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Stenogobius Hawaiiensis
''Stenogobius hawaiiensis'', the Naniha goby, is a species of goby endemic to the Hawaiian Islands where it can be found in marine, brackish and fresh waters. This species is not as adept a climber as are many other Hawaiian gobies and thus is not found in the upper reaches of streams. This species can reach a length of SL. In the Hawaiian language, it is also known as O'opu naniha. It feeds on invertebrates such as worms, crustaceans and insects as well as algae. It is preyed upon by birds such as the black-crowned night-heron (''Nycticorax nycticorax'') as well as native fishes such as ''Caranx spp.'', ''Polydactylus sexfilis'' and ''Sphyraena barracuda''. Invasive alien fish such as mosquito fish and game species threaten the populations of ''S. hawaiiensis'' by bringing new diseases and parasites and by predating on their eggs and fry. They may also be threatened by alteration of their habitat by humans such as abstraction, pollution and damming but not to as great an ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ronald E
Ronald is a masculine given name derived from the Old Norse ''Rögnvaldr'', Hanks; Hardcastle; Hodges (2006) p. 234; Hanks; Hodges (2003) § Ronald. or possibly from Old English '' Regenweald''. In some cases ''Ronald'' is an Anglicised form of the Gaelic ''Raghnall'', a name likewise derived from ''Rögnvaldr''. The latter name is composed of the Old Norse elements ''regin'' ("advice", "decision") and ''valdr'' ("ruler"). ''Ronald'' was originally used in England and Scotland, where Scandinavian influences were once substantial, although now the name is common throughout the English-speaking world. A short form of ''Ronald'' is ''Ron''. Pet forms of ''Ronald'' include ''Roni'' and ''Ronnie''. ''Ronalda'' and ''Rhonda'' are feminine forms of ''Ronald''. '' Rhona'', a modern name apparently only dating back to the late nineteenth century, may have originated as a feminine form of ''Ronald''. Hanks; Hardcastle; Hodges (2006) pp. 230, 408; Hanks; Hodges (2003) § Rhona. The names ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polydactylus Sexfilis
''Polydactylus sexfilis'', the six-finger threadfin or yellowthread threadfin, is a species of marine ray-finned fish, a threadfin from the family Polynemidae which is found in the Indian and Pacific Oceans. Description ''Polydactylus sexfilis'' is a medium-sized species, which attains a maximum total length of and a weight of . It has a pointed snout and the head has an almost horizontal profile. There are two separated dorsal fins, the first dorsal fin has 8 spines and the second dorsal fin contains a single spine and 12 or 13 soft rays. The anal fin has 3 spines and 11 or 12 soft rays, the base of the anal fin is roughly equal in length to the second dorsal-fin base. The pectoral fin has 15 or 16 rays, and this fin has a length which is equal to 20 to 23% of the standard length, and its tip does not reach the tip of pelvic fin; almost all the rays of the pectoral fin are unbranched except that in the largest specimens some of the rays may be branched. There are six pectoral ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freshwater Fish Of Hawaii
Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the term specifically excludes seawater and brackish water, it does include non- salty mineral-rich waters such as chalybeate springs. Fresh water may encompass frozen and meltwater in ice sheets, ice caps, glaciers, snowfields and icebergs, natural precipitations such as rainfall, snowfall, hail/ sleet and graupel, and surface runoffs that form inland bodies of water such as wetlands, ponds, lakes, rivers, streams, as well as groundwater contained in aquifers, subterranean rivers and lakes. Fresh water is the water resource that is of the most and immediate use to humans. Water is critical to the survival of all living organisms. Many organisms can thrive on salt water, but the great majority of higher plants and most insects, amphibians, reptiles, mammals and birds need fresh water to survive. Fresh water is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stenogobius
''Stenogobius'' is a genus of fish in the goby subfamily, Gobionellinae. They are native to fresh, brackish and marine waters along the coasts of the Indian and Pacific Oceans. They are known commonly as coastal stream gobies. The genus is divided into two subgenera. Subgenus ''Stenogobius'' have varied coloration and scale arrangements, and ''Insularigobius'' species are strongly sexually dimorphic. Species There are currently 27 recognized species in this genus: * '' Stenogobius alleni'' Watson, 1991 * '' Stenogobius beauforti'' ( M. C. W. Weber, 1907) (Beaufort's goby) * '' Stenogobius blokzeyli'' (Bleeker, 1860) * '' Stenogobius caudimaculosus'' Watson, 1991 * '' Stenogobius fehlmanni'' Watson, 1991 * '' Stenogobius genivittatus'' (Valenciennes, 1837) (chinstripe goby) * '' Stenogobius gymnopomus'' (Bleeker, 1853) * '' Stenogobius hawaiiensis'' Watson, 1991 * '' Stenogobius hoesei'' Watson, 1991 * '' Stenogobius ingeri'' Watson, 1991 * '' Stenogobius keletaona'' Keith ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sexual Dimorphism
Sexual dimorphism is the condition where the sexes of the same animal and/or plant species exhibit different morphological characteristics, particularly characteristics not directly involved in reproduction. The condition occurs in most animals and some plants. Differences may include secondary sex characteristics, size, weight, colour, markings, or behavioural or cognitive traits. These differences may be subtle or exaggerated and may be subjected to sexual selection and natural selection. The opposite of dimorphism is ''monomorphism'', which is when both biological sexes are phenotypically indistinguishable from each other. Overview Ornamentation and coloration Common and easily identified types of dimorphism consist of ornamentation and coloration, though not always apparent. A difference in coloration of sexes within a given species is called sexual dichromatism, which is commonly seen in many species of birds and reptiles. Sexual selection leads to the exaggerated dim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mosquito Fish
