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Channa Barca
The Barca snakehead (''Channa barca'') is a rare species of snakehead. It is endemic to the upper Brahmaputra River basin in northeastern India and Bangladesh. Records from Nepal are of doubtful validity. Overall it has been assessed as data deficient by the IUCN, and in 2014 it was assessed as critically endangered in Bangladesh by the IUCN. In Assam, it is locally known as ''cheng garaka'' or ''garaka cheng''. This is a relatively large snakehead, reaching a total length of up to . The species is regarded as an excellent food fish, and it is also highly desired by aquarists, but its rarity, behavior and large size makes it unsuitable for most aquariums.SeriouslyFishChanna barca Retrieved 14 February 2019. Distribution, habitat and behavior The barca snakehead is only known from the upper Brahmaputra River basin the Assam and Nagaland in India, and Sylhet in Bangladesh. Records from Nepal are of doubtful validity. It mostly inhabits wetlands, often near the margins, but can ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Francis Buchanan-Hamilton
Francis Buchanan (15 February 1762 – 15 June 1829), later known as Francis Hamilton but often referred to as Francis Buchanan-Hamilton, was a Scottish surgeon, surveyor and botanist who made significant contributions as a geographer and zoologist while living in India. He did not assume the name of Hamilton until three years after his retirement from India. The standard botanical author abbreviation Buch.-Ham. is applied to plants and animals he described, though today the form "Hamilton, 1822" is more usually seen in ichthyology and is preferred by Fishbase. Early life Francis Buchanan was born at Bardowie, Callander, Perthshire where Elizabeth, his mother, lived on the estate of Branziet; his father Thomas, a physician, came in Stirling, Spittal and claimed the chiefdom of the name of Clan Buchanan, Buchanan and owned the Leny estate. Francis Buchanan matriculated in 1774 and received an MA in 1779. As he had three older brothers, he had to earn a living from a profession, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Assam
Assam (, , ) is a state in Northeast India, northeastern India, south of the eastern Himalayas along the Brahmaputra Valley, Brahmaputra and Barak River valleys. Assam covers an area of . It is the second largest state in Northeast India, northeastern India by area and the largest in terms of population, with more than 31 million inhabitants. The state is bordered by Bhutan and Arunachal Pradesh to the north; Nagaland and Manipur to the east; Meghalaya, Tripura, Mizoram and Bangladesh to the south; and West Bengal to the west via the Siliguri Corridor, a strip of land that connects the state to the rest of India. Assamese language, Assamese and Bodo language, Bodo are two of the official languages for the entire state and Meitei language, Meitei (Manipuri language, Manipuri) is recognised as an additional official language in three districts of Barak Valley and Hojai district. in Hojai district and for the Barak valley region, alongside Bengali language, Bengali, which is also ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Channa
''Channa'' is a genus of predatory fish in the Family (biology), family Channidae, commonly known as snakeheads, native to freshwater habitats in Asia. This genus contains about 50 Binomial nomenclature, scientifically described species. The genus has a wide natural distribution extending from Iraq in the west, to Indonesia and China in the east, and parts of Siberia in the Far East. A particularly high Species richness, richness of species exists in Myanmar (Burma), Bangladesh and northeastern Northeast India, India, and many ''Channa'' species live nowhere else. In contrast, a few widespread species have been Introduced species, introduced to several regions outside their natural range, where they often become Invasive species, invasive. The large and medium-sized ''Channa'' species are among the most common staple food fish in several Asian countries, and they are extensively Fish farming, cultured. Apart from their importance as a food fish, snakeheads are consumed in some reg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fecundity
Fecundity is defined in two ways; in human demography, it is the potential for reproduction of a recorded population as opposed to a sole organism, while in population biology, it is considered similar to fertility, the capability to produce offspring, measured by the number of gametes (eggs), seed set, or asexual propagules. Human demography Human demography considers only human fecundity, at its culturally differing rates, while population biology studies all organisms. The term ''fecundity'' in population biology is often used to describe the rate of offspring production after one time step (often annual). In this sense, fecundity may include both birth rates and survival of young to that time step. While levels of fecundity vary geographically, it is generally a consistent feature of each culture. ''Fecundation'' is another term for fertilization. In obstetrics and gynecology, fecund-ability is the probability of being pregnant in a single menstrual cycle, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monsoon Of South Asia
The Monsoon of South Asia is among several geographically distributed global monsoons. It affects the Indian subcontinent, where it is one of the oldest and most anticipated weather phenomena and an economically important pattern every year from June through September, but it is only partly understood and notoriously difficult to predict. Several theories have been proposed to explain the origin, process, strength, variability, distribution, and general vagaries of the monsoon, but understanding and predictability are still evolving. The unique geographical features of the Indian subcontinent, along with associated atmospheric, oceanic, and geographical factors, influence the behavior of the monsoon. Because of its effect on agriculture, on flora and fauna, and on the climates of nations such as Bangladesh, Bhutan, India, Nepal, Pakistan, and Sri Lanka – among other economic, social, and environmental effects – the monsoon is one of the most anticipated, tracked, and studi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beel
