Portal:Fish

The Fish Portal

A fish (pl.: fish or fishes) is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits. Fish can be grouped into the more basal jawless fish and the more common jawed fish, the latter including all living cartilaginous and bony fish, as well as the extinct placoderms and acanthodians. In a break to the long tradition of grouping all fish into a single class (Pisces), modern phylogenetics views fish as a paraphyletic group.

The earliest fish appeared during the Cambrian as small filter feeders; they continued to evolve through the Paleozoic, diversifying into many forms. The earliest fish with dedicated respiratory gills and paired fins, the ostracoderms, had heavy bony plates that served as protective exoskeletons against invertebrate predators. The first fish with jaws, the placoderms, appeared in the Silurian and greatly diversified during the Devonian, the "Age of Fishes".

Bony fish, distinguished by the presence of swim bladders and later ossified endoskeletons, emerged as the dominant group of fish after the end-Devonian extinction wiped out the apex predators, the placoderms. Bony fish are further divided into the lobe-finned and ray-finned fish. About 96% of all living fish species today are teleosts, a crown group of ray-finned fish that can protrude their jaws. The tetrapods, a mostly terrestrial clade of vertebrates that have dominated the top trophic levels in both aquatic and terrestrial ecosystems since the Late Paleozoic, evolved from lobe-finned fish during the Carboniferous, developing air-breathing lungs homologous to swim bladders. Despite the cladistic lineage, tetrapods are usually not considered to be fish. (Full article...)

Selected article –


  • The bluntnose stingray or Say's stingray (Hypanus say, often misspelled sayi) is a species of stingray in the family Dasyatidae, native to the coastal waters of the western Atlantic Ocean from the U.S. state of Massachusetts to Venezuela. It is a bottom-dwelling species that prefers sandy or muddy habitats 1–10 m (3.3–32.8 ft) deep, and is migratory in the northern portion of its range. Typically growing to 78 cm (31 in) across, the bluntnose stingray is characterized by a rhomboid pectoral fin disc with broadly rounded outer corners and an obtuse-angled snout. It has a whip-like tail with both an upper keel and a lower fin fold, and a line of small tubercles along the middle of its back.

    More active at night than during the day when it is usually buried in sediment, the bluntnose stingray is a predator of small benthic invertebrates and bony fishes. This species is aplacental viviparous, in which the unborn young are nourished initially by yolk, and later histotroph ("uterine milk") produced by their mother. Females give birth to 1–6 pups every May after a gestation period of 11–12 months, most of which consists of a period of arrested embryonic development. The venomous tail spine of the bluntnose stingray is potentially dangerous to unwary beachgoers. The International Union for Conservation of Nature (IUCN) has listed this species as near threatened. (Full article...)

  • The sparsely spotted stingaree (Urolophus paucimaculatus), also known as the white-spotted stingaree or Dixon's stingaree, is a species of stingray in the family Urolophidae, common off the southern Australian coast. Preferring sandy flats and seagrass beds, this benthic ray can be found from close to shore to a depth of at least 150 m (490 ft), and tends to occur deeper in the northern portion of its range. Reaching a length of 57 cm (22 in), this species has a broad, diamond-shaped pectoral fin disc that is typically plain gray in color above with a V-shaped marking between the eyes. Individuals from southerly waters also generally exhibit a smattering of small, dark-edged white spots. This ray is further characterized by a distinctively bell-shaped curtain of skin between the nostrils. Its tail has a skin fold running along either side and a leaf-shaped caudal fin, but no dorsal fin.

    Relatively inactive during daytime, the sparsely spotted stingaree preys mainly on crustaceans, and to a much lesser extent on polychaete worms and other small benthic organisms. It is aplacental viviparous, with the mother provisioning her young with histotroph ("uterine milk"). Life history differs between the eastern and western subpopulations: eastern females bear litters of up to six pups with a twelve-month gestation period, while western females bear litters of only one or two pups with a ten-month gestation period. Also, western rays mature later and live longer than eastern rays. The venomous sting of the sparsely spotted stingaree is potentially injurious to humans, and it has been reported to react aggressively if disturbed. The International Union for Conservation of Nature (IUCN) has listed it under Least Concern, as there is little fishing activity over the majority of its range. (Full article...)