The western Mosquitofish (''Gambusia affinis'') is a North American freshwater fish, also known commonly, if ambiguously, as simply Mosquitofish or by its generic name, ''Gambusia'', or by the common name gambezi. Its sister species, the eastern mosquitofish (''Gambusia holbrooki'') is also referred to by these names. Mosquitofish are small in comparison to many other freshwater fish, with females reaching a maximum length of and males a maximum length of . The female can be distinguished from the male by her larger size and a gravid spot at the posterior of her abdomen. The name "Mosquitofish" was given because the fish eats mosquito larvae, and has been used more than any other fishes for the biological control of mosquitoes. Gambusia typically eat zooplankton, beetles, mayflies, caddisflies, mites, and other invertebrates; mosquito larvae make up only a small portion of their diet. Mosquitofish were introduced directly into ecosystems in many parts of the world as a biocon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Invasive Species
An invasive species otherwise known as an alien is an introduced organism that becomes overpopulated and harms its new environment. Although most introduced species are neutral or beneficial with respect to other species, invasive species adversely affect habitats and bioregions, causing ecological, environmental, and/or economic damage. The term can also be used for native species that become harmful to their native environment after human alterations to its food webfor example the purple sea urchin (''Strongylocentrotus purpuratus'') which has decimated kelp forests along the northern California coast due to overharvesting of its natural predator, the California sea otter (''Enhydra lutris''). Since the 20th century, invasive species have become a serious economic, social, and environmental threat. Invasion of long-established ecosystems by organisms is a natural phenomenon, but human-facilitated introductions have greatly increased the rate, scale, and geographic range of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sphyraena Barracuda
''Sphyraena barracuda'', commonly known as the great barracuda, is a species of barracuda: large, predatory ray-finned fish found in subtropical oceans around the world. Distribution and habitat The great barracuda is present in tropical to warm temperate waters, in subtropical parts of the Indian, Pacific and Atlantic oceans, from mangrove areas to deep reef, with a lower depth limit of 110 meters. They are reported to be declining in Florida, and the Florida fish and wildlife conservation commission are considering imposing catch limits. Description Great barracudas are large fish, and one of the largest of the Barracudas. Mature specimens are usually around in length and weigh . Exceptionally large specimens can exceed and weigh over . The record-sized specimen caught on rod-and-reel weighed and measured , while an even longer example measured . The largest great barracuda was said to have measured . The Great barracuda is blue-gray above, fading to silvery and chalky-wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caranx
''Caranx'' is a genus of tropical to subtropical marine fishes in the jack family Carangidae, commonly known as jacks, trevallies and kingfishes. They are moderate- to large-sized, deep-bodied fishes which are distinguished from other carangid genera by specific gill raker, fin ray and dentition characteristics. The genus is represented in the Pacific, Indian and Atlantic Oceans, inhabiting both inshore and offshore regions, ranging from estuaries and bays to deep reefs and offshore islands. All species are powerful predators, taking a variety of fish, crustaceans and cephalopods, while they in turn are prey to larger pelagic fishes and sharks. A number of fish in the genus have a reputation as powerful gamefish and are highly sought by anglers. They often make up high amounts of the catch in various fisheries, but are generally considered poor to fair table fishes. Taxonomy and naming The genus ''Caranx'' is one of 30 currently recognised genera of fish in the jack and horse ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Goby
Goby is a common name for many species of small to medium sized ray-finned fish, normally with large heads and tapered bodies, which are found in marine, brackish and freshwater environments. Traditionally most of the species called gobies have been classified in the order Perciformes as the suborder Gobioidei but in the 5th Edition of ''Fishes of the World'' this suborder is elevated to an order Gobiiformes within the clade Percomorpha. Not all the species in the Gobiiformes are referred to as gobies and the "true gobies" are placed in the family Gobiidae, while other species referred to as gobies have been placed in the Oxudercidae. Goby is also used to describe some species which are not classified within the order Gobiiformes, such as the engineer goby or convict blenny ''Pholidichthys leucotaenia''. The word goby derives from the Latin ''gobius'' meaning "gudgeon", and some species of goby, especially the sleeper gobies in the family Eleotridae and some of the dartfishes are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Black-crowned Night-heron
The black-crowned night heron (''Nycticorax nycticorax''), or black-capped night heron, commonly shortened to just night heron in Eurasia, is a medium-sized heron found throughout a large part of the world, including parts of Europe, Asia, and North and South America. In Australasia it is replaced by the closely related nankeen night heron, with which it has hybridized in the area of contact. Taxonomy The black-crowned night heron was formally described by the Swedish naturalist Carl Linnaeus in 1758 in the tenth edition of his '' Systema Naturae''. He placed it with herons, cranes and egrets in the genus '' Ardea'' and coined the binomial name ''Ardea nicticorax''. It is now placed in the genus ''Nycticorax'' that was introduced in 1817 by the English naturalist Thomas Forster for this species. The epithet ''nycticorax'' is from Ancient Greek and combines ''nux'', ''nuktos'' meaning "night" and ''korax'' meaning "raven". The word was used by authors such as Aristotle and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crustacea
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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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