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Wallagonia Leerii
''Wallagonia leerii'', also known as the Tapah and formerly the striped wallago catfish is a species of catfish native to Southeast Asia. Its habitat ranges from the river drainages of Thailand through the Malayan peninsula to the islands of Sumatra and Borneo in Indonesia. It can grow up to in length and weigh up to . It has been used as food in Southeast Asia since ancient times. Overfishing for its prized meat has caused the population to significantly decrease. Furthermore, the breeding migration pattern of this fish is especially vulnerable to damming, which has also decreased the wild population significantly. Until osteological research validated the genus '' Wallagonia'' in 2014, ''W. leerii'' was included in the genus ''Wallago''.Roberts, T.R. (2014): ''Wallago'' Bleeker, 1851 and ''Wallagonia'' Myers, 1938 (Ostariophysi, Siluridae), Distinct Genera of Tropical Asian Catfishes, with Description of †''Wallago maemohensis'' from the Miocene of Thailand. ''Bulletin of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Pieter Bleeker
Pieter Bleeker (10 July 1819 – 24 January 1878) was a Dutch medical doctor, Ichthyology, ichthyologist, and Herpetology, herpetologist. He was famous for the ''Atlas Ichthyologique des Indes Orientales Néêrlandaises'', his monumental work on the fishes of East Asia published between 1862 and 1877. Life and work Bleeker was born on 10 July 1819 in Zaandam. He was employed as a medical officer in the Royal Netherlands East Indies Army from 1842 to 1860, (in French). stationed in the Dutch East Indies (now Indonesia). During that time, he did most of his ichthyology work, besides his duties in the army. He acquired many of his specimens from local fishermen, but he also built up an extended network of contacts who would send him specimens from various government outposts throughout the islands. During his time in Indonesia, he collected well over 12,000 specimens, many of which currently reside at the Naturalis Biodiversity Center in Leiden. Bleeker corresponded with Auguste Dum� ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Mekong River
The Mekong or Mekong River ( , ) is a transboundary river in East Asia and Southeast Asia. It is the world's List of rivers by length, twelfth-longest river and List of longest rivers of Asia, the third-longest in Asia with an estimated length of and a drainage area of , discharging of water annually. From its headwaters in the Tibetan Plateau, the river runs through Southwest China (where it is officially called the Lancang River), Myanmar, Laos, Thailand, Cambodia, and southern Vietnam. The extreme seasonal variations in flow and the presence of Rapids, rapids and waterfalls in the Mekong make navigation difficult, though the river remains a major trade route between Tibet and Southeast Asia. The construction of hydroelectric dams along the Mekong in the 2000s through the 2020s has caused serious problems for the river's ecosystem, including the exacerbation of drought. Names The Mekong was originally called ''Mae Nam Khong'' from a contracted form of Kra-Dai language, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Siluridae
Siluridae is the nominate family (biology), family of catfishes in the order (biology), order Siluriformes. About 105 living species of silurids are placed in 12 or 14 genera. Although silurids occur across much of Europe and Asia, they are most diverse in Southeast Asia, beyond which their diversity decreases in temperate East Asia, the Indian subcontinent, Southwest Asia, and Europe. Silurids are apparently absent from much of central Asia. The family can be divided into two groups, a temperate North Eurasian clade and a more diverse subtropical/tropical South and Southeast Asian clade. Notable species *Wels catfish, ''Silurus glanis'' *Phantom catfish, ''Kryptopterus vitreolus'' *''Wallago attu'' *''Wallagonia leerii'' *Aristotle's catfish *Amur catfish *''Phalacronotus apogon'' *''Ompok'' Common features The family Siluridae is very diverse, with not very many distinctive features among all species, but some major ones include gigantism, and smaller versions of attributes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Grasslands