  • Title-page of the first edition. It describes the author as VPZS (Vice-President of the Zoological Society) and an FLS (Fellow of the Linnean Society).

    A History of British Fishes is a natural history book by William Yarrell, serialised in nineteen parts from 1835, and then published bound in two volumes in 1836. It is a handbook or field guide systematically describing every type of fish found in the British Isles, with an article for each species.

    Yarrell was a London bookseller and newsagent with the time and income to indulge his interest in natural history. He was a prominent member of several natural history societies and knew most of the leading British naturalists of his day. He was able to draw on his own extensive library and collection of specimens, his wide network of like-minded naturalist friends, and his access to major libraries to garner material for his writings, the most important of which were A History of British Fishes and the 1843 A History of British Birds. (Full article...)

  • The round ribbontail ray or blotched fantail ray, (Taeniurops meyeni) is a species of stingray in the family Dasyatidae, found throughout the nearshore waters of the tropical Indo-Pacific, as well as off islands in the eastern Pacific. It is a bottom-dwelling inhabitant of lagoons, estuaries, and reefs, generally at a depth of 20–60 m (66–197 ft). Reaching 1.8 m (5.9 ft) across, this large ray is characterized by a thick, rounded pectoral fin disc covered by small tubercles on top, and a relatively short tail bearing a deep ventral fin fold. In addition, it has a variable but distinctive light and dark mottled pattern on its upper surface, and a black tail.

    Generally nocturnal, the round ribbontail ray can be solitary or gregarious, and is an active predator of small, benthic molluscs, crustaceans, and bony fishes. It is aplacental viviparous, with the embryos sustained by yolk, and later histotroph ("uterine milk") secreted by the mother; up to seven pups are born at a time. Although not aggressive, if provoked the round ribbontail ray will defend itself with its venomous tail spine, and it has been responsible for at least one fatality. It is valued by ecotourist divers and recreational anglers. This slow-reproducing species is threatened by commercial fishing, both targeted and bycatch, and habitat degradation across much of its range. As a result, the International Union for Conservation of Nature (IUCN) has assessed it as Vulnerable. (Full article...)

  • The cookiecutter shark (Isistius brasiliensis), also called the cigar shark, is a species of small squaliform shark in the family Dalatiidae. This shark lives in warm, oceanic waters worldwide, particularly near islands, and has been recorded as deep as 3.7 km (2.3 mi). It migrates vertically up to 3 km (1.9 mi) every day, approaching the surface at dusk and descending with the dawn. Reaching only 42–56 cm (16.5–22 in) in length, the cookiecutter shark has a long, cylindrical body with a short, blunt snout, large eyes, two tiny spineless dorsal fins, and a large caudal fin. It is dark brown, with light-emitting photophores covering its underside except for a dark "collar" around its throat and gill slits.

    The name "cookiecutter shark" refers to its feeding method of gouging round plugs, as if cut out with a cookie cutter, out of larger animals. Marks made by cookiecutter sharks have been found on a wide variety of marine mammals and fishes, and on submarines, undersea cables, and human bodies. It also consumes whole smaller prey, such as squid. Cookiecutter sharks have adaptations for hovering in the water column, and likely rely on stealth and subterfuge to capture more active prey. Its dark collar seems to mimic the silhouette of a small fish, while the rest of its body blends into the downwelling light via its ventral photophores. When a would-be predator approaches the lure, the shark attaches itself using its suctorial lips and specialized pharynx and neatly excises a chunk of the flesh using its bandsaw-like set of lower teeth. This species has been known to travel in schools. (Full article...)