A beel (Bengali language, Bengali and Assamese language, Assamese: বিল) is a billabong or a lake-like wetland with static water as opposed to moving water in rivers and canals - typically called in Bengali, in the Ganges - Brahmaputra Indo-Gangetic plain, flood plains of Bangladesh, and the Indian states of West Bengal and Assam. The term owes its origins to the word of the same pronunciation meaning "pond" and "lake" in the Bengali language, Bengali and Assamese language, Assamese languages. Formation Typically, beels are formed by inundation of low-lying lands during flooding, where some water gets trapped even after flood waters recede back from the flood plains. Beels may also be caused by filling up of low-lying areas during rains, especially during the monsoon season. There are different causes for the formation of beels. A string of beels is indicative of there being the remains of a great river that deserted its channel, moving to a new one elsewhere. Haor, Ba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mouthbrooder
Mouthbrooding, also known as oral incubation and buccal incubation, is the care given by some groups of animals to their offspring by holding them in the mouth of the parent for extended periods of time. Although mouthbrooding is performed by a variety of different animals, such as the Darwin's frog, fish are by far the most diverse mouthbrooders. Mouthbrooding has evolved independently in several different families of fish. Mouthbrooding behaviour Paternal mouthbrooders are species where the male looks after the eggs. Paternal mouthbrooders include the arowana, various mouthbrooding bettas and gouramies such as '' Betta pugnax'', and sea catfish such as '' Ariopsis felis''. Among cichlids, paternal mouthbrooding is relatively rare, but is found among some of the tilapiines, most notably the black-chin tilapia '' Sarotherodon melanotheron''. In the case of the maternal mouthbrooders, the female takes the eggs. Maternal mouthbrooders are found among both African and South American ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orange-spotted Snakehead
The orange-spotted snakehead (''Channa aurantimaculata'') is a species of snakehead fish. Its body is of brownish colour intermixed with vertical orange stripes. Males have taller dorsal fins with more intense coloration, and narrower heads. It is endemic to Brahmaputra River basin. Its type locality is Dibrugarh, the most northeastern area of Assam, India. Dibrughar is the same type locality as that of ''Channa bleheri''. This species grows to 16 in (40 cm). It is probably a mouthbrooder Mouthbrooding, also known as oral incubation and buccal incubation, is the care given by some groups of animals to their offspring by holding them in the mouth of the parent for extended periods of time. Although mouthbrooding is performed by a va ..., like most of the smaller snakeheads. One report is known from a German aquarist that a couple of his fish had bred. In the aquarium The orange-spotted snakehead is predatory, so it should not be housed with smaller fishes. It is comforta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hibernate
Hibernation is a state of minimal activity and metabolic reduction entered by some animal species. Hibernation is a seasonal heterothermy characterized by low body-temperature, slow breathing and heart-rate, and low metabolic rate. It is most commonly used to pass through winter months – called overwintering. Although traditionally reserved for "deep" hibernators such as rodents, the term has been redefined to include animals such as bears and is now applied based on active metabolic suppression rather than any absolute decline in body temperature. Many experts believe that the processes of daily torpor and hibernation form a continuum and use similar mechanisms. The equivalent during the summer months is aestivation. Hibernation functions to conserve energy when sufficient food is not available. To achieve this energy saving, an endothermic animal decreases its metabolic rate and thereby its body temperature. Hibernation may last days, weeks, or months—depending on the s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Water Table
The water table is the upper surface of the phreatic zone or zone of saturation. The zone of saturation is where the pores and fractures of the ground are saturated with groundwater, which may be fresh, saline, or brackish, depending on the locality. It can also be simply explained as the depth below which the ground is saturated. The portion above the water table is the vadose zone. It may be visualized as the "surface" of the subsurface materials that are saturated with groundwater in a given vicinity. In coarse soils, the water table settles at the surface where the water Hydraulic head, pressure head is equal to the atmospheric pressure (where gauge pressure = 0). In soils where capillary action is strong, the water table is pulled upward, forming a capillary fringe. The groundwater may be from precipitation or from more distant groundwater flowing into the aquifer. In areas with sufficient precipitation, water infiltrates through pore spaces in the soil, passing through t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sylhet Division
Sylhet Division () is a northeastern Divisions of Bangladesh, division of Bangladesh, renowned for its lush tea gardens, rolling hills and vibrant cultural heritage. Covering an area of approximately 12,298 square kilometres, it is bordered by the States and union territories of India, Indian states of Meghalaya, Assam and Tripura to the north, east and south respectively, while domestically it adjoins Chittagong Division, Chattogram to the southwest and Dhaka Division, Dhaka and Mymensingh Division, Mymensingh to the west. Prior to Partition of India, Partition in 1947, it included Karimganj district, Karimganj subdivision (presently in Barak Valley, Assam, India). However, Karimganj (including the thanas of Badarpur, Assam, Badarpur, Patharkandi and Ratabari Assembly constituency, Ratabari) was inexplicably severed from Sylhet by the Radcliffe Line, Radcliffe Boundary Commission. According to Niharranjan Ray, it was partly due to a plea from a delegation led by Abdul Matlib Ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nagaland
Nagaland () is a States and union territories of India, state in the northeast India, north-eastern region of India. It is bordered by the Indian states of Arunachal Pradesh to the north, Assam to the west, Manipur to the south, and the Naga Self-Administered Zone of the Sagaing Region of Myanmar, Myanmar (Burma) to the east. Its capital city is Kohima and its largest city is the twin Chümoukedima–Dimapur. The state has an area of with a population of 1,980,602 as per the 2011 Census of India, making it one of the least populated states in India.Census of India 2011 Govt of India Nagaland consists of 17 administrative districts, inhabited by 17 major tribes along with other sub-tribes. Each tribe is distinct in character from the other in terms of customs, language and dress. It is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
