Portal:Fish

The Fish Portal

A fish 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 from the long tradition of grouping all fish into a single class (Pisces), modern phylogenetics views fish as a paraphyletic group which includes all vertebrates except tetrapods. In English, the plural of "fish" is fish when referring to individuals and fishes when referring to species.

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 lobe-finned and ray-finned fishes. 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. (Full article...)

Selected article –


  • Smalltooth sand tiger in captivity

    The smalltooth sand tiger or bumpytail ragged-tooth (Odontaspis ferox) is a species of mackerel shark in the family Odontaspididae, with a patchy but worldwide distribution in tropical and warm temperate waters. They usually inhabit deepwater rocky habitats, though they are occasionally encountered in shallow water, and have been known to return to the same location year after year. This rare species is often mistaken for the much more common sand tiger shark (Carcharias taurus), from which it can be distinguished by its first dorsal fin, which is larger than the second and placed further forward. It grows to at least 5.2 m (17 ft) in length. They have also been recently sighted in Irish and English waters.

    Very little is known of the biology and behavior of the smalltooth sand tiger. It is an active predator of benthic bony fishes, invertebrates, and cartilaginous fishes. This species is thought to be ovoviviparous with oophagous embryos like other mackerel sharks. In contrast to its formidable size and appearance, this shark is harmless, having never been known to behave aggressively towards humans. Concern exists that its numbers are declining due to human activities in the Mediterranean and elsewhere, though existing data are inadequate for a full assessment of its conservation status. (Full article...)

  • The Japanese angelshark (Squatina japonica) is a species of angelshark, family Squatinidae, found in the northwestern Pacific Ocean off China, Japan, and Korea. It is a bottom-dwelling shark found in sandy habitats down to 300 m (980 ft) deep. This species has the flattened shape with wing-like pectoral and pelvic fins typical of its family, and grows to 1.5 m (4.9 ft) or more in length. Its two dorsal fins are placed behind the pelvic fins, and a row of large thorns occurs along its dorsal midline. Its upper surface is cryptically patterned, with numerous squarish dark spots on a brown background.

    Feeding on fishes, cephalopods, and crustaceans, the Japanese angelshark is a nocturnal ambush predator that spends most of the day lying still on the sea floor. This species gives birth to live young, which are sustained during gestation by yolk. The litter size varies from two to 10. The Japanese angelshark is not dangerous to humans unless provoked. It is fished in large numbers and used for meat and shagreen, a type of leather. (Full article...)

  • The mangrove whipray (Urogymnus granulatus) or whitetail stingray, is a species of stingray in the family Dasyatidae. It is widely distributed in the Indo-Pacific region from the Red Sea to northern Australia and Micronesia. A benthic inhabitant of shallow inshore waters, juvenile mangrove whiprays favor mangrove and estuarine habitats, while adults favor sandy to rocky areas in lagoons and coral reefs. This species can be identified by its thick, oval pectoral fin disc that is dark gray above with numerous white flecks, and by its relatively short, whip-like tail that is white past the stinging spine. It grows up to 1.4 m (4.6 ft) across.

    Solitary in nature, the mangrove whipray preys mainly on small, bottom-dwelling bony fishes and invertebrates. It is, like other stingrays, aplacental viviparous, with the females nourishing their unborn young via histotroph ("uterine milk"). The mangrove whipray is caught for its meat, skin, and cartilage across much of its range. The International Union for Conservation of Nature (IUCN) has assessed it as Vulnerable globally and as Endangered in Southeast Asia, where its population has declined substantially due to intensive artisanal and commercial fisheries as well as widespread habitat degradation. In particular, juvenile rays have been disproportionately targeted by fishers and affected by the large-scale destruction of mangrove forests. (Full article...)

  • A grey reef shark
    (Carcharhinus amblyrhynchos)

    Sharks are a group of elasmobranch cartilaginous fishes characterized by a ribless endoskeleton, dermal denticles, five to seven gill slits on each side, and pectoral fins that are not fused to the head. Modern sharks are classified within the division Selachii and are the sister group to the Batomorphi (rays and skates). Some sources extend the term "shark" as an informal category including extinct members of Chondrichthyes (cartilaginous fish) with a shark-like morphology, such as hybodonts. Shark-like chondrichthyans such as Cladoselache and Doliodus first appeared in the Devonian Period (419–359 million years), though some fossilized chondrichthyan-like scales are as old as the Late Ordovician (458–444 million years ago). The earliest confirmed modern sharks (Selachii) are known from the Early Jurassic around 200 million years ago, with the oldest known member being Agaleus, though records of true sharks may extend back as far as the Permian.

    Sharks range in size from the small dwarf lanternshark (Etmopterus perryi), a deep sea species that is only 17 centimetres (6.7 in) in length, to the whale shark (Rhincodon typus), the largest fish in the world, which reaches approximately 12 metres (40 ft) in length. They are found in all seas and are common to depths up to 2,000 metres (6,600 ft). They generally do not live in freshwater, although there are a few known exceptