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Polynemid
Threadfins are silvery grey perciform fish of the family Polynemidae. Found in tropical to subtropical waters throughout the world, the threadfin family contains eight genera and about 40 species. An unrelated species sometimes known by the name threadfin, ''Alectis indicus'', is properly the Indian threadfish (family Carangidae). Ranging in length from in the dwarf threadfin (''Parapolynemus verekeri'') to in fourfinger threadfin (''Eleutheronema tetradactylum'') and giant African threadfin (''Polydactylus quadrifilis''), threadfins are both important to commercial fisheries as a food fish, and popular among anglers. Their habit of forming large schools makes the threadfins a reliable and economic catch. Description Their bodies are elongated and fusiform, with spinous and soft dorsal fins widely separated. Their tail fins are large and deeply forked, indicating speed and agility. The mouth is large and inferior; a blunt snout projects far ahead. The jaws and palate po ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dwarf Threadfin
The dwarf paradise fish (''Parapolynemus verekeri''), also known as the streamer threadfin or streamered tasselfish, is a species of ray-finned fish from a family Polynemidae, the threadfins. It is the only species in the genus ''Parapolynemus'' and it is found in Australia and New Guinea. Description The dwarf paradise fish is the smallest species of threadfin which has an elongated body with a large oblique and turned down mouth. It has two separate dorsal fins, the first of which has 8 spines and the second which has a single spine and 11-14 soft rayswhile the anal fin has 3 spines and 10 -12 soft rays. The base of the anal fin is shorter than that of the second dorsal fin. The caudal fin has long lobes with the lower usually being the longest; normally it is longer than the distance from the snout to the start of the second dorsal fin. The pectoral fins have 12 to 14 simple raysand are located near the midline of the body and may extend beyond the rear end of the anal fin's ba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fourfinger Threadfin
''Eleutheronema tetradactylum'', the fourfinger threadfin, is a species of marine ray-finned fish, a threadfin from the family Polynemidae which occurs in the Indian and western Pacific Ocean. Description ''Eleutheronema tetradactylum'' has two dorsal fins; the first has 9 spines and the second has 13–15 soft rays, with 13 being the mean. The anal fin has 3 spines and 14–19 soft rays. The pectoral fins have 16–18 rays, and there are 4 pectoral filaments. The upper sides of the head and body have a slight darkish silver tinge, lighting in the lower flanks. Both dorsal fins show a blackish anterior margin, with the remaining parts of the fins translucent and slightly dusky. The membranes of the pectoral fins are vivid yellow in smaller individuals, but in larger fish this becomes duskier. The pectoral filaments are white. The pelvic fins are white with a yellow front edge, while the caudal fin is blackish with a yellowish base. This species can attain a maximum total length of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pentanemus Quinquarius
The royal threadfin (''Pentanemus quinquarius'') is a species of ray-finned fish, a threadfin from the family Polynemidae, the threadfins. It is found in the eastern Atlantic Ocean along the western coast of Africa. Description The royal threadfin is a medium-sized threadfin species reaching a maximum total length of , although a more normal length is . It has two separate dorsal fins, the first dorsal fin has 8 spines and the second dorsal fin has a single spine and 14 or 15 soft rays. The anal fin contains 3 spines and 24 to 30 soft rays, with a base which is longer than that of the second dorsal-fin. The pectoral fin has 14 to 16 unbranched rays and is 30% to 42% of the fish's standard length with its tip extending to or just short of the centre of the base of the anal fin. The pectoral fin is situated far below the midline of body. There are 5 pectoral filaments, the first being the shortest and this filament just reaches to or extends beyond the start of the anal fin. The rem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atlantic Threadfin
The Atlantic threadfin (''Polydactylus octonemus'') is a species of ray-finned fish a threadfin from the family Polynemidae which is native to subtropical and temperate waters of the western Atlantic Ocean and the Gulf of Mexico. Description The Atlantic threadfin is a medium-sized species of threadfin which grows to a maximum total length of , although most fish have a total length of around . It has a pointed snout and an almost straight dorsal profile on its head. There are two separate dorsal fins, the first dorsal fin contains 8 spines in which the bases of each spine is a similar thickness to the others, and the second dorsal fin has a single spine and 11 to 13 soft rays. The anal fin has 3 spines and 12 to 14 soft rays, The base of the anal fin is longer than that of the second dorsal fin. The pectoral fin has 14 to 16 unbranched rays and has a length equivalent to 24%-29% of the standard length and its tip does not reach the tip of pelvic fin. There are 8 pectoral filament ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Giant African Threadfin
The giant African threadfin (''Polydactylus quadrifilis'') is a species of ray-finned fish from the threadfin family Polynemidae. It is found in the eastern Atlantic Ocean off the west coast of Africa. Description The giant African threadfin is, as its common name indicates, a large species of threadfin attaining a maximum total length of , although the more common size is . It has a pointed snout and analmost straight dorsal profile on the head. It has two separate dorsal fins, the first dorsal fin has 8 spines with the second of these being thicker than the rest, and the second dorsal fin contains a single spine and 13 soft rays. The anal fin has 3 spines and 11 soft rays, its base approximately equal in length to the base of the second dorsal fin. The pectoral fin has 12 or 13 unbranched rays and it measures 20 to 24% of the standard length of the fish, its tip not extended as far as the tip of pelvic fin. There are 4 pectoral filaments with the first being the shortest, the fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mullet (fish)
