocking density for hybrid of Siniperca chuatsi (♀) × Siniperca scherzeri (♂) mandarin fish fed minced prey fish. Aquaculture Research 48(3): 1342–1345. It is farmed; typically using pure specimens, but sometimes involving hybrids with the faster-growing mandarin fish (''Siniperca chuatsi''). Danyang County Danyang County ... [...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] |
Overfishing
Overfishing is the removal of a species of fish (i.e. fishing) from a body of water at a rate greater than that the species can replenish its population naturally (i.e. the overexploitation of the fishery's existing fish stock), resulting in the species becoming increasingly underpopulated in that area. Overfishing can occur in water bodies of any sizes, such as ponds, wetlands, rivers, lakes or oceans, and can result in resource depletion, reduced biological growth rates and low biomass levels. Sustained overfishing can lead to critical depensation, where the fish population is no longer able to sustain itself. Some forms of overfishing, such as the overfishing of sharks, has led to the upset of entire marine ecosystems. Types of overfishing include: growth overfishing, recruitment overfishing, ecosystem overfishing. The ability of a fishery to recover from overfishing depends on whether its overall carrying capacity and the variety of ecological conditions are suitable for t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fish Of China
Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of living fish species are ray-finned fish, belonging to the class Actinopterygii, with around 99% of those being teleosts. The earliest organisms that can be classified as fish were soft-bodied chordates that first appeared during the Cambrian period. Although they lacked a true spine, they possessed notochords which allowed them to be more agile than their invertebrate counterparts. Fish would continue to evolve through the Paleozoic era, diversifying into a wide variety of forms. Many fish of the Paleozoic developed external armor that protected them from predators. The first fish with jaws appeared in the Silurian period, after which many (such as sharks) became formidable marine predators rather than just the prey of arthropods. Most f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fish Of Asia
Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of living fish species are ray-finned fish, belonging to the class Actinopterygii, with around 99% of those being teleosts. The earliest organisms that can be classified as fish were soft-bodied chordates that first appeared during the Cambrian period. Although they lacked a true spine, they possessed notochords which allowed them to be more agile than their invertebrate counterparts. Fish would continue to evolve through the Paleozoic era, diversifying into a wide variety of forms. Many fish of the Paleozoic developed external armor that protected them from predators. The first fish with jaws appeared in the Silurian period, after which many (such as sharks) became formidable marine predators rather than just the prey of arthropods. Most fis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siniperca
''Siniperca'' or the Chinese perch is a genus of temperate perches native to freshwater habitats in continental East Asia. Although its native ranges can extend to northern Vietnam, the majority of the species are entirely or largely restricted to China. Species The currently recognized species in this genus are: * ''Siniperca chuatsi'' ( Basilewsky, 1855) (mandarin fish) * '' Siniperca fortis'' ( S. Y. Lin, 1932) * '' Siniperca kneri'' Garman, 1912 (big-eye mandarin fish) * '' Siniperca liuzhouensis'' C. W. Zhou, X. Y. Kong & S. R. Zhu, 1987 * '' Siniperca loona'' H. W. Wu, 1939 Song, S., Zhao, J. & Li, C. (2017): Species delimitation and phylogenetic reconstruction of the sinipercids (Perciformes: Sinipercidae) based on target enrichment of thousands of nuclear coding sequences. ''Molecular Phylogenetics and Evolution, 111: 44-55.'' * '' Siniperca obscura'' Nichols, 1930 * '' Siniperca roulei'' H. W. Wu, 1930 * ''Siniperca scherzeri'' Steindachner Franz Steindachner (1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Danyang County
Danyang County (''Danyang-gun'') is in North Chungcheong Province, South Korea. Symbols *County tree: Yew tree *County bird: Magpie *County flower: Royal Azalea Geography The geographical terrain is 83.7% mountainous and 11.2% cultivable. It is very rugged, except in some of the urban areas and villages that can be found in the valleys and hills. The main water system ranges from the upper stream of the long Namhan River, which flows through the county. Pyeongchang River, one of the streams flowing from Odaesan, joins several streams at Jungnyeong, Danyang, and Geumgok, originating from Sobaeksan. Danyang Stream, which has its source in Hakseongsan, Gyeongsangbuk-do, joins the Namhan River at Habang-ri, Danseong-myeon, together with Jungnyeong Stream flowing from Jungnyeong and Dosolsan to Hyeoncholli, Danyang-eup, Maepo Stream from Geumsusan to Dodam, and Geumgok Stream from Biro Peak to Gosu-ri, Danyang-eup.Official page of Danyang county http://english.dy21.net/english/ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siniperca Chuatsi