  • Kuhl's maskray (Neotrygon kuhlii), also known as the blue-spotted stingray, blue-spotted maskray, or Kuhl's stingray, is a species of stingray of the family Dasyatidae. It was recently changed from Dasyatis kuhlii in 2008 after morphological and molecular analyses showed that it is part of a distinct genus, Neotrygon. The body is rhomboidal and colored green with blue spots. Maximum disk width is estimated 46.5 cm (18.3 in). It is popular in aquaria, but usually not distinguished from the blue-spotted ribbontail ray. The ribbontail has a rounded body, is a brighter green with brighter blue and more vivid spots, but Kuhl's maskray is larger. The stingray's lifespan is estimated at 13 years for females and 10 years for males. The blue-spotted stingray preys on many fish and small mollusks. It is also generally found from Indonesia to Japan, and most of Australia. Kuhl's maskray also is targeted by many parasites, such as tapeworms, flatworms, and flukes. (Full article...)

  • Skeletal reconstruction of Ornithoprion, with known material represented in white and implied/suggested material represented in gray

    Ornithoprion is an extinct genus of cartilaginous fish. The only species, O. hertwigi, lived during the Moscovian stage of the Pennsylvanian, between 315.2 and 307 million years ago, and is preserved in black shales from what is now the Midwestern United States. The study of Ornithoprion was performed primarily via x-ray imaging, and at the time of its discovery it represented one of the best known Paleozoic holocephalans. The classification of the genus has been the subject of debate due to its unique anatomy, but it is now placed in the order Eugeneodontiformes and the family Caseodontidae. Ornithoprion's genus name, which may be translated as 'bird saw', was inspired by the animal's vaguely bird-like skull and the saw-like appearance of the teeth in the lower jaw, while the species name honors Oscar Hertwig.

    Ornithoprion is unique among known eugeneodonts for the extremely long mandibular rostrum extending from the lower jaw, which was protected by a beak of fused bony scales and which the function of in life is not known. It inhabited shallow marine environments and coexisted with a variety of other cartilaginous fishes. The structure of Ornithoprion's teeth suggests that it was a durophage which hunted shelled marine invertebrates, and bite marks and damage to its fossils indicate it was fed on by other carnivores. Ornithoprion was small relative to other members of its order, with a cranium length of up to 10 centimetres (3.9 in) and an estimated body length of up to approximately 91 centimetres (36 in). (Full article...)

  • The porbeagle or porbeagle shark (Lamna nasus) is a species of mackerel shark in the family Lamnidae, distributed widely in the cold and temperate marine waters of the North Atlantic and Southern Hemisphere. In the North Pacific, its ecological equivalent is the closely related salmon shark (L. ditropis). It typically reaches 2.5 m (8.2 ft) in length and a weight of 135 kg (298 lb); North Atlantic sharks grow larger than Southern Hemisphere sharks and differ in coloration and aspects of life history. Gray above and white below, the porbeagle has a very stout midsection that tapers towards the long, pointed snout and the narrow base of the tail. It has large pectoral and first dorsal fins, tiny pelvic, second dorsal, and anal fins, and a crescent-shaped caudal fin. The most distinctive features of this species are its three-cusped teeth, the white blotch at the aft base of its first dorsal fin, and the two pairs of lateral keels on its tail.

    The porbeagle is an opportunistic hunter that preys mainly on bony fishes and cephalopods throughout the water column, including the bottom. Most commonly found over food-rich banks on the outer continental shelf, it makes occasional forays both close to shore and into the open ocean to a depth of 1,360 m (4,460 ft). It also conducts long-distance seasonal migrations, generally shifting between shallower and deeper water. The porbeagle is fast and highly active, with physiological adaptations that enable it to maintain a higher body temperature than the surrounding water. It can be solitary or gregarious, and has been known to perform seemingly playful behavior. This shark is aplacental viviparous with oophagy, developing embryos being retained within the mother's uterus and subsisting on non-viable eggs. Females typically bear four pups every year. (Full article...)