A grassland is an area where the vegetation is dominated by grasses (Poaceae). However, sedge ( Cyperaceae) and rush ( Juncaceae) can also be found along with variable proportions of legumes such as clover, and other herbs. Grasslands occur naturally on all continents except Antarctica and are found in most ecoregions of the Earth. Furthermore, grasslands are one of the largest biomes on Earth and dominate the landscape worldwide. There are different types of grasslands: natural grasslands, semi-natural grasslands, and agricultural grasslands. They cover 31–69% of the Earth's land area. Definitions Included among the variety of definitions for grasslands are: * "...any plant community, including harvested forages, in which grasses and/or legumes make up the dominant vegetation." * "...terrestrial ecosystems dominated by herbaceous and shrub vegetation, and maintained by fire, grazing, drought and/or freezing temperatures." (Pilot Assessment of Global Ecosystems, 2000) * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Maxilla
In vertebrates, the maxilla (: maxillae ) is the upper fixed (not fixed in Neopterygii) bone of the jaw formed from the fusion of two maxillary bones. In humans, the upper jaw includes the hard palate in the front of the mouth. The two maxillary bones are fused at the intermaxillary suture, forming the anterior nasal spine. This is similar to the mandible (lower jaw), which is also a fusion of two mandibular bones at the mandibular symphysis. The mandible is the movable part of the jaw. Anatomy Structure The maxilla is a paired bone - the two maxillae unite with each other at the intermaxillary suture. The maxilla consists of: * The body of the maxilla: pyramid-shaped; has an orbital, a nasal, an infratemporal, and a facial surface; contains the maxillary sinus. * Four processes: ** the zygomatic process ** the frontal process ** the alveolar process ** the palatine process It has three surfaces: * the anterior, posterior, medial Features of the maxilla include: * t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Caudal Fin
Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish swim. Apart from the tail or caudal fin, fish fins have no direct connection with the back bone and are supported only by muscles. Fish fins are distinctive anatomical features with varying structures among different clades: in ray-finned fish (Actinopterygii), fins are mainly composed of bony spines or rays covered by a thin stretch of scaleless skin; in lobe-finned fish (Sarcopterygii) such as coelacanths and lungfish, fins are short rays based around a muscular central bud supported by jointed bones; in cartilaginous fish (Chondrichthyes) and jawless fish (Agnatha), fins are fleshy " flippers" supported by a cartilaginous skeleton. Fins at different locations of the fish body serve different purposes, and are divided into two groups: the midsagittal ''unpaired fins'' and the more laterally located ''paired fins''. Unpaired fins are predominan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Mekong Giant Catfish
The Mekong giant catfish (''Pangasianodon gigas''; , , ; /''trəy riec''/; ), is a large, threatened species of catfish (order Siluriformes) in the shark catfish family (Pangasiidae), native to the Mekong basin in Southeast Asia and adjacent China. It is considered critically endangered due to overfishing and habitat loss. Description left, Depiction of a mature Mekong giant catfish from the ''Illustrated collection of fishes from Asia, Africa and Australia'' Grey to white in color and lacking stripes, the Mekong giant catfish is distinguished from other large catfish species in the river by the near-total lack of barbels and the absence of teeth. Young Mekong catfish do exhibit barbels and oral teeth, but these features diminish as they age and are absent by the time they grow to be 30–50 cm in length. Mekong giant catfish are one of the largest species of freshwater fish. In 2005, the Mekong giant catfish attained the ''Guinness World Record'' for the world's largest fre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Giant Pangasius
The giant pangasius, paroon shark, or Chao Phraya giant catfish (''Pangasius sanitwongsei'') is a species of large freshwater fish in the shark catfish family (Pangasiidae) of order Siluriformes, found in the Chao Phraya and Mekong basins in Indochina. Its populations have declined drastically, mainly due to overfishing, and it is now considered Critically Endangered. Etymology The specific name ''sanitwongsei'' was chosen by H.M. Smith to honor M. R. Suwaphan Sanitwong () for his support of fisheries in Thailand. Physical characteristics The giant pangasius is a typical member of the ''Pangasiidae'' commonly known as shark catfishes, which swim off the bottom unlike other catfish families. The species has a silver, curved underside and a dark brown back, possessing dusky melanophores that helps them camouflage. They have a wide, flat, whisker-less head. Its body is compressed and elongate, with a depressed head. It has a continuous and uninterrupted single vomero-palati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Silurus Glanis