The mullets or grey mullets are a family (Mugilidae) of ray-finned fish found worldwide in coastal temperate and tropical waters, and some species in fresh water. Mullets have served as an important source of food in Mediterranean Europe since Roman times. The family includes about 78 species in 20 genera. Mullets are distinguished by the presence of two separate dorsal fins, small triangular mouths, and the absence of a lateral line organ. They feed on detritus, and most species have unusually muscular stomachs and a complex pharynx to help in digestion. Classification and naming Taxonomically, the family is currently treated as the sole member of the order Mugiliformes, but as Nelson says, "there has been much disagreement concerning the relationships" of this family. The presence of fin spines clearly indicates membership in the superorder Acanthopterygii, and in the 1960s, they were classed as primitive perciforms, while others have grouped them in Atheriniformes. They ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mugilidae
The mullets or grey mullets are a family (Mugilidae) of ray-finned fish found worldwide in coastal temperate and tropical waters, and some species in fresh water. Mullets have served as an important source of food in Mediterranean Europe since Roman times. The family includes about 78 species in 20 genera. Mullets are distinguished by the presence of two separate dorsal fins, small triangular mouths, and the absence of a lateral line organ. They feed on detritus, and most species have unusually muscular stomachs and a complex pharynx to help in digestion. Classification and naming Taxonomically, the family is currently treated as the sole member of the order Mugiliformes, but as Nelson says, "there has been much disagreement concerning the relationships" of this family. The presence of fin spines clearly indicates membership in the superorder Acanthopterygii, and in the 1960s, they were classed as primitive perciforms, while others have grouped them in Atheriniformes. They a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Milkfish
The milkfish (''Chanos chanos'') is the sole living species in the family Chanidae. However, there are at least five extinct genera from the Cretaceous. The repeating scientific name (tautonym) is from Greek ( ‘mouth’). The species has many common names. The Hawaiian name for the fish is ''awa'', and in Tahitian it is ''ava''. It is called ''bangús'' in the Philippines, where it is popularly known as the national fish, although the National Commission for Culture and the Arts has stated that this is not the case as it has no basis in Philippine law. In the Nauruan language, it is referred to as . Milkfish is also called ''bandeng'' or ''bolu'' in Indonesia. ''Chanos chanos'' occurs in the Indian Ocean and across the Pacific Ocean, from South Africa to Hawaii and the Marquesas, from California to the Galapagos, north to Japan, south to Australia. A single specimen was reported in 2012 in the eastern Mediterranean Sea. Milkfishes commonly live in tropical offshore marine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chanidae
Chanidae is a family of fishes which has a number of fossil genera and one monotypic extant genus which contains the milkfish (''Chanos chanos''). Taxonomy The family Chanidae is subdivided into two subfamilies, the Rubiesichthyinae, which comprises the extinct genera †'' Gordichthys'', †'' Nanaichthys'' and †'' Rubiesichthys'' from the early Cretaceous, and the Chaninae which comprises the sole extant genus '' Chanos'' and the extinct genera †'' Dastilbe'', †'' Parachanos'' and †''Tharrhias ''Tharrhias'' is an extinct genus of prehistoric bony fish that lived during the Aptian stage of the Early Cretaceous epoch. The type species ''T. araripis'' is named after the Araripe Basin, in which it was found in sediments of the Santana Fo ...'', also from the early Cretacaeous. References {{Taxonbar, from=Q12811045 Marine fish families Taxa named by Albert Günther Ray-finned fish families ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reef
A reef is a ridge or shoal of rock, coral or similar relatively stable material, lying beneath the surface of a natural body of water. Many reefs result from natural, abiotic processes— deposition of sand, wave erosion planing down rock outcrops, etc.—but there are also reefs such as the coral reefs of tropical waters formed by biotic processes dominated by corals and coralline algae, and artificial reefs such as shipwrecks and other anthropogenic underwater structures may occur intentionally or as the result of an accident, and sometimes have a designed role in enhancing the physical complexity of featureless sand bottoms, to attract a more diverse assemblage of organisms. Reefs are often quite near to the surface, but not all definitions require this. Earth's largest coral reef system is the Great Barrier Reef in Australia, at a length of over . Biotic There is a variety of biotic reef types, including oyster reefs and sponge reefs, but the most massive and widely ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sediment
Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles. For example, sand and silt can be carried in suspension in river water and on reaching the sea bed deposited by sedimentation; if buried, they may eventually become sandstone and siltstone (sedimentary rocks) through lithification. Sediments are most often transported by water (fluvial processes), but also wind (aeolian processes) and glaciers. Beach sands and river channel deposits are examples of fluvial transport and deposition, though sediment also often settles out of slow-moving or standing water in lakes and oceans. Desert sand dunes and loess are examples of aeolian transport and deposition. Glacial moraine deposits and till are ice-transported sediments. Classification Sediment can be classified based on its grain size, grain shape, and c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Euryhaline
Euryhaline organisms are able to adapt to a wide range of salinities. An example of a euryhaline fish is the molly (''Poecilia sphenops'') which can live in fresh water, brackish water, or salt water. The green crab (''Carcinus maenas'') is an example of a euryhaline invertebrate that can live in salt and brackish water. Euryhaline organisms are commonly found in habitats such as estuaries and tide pools where the salinity changes regularly. However, some organisms are euryhaline because their life cycle involves migration between freshwater and marine environments, as is the case with salmon and eels. The opposite of euryhaline organisms are stenohaline ones, which can only survive within a narrow range of salinities. Most freshwater organisms are stenohaline, and will die in seawater, and similarly most marine organisms are stenohaline, and cannot live in fresh water. Osmoregulation Osmoregulation is the active process by which an organism maintains its level of water cont ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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