  • The blotchy swellshark or Japanese swellshark (Cephaloscyllium umbratile) is a common species of catshark, belonging to the family Scyliorhinidae. The Blotchy swellshark is found at depths of 90–200 m (300–660 ft) in the northwestern Pacific Ocean, from Japan to Taiwan. It is benthic in nature and favors rocky reefs. Reaching 1.4 m (4.6 ft) in length, this thick-bodied shark has a broad head, large mouth, and two unequally-sized dorsal fins positioned far back past the pelvic fins. It can be identified by its dorsal coloration, consisting of seven brown "saddles" and extensive darker mottling on a light tan background. This species has often been confounded with the draughtsboard shark (C. isabellum) and the Sarawak pygmy swellshark (C. sarawakensis) in scientific literature.

    Voracious and opportunistic in feeding habits, the blotchy swellshark is known to consume numerous types of fishes and invertebrates, including an unusually high diversity of cartilaginous fishes. Like other Cephaloscyllium species, it is capable of rapidly inflating its body as a defense against predators. This species is oviparous, with females laying encapsulated eggs two at a time. There is no well-defined breeding season and reproduction occurs year-round. The eggs hatch after approximately one year. The blotchy swellshark is harmless and fares well in captivity. It is caught as bycatch in commercial bottom trawls, though its population does not seem to have suffered from fishing activity. (Full article...)

  • The black bream (Acanthopagrus butcheri), also commonly known as the southern black bream, southern bream and blue-nosed bream, is a species of anadromous ray-finned fish of the porgy family Sparidae. A deep-bodied fish, it is occasionally confused with other similar species that occur within its range, but is generally distinguished from these species by a lack of yellow ventral and anal fins. Southern black bream are endemic to the southern coasts of Australia from Shark Bay in Western Australia to Ulladulla, New South Wales, as well as Tasmania.

    The black bream is primarily an inhabitant of brackish waters of estuaries and coastal lakes, rarely entering the open ocean, as it cannot complete its life cycle in a fully marine environment. During the breeding season, the species is known to penetrate into the upper reaches of rivers to spawn, causing an influx of juveniles in the estuaries a few months later. It is an opportunistic predator, consuming a wide range of crustaceans, molluscs, polychaetes and forage fish. (Full article...)

  • American paddlefish, Polyodon spathula

    Paddlefish (family Polyodontidae) are a family of ray-finned fish belonging to order Acipenseriformes, and one of two living groups of the order alongside sturgeons (Acipenseridae). They are distinguished from other fish by their elongated rostra, which are thought to enhance electroreception to detect prey. Paddlefish have been referred to as "primitive fish" because the Acipenseriformes are among the earliest diverging lineages of ray-finned fish, having diverged from all other living groups over 300 million years ago. Both living and fossil paddlefish are found almost exclusively in North America and China.

    Eight species are known: Six of those species are extinct, and known only from fossils (five from North America, one from China), one of the extant species, the American paddlefish (Polyodon spathula), is native to the Mississippi River basin in the U.S. The other is the Chinese paddlefish (Psephurus gladius), which was declared extinct in 2022 following a 2019 recommendation; the species has not been sighted in the Yangtze River Basin in China since 2003. Chinese paddlefish are also commonly referred to as "Chinese swordfish", or "elephant fish". The earliest known paddlefish is Protopsephurus, from the early Cretaceous (Aptian) of China, dating to around 120 million years ago. (Full article...)

  • The banded archerfish (Toxotes jaculatrix) is a brackish water perciform fish of the archerfish genus Toxotes. It is silvery in colour and has a dorsal fin towards the posterior end. It has distinctive, semi-triangular markings along its sides. It is best known for its ability to spit a jet of water to "shoot down" prey. Larger specimens may be able to hit prey 2 to 3 metres (6 ft 7 in to 9 ft 10 in) away. The banded archerfish may reach the displaced prey within 50 milliseconds of its hitting the water.

    The name (binomial as well as common) refers to Sagittarius the archer, because of the unusual method banded archerfish use to capture prey. Banded archerfish are found in Indo-Pacific and Oceanian waters, generally in river mouths and mangrove estuaries. They move between fresh, salt, and brackish water over the course of their lifetime, though not to breed. Because of their markings and silvery colour, banded archerfish are sometimes kept as aquarium fish, though they are difficult to care for and not recommended for most home aquaria. (Full article...)