''Siniperca chuatsi'', the mandarin fish (,), is a species of freshwater ray-finned fish from the family Sinipercidae, the Oriental perches. It is the type species of the genus ''Siniperca'' (Chinese perches). Description ''Siniperca chautsi'' has a body which is compressed with a protruding lower jaw and the maxilla reaching behind the eyes. The jaws are armed with rows of saw-like teeth. Lower jaw with 4–5 large sharp rays. There are two flat, sharp spines on the posterior margin of the operculum. It has small, round scales. It has a shiny brownish-yellow body marked with randomly situated coloured blotches and spots. They usually have black or dark grey stripes which run from their lips and run through the eyes over the lateral line but do not reach the back. It has a dorsal fin with the front part containing many hard spines with the rearmost having rounded tips. They have rounded pectoral, anal and caudal fins. There are three sharp spines situated in front of both pelvic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hybrid (biology)
In biology, a hybrid is the offspring resulting from combining the qualities of two organisms of different breeds, varieties, species or genera through sexual reproduction. Hybrids are not always intermediates between their parents (such as in blending inheritance), but can show hybrid vigor, sometimes growing larger or taller than either parent. The concept of a hybrid is interpreted differently in animal and plant breeding, where there is interest in the individual parentage. In genetics, attention is focused on the numbers of chromosomes. In taxonomy, a key question is how closely related the parent species are. Species are reproductively isolated by strong barriers to hybridisation, which include genetic and morphological differences, differing times of fertility, mating behaviors and cues, and physiological rejection of sperm cells or the developing embryo. Some act before fertilization and others after it. Similar barriers exist in plants, with differences in flowering tim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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. lotus). Aquaculture involves cultivating freshwater, brackish water and saltwater populations under controlled or semi-natural conditions, and can be contrasted with commercial fishing, which is the harvesting of wild fish. Mariculture, commonly known as marine farming, refers specifically to aquaculture practiced in seawater habitats and lagoons, opposed to in freshwater aquaculture. Pisciculture is a type of aquaculture that consists of fish farming to obtain fish products as food. Aquaculture can also be defined as the breeding, growing, and harvesting of fish and other aquatic plants, also known as farming in water. It is an environmental source of food and commercial product which help to improve healthier habitats and used to recon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Habitat Loss
Habitat destruction (also termed habitat loss and habitat reduction) is the process by which a natural habitat becomes incapable of supporting its native species. The organisms that previously inhabited the site are displaced or dead, thereby reducing biodiversity and species abundance. Habitat destruction is the leading cause of biodiversity loss. Fragmentation and loss of habitat have become one of the most important topics of research in ecology as they are major threats to the survival of endangered species. Activities such as harvesting natural resources, industrial production and urbanization are human contributions to habitat destruction. Pressure from agriculture is the principal human cause. Some others include mining, logging, trawling, and urban sprawl. Habitat destruction is currently considered the primary cause of species extinction worldwide. Environmental factors can contribute to habitat destruction more indirectly. Geological processes, climate change, introdu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Commercial Fishing
Commercial fishing is the activity of catching fish and other seafood for commercial profit, mostly from wild fisheries. It provides a large quantity of food to many countries around the world, but those who practice it as an industry must often pursue fish far into the ocean under adverse conditions. Large-scale commercial fishing is also known as industrial fishing. The major fishing industries are not only owned by major corporations but by small families as well. In order to adapt to declining fish populations and increased demand, many commercial fishing operations have reduced the sustainability of their harvest by fishing further down the food chain. This raises concern for fishery managers and researchers, who highlight how further they say that for those reasons, the sustainability of the marine ecosystems could be in danger of collapsing. Commercial fishermen harvest a wide variety of animals. However, a very small number of species support the majority of the world ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. However, only about 14% of these had been described by 2011. All species (except viruses) are given a two-part name, a "binomial". The first part of a binomial is the genus to which the species belongs. The second part is called the specific name or the specific epithet (in botanical nomenclature, also sometimes i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