The wels catfish ( or ; ''Silurus glanis''), also called sheatfish or just wels, is a large species of catfish native to wide areas of central, southern, and eastern Europe, in the basins of the Baltic Sea, Baltic, Black Sea, Black and Caspian Seas. It has been introduced to Western Europe as a prized sport fish and is now found from the United Kingdom east to Kazakhstan and China and south to Greece and Turkey. Etymology The English common name comes from wikt:Wels, Wels, the common name of the species in German language. ''Wels'' is a variation of Old High German ''wal'', from Proto-Germanic ''*hwalaz'' – the same source as for ''whale'' – from Proto-Indo-European ''*(s)kʷálos'' ('sheatfish'). Evolution The earliest known fossil remains of the wels catfish are from the late Miocene (about 5.3 million years ago) of Ukraine. Potentially slightly older but less well-preserved remains from 6-7 million years ago are also known from the same region. During this time period, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Wallagonia Leerii Illustration
''Wallagonia'' is a recently established genus of silurid catfishes, containing 3 distinct species, all of whom are native to Southeast Asia: *''Wallagonia leerii'' *''Wallagonia maculatus'' *''Wallagonia micropogon'' For the longest time, these species were included in the genus Wallago, only in 2014 the separate genus Wallagonia was finally established based on osteological features that clearly separate the two.Roberts, T.R. (2014): ''Wallago Bleeker, 1851 and Wallagonia Myers, 1938 (Ostariophysi, Siluridae), Distinct Genera of Tropical Asian Catfishes, with Description of †Wallago maemohensis from the Miocene of Thailand.'' Bulletin of the Peabody Museum of Natural History, 55 (1): 35-47. doi:10.3374/014.055.0103 While ''W. leerii'' is spread widely throughout Southeast Asia, ''W. micropogon'' and ''W. maculatus'' have a highly restricted habitat, with ''W. micropogon'' only occurring in the Mekong river basin and ''W. maculatus'' only occurring in the Kinabatangan river ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Subspecies
In Taxonomy (biology), biological classification, subspecies (: subspecies) is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (Morphology (biology), morphology), but that can successfully interbreed. Not all species have subspecies, but for those that do there must be at least two. Subspecies is abbreviated as subsp. or ssp. and the singular and plural forms are the same ("the subspecies is" or "the subspecies are"). In zoology, under the International Code of Zoological Nomenclature, the subspecies is the only taxonomic rank below that of species that can receive a name. In botany and mycology, under the International Code of Nomenclature for algae, fungi, and plants, other infraspecific name, infraspecific ranks, such as variety (botany), variety, may be named. In bacteriology and virology, under standard International Code of Nomenclature of Prokaryotes, bacterial nomenclature and virus clas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Kinabatangan River
The Kinabatangan River () is a river in Sandakan Division, in eastern Sabah, Malaysia. It is the second longest river in Malaysia, with a length of from its headwaters in the mountains of southwest Sabah to its outlet at the Sulu Sea, east of Sandakan. The area is known for its high biodiversity, including its limestone caves at Gomantong, Gomantong Hill, dipterocarp, dryland dipterocarp forests, riverine, riverine forest, swamp, freshwater swamp forest, oxbow lakes, and mangrove, salty mangrove swamps near the coast. Tributaries The main tributaries from the mouth: Etymology and history With the early Chinese traders' settlement around the river mouth area, the name ''Kina Batañgan'' was used by the indigenous people of the area for the river, with the word ''Kina'' being a reference by the indigenous Dusun people, Dusun for the Malaysian Chinese, Chinese people. The Orang Sungai traditionally lived along the river banks and were of mixed ancestry, including Dusun, Tausūg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