  • The smalltail shark (Carcharhinus porosus) is a species of requiem shark, and part of the family Carcharhinidae. It is found in the western Atlantic Ocean, from the northern Gulf of Mexico to southern Brazil. It inhabits shallow waters close to shore, particularly over muddy bottoms around estuaries. It tends to swim low in the water column and forms large aggregations segregated by sex. A slim species generally not exceeding 1.1 m (3.6 ft) in length, the smalltail shark has a rather long, pointed snout, a broad, triangular first dorsal fin, and a second dorsal fin that originates over the midpoint of the anal fin base. It is plain gray in color, without prominent markings on its fins.

    The diet of the smalltail shark consists mainly of bony fishes such as croakers, while crustaceans, cephalopods, and smaller sharks and rays may also be consumed. It is viviparous, meaning the developing embryos are sustained by a placental connection. Females bear litters of two to 9 young on a biennial cycle, following a roughly 12-month gestation period. The smalltail shark is often caught as bycatch and may be used for meat, fins, liver oil, cartilage, and fishmeal. It seems to have declined significantly since the 1980s. Therefore, the International Union for Conservation of Nature has listed it as critically endangered. (Full article...)

  • The spinner shark (Carcharhinus brevipinna) is a type of requiem shark, in the family Carcharhinidae, named for the spinning leaps it makes as a part of its feeding strategy. This species occurs in tropical and warm temperate waters worldwide, except for in the eastern Pacific Ocean. It is found from coastal to offshore habitats to a depth of 100 m (330 ft), though it prefers shallow water. The spinner shark resembles a larger version of the blacktip shark (C. limbatus), with a slender body, long snout, and black-marked fins. This species can be distinguished from the blacktip shark by the first dorsal fin, which has a different shape and is placed further back, and by the black tip on the anal fin (in adults only). It attains a maximum length of 3 m (9.8 ft).

    Spinner sharks are swift and gregarious predators that feed on a wide variety of small bony fishes and cephalopods. When feeding on schools of forage fish, they speed vertically through the school while spinning on their axis, erupting from the water at the end. Like other members of its family, the spinner shark is viviparous, with females bearing litters of three to 20 young every other year. The young are born in shallow nursery areas near the coast, and are relatively fast-growing. This species is not usually dangerous to humans, but may become belligerent when excited by food. Spinner sharks are valued by commercial fisheries across their range for their meat, fins, liver oil, and skin. They are also esteemed as strong fighters by recreational fishers. The International Union for Conservation of Nature has assessed this species as Vulnerable worldwide. (Full article...)

  • The grey reef shark or gray reef shark (Carcharhinus amblyrhynchos, sometimes misspelled amblyrhynchus or amblyrhinchos) is a species of requiem shark, in the family Carcharhinidae. One of the most common reef sharks in the Indo-Pacific, it is found as far east as Easter Island and as far west as South Africa. This species is most often seen in shallow water near the drop-offs of coral reefs. It has the typical "reef shark" shape, with a broad, round snout and large eyes. It can be distinguished from similar species by the plain or white-tipped first dorsal fin, the dark tips on the other fins, the broad, black rear margin on the tail fin, and the lack of a ridge between the dorsal fins. Most individuals are less than 1.88 m (6.2 ft) long.

    The grey reef shark is a fast-swimming, agile predator that feeds primarily on free-swimming bony fishes and cephalopods. Its aggressive demeanor enables it to dominate many other shark species on the reef, despite its moderate size. Many grey reef sharks have a home range on a specific area of the reef, to which they continually return. However, they are social rather than territorial. During the day, these sharks often form groups of five to 20 individuals near coral reef drop-offs, splitting up in the evening as the sharks begin to hunt. Adult females also form groups in very shallow water, where the higher water temperature may accelerate their growth or that of their unborn young. Like other members of its family, the grey reef shark is viviparous, meaning the mother nourishes her embryos through a placental connection. Litters of one to six pups are born every other year. (Full article...)

Selected fish –

The common stingray (Dasyatis pastinaca) is a species of stingray in the family Dasyatidae, found in the northeastern Atlantic Ocean and the Mediterranean and Black Seas. It typically inhabits sandy or muddy habitats in coastal waters shallower than 60 m (200 ft), often burying itself in sediment. Usually measuring 45 cm (18 in) across, the common stingray has a diamond-shaped pectoral fin disc slightly wider than long, and a whip-like tail with upper and lower fin folds. It can be identified by its plain coloration and mostly smooth skin, except for a row of tubercles along the midline of the back in the largest individuals.

The predominant prey of the common stingray are bottom-dwelling crustaceans, though it also takes molluscs, polychaete worms, and small bony fishes. It is aplacental viviparous: the embryos are nourished by yolk and later histotroph ("uterine milk") produced by the mother. Females bear 4–9 young twice per year in shallow water, after a gestation period of four months. The common stingray can inflict a painful, though rarely life-threatening, wound with its venomous tail spine. During classical antiquity, its sting was ascribed many mythical properties. This species is not sought after by commercial fisheries, but is taken in large numbers as bycatch and utilized for food, fishmeal, and liver oil. Its population is apparently dwindling across its range, and the International Union for Conservation of Nature (IUCN) assesses it as Vulnerable. (Full article...)

Did you know (auto-generated) -

  • ... that the historical lands and fishing grounds of the Skinpah were buried underwater by the construction of The Dalles Dam?
  • ... that David Fishwick went from a £27.50-a-week pebbledashing job to becoming the biggest minibus supplier in Britain?
  • ... that a shark cost a competitor a silver medal in the spearfishing event at the 2014 Micronesian Games?
  • ... that Ivan Beshoff, the last survivor of the mutiny on the Potemkin, emigrated to Ireland where he established a fish and chip shop that is still run by his descendants?
  • ... that the Tellico Dam project was controversial for its acquisition of farmland for real estate development, loss of Native American sites, and damaging an endangered fish habitat?
  • ... that the abandoned New World Department Store in Bangkok became home to thousands of fish?

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"Here's our Jingle for goldfish. Yes, baked and not fried goldfish. The tasty snack that smiles back until you bite their heads off."

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Ichthyology : Fish anatomy, Fish development, Fish diseases, Fish locomotion, Fish migration, Ichthyology terms, Limnology, Marine biology, Meristics, Oceanography, Spawning
Taxa : Chondrichthyes, Osteichthyes, Actinopterygii, Sarcopterygii, Chondrostei, Neopterygii, Holostei, Teleostei, Osteoglossomorpha, Elopomorpha, Clupeomorpha, Ostariophysi, Cyclosquamata, Scopelomorpha, Lampridiomorpha, Polymyxiomorpha, Paracanthopterygii, Acanthopterygii
Fishery : Angling, Aquaculture, Fishing, Fish as food, Fish farming, Fish market, Fisheries management, Fishing industry, Overfishing
Food fish : Anchovy, Barb, Basa fish, Bass, Carp, Catfish, Cod, Eel, Flatfish, Goby, Gourami, Haddock, Herring, Mackerel, Oily fish, Perch, Pollock, Salmon, Snapper, Snakehead, Sturgeon, Tilapia, Trout, Tuna, Whitefish
Fishkeeping : Aeration, Aquarium, Fish food, Marine aquarium, Reef aquarium, Brackish water aquarium
Ornamental fish : Angelfish(freshwater), Angelfish(marine), Barb, Blenny, Boxfish, Butterflyfish, Cichlid, Chromis, Clownfish, Corydoras, Damsel, Danio, Discus, Goby, Goldfish, Gourami, Koi, Lionfish, Live-bearer, Loach, Mbuna, Rainbowfish, Pufferfish, Rasbora, Seahorse, Siamese fighting fish, Suckermouth catfish, Tang, Tetra, Triggerfish, Wrasse
Others : Amphibious fish, Electric fish, Deep sea fish, Ichthys, Mermaid, Prehistoric fish, Ray, Shark, Walking fish

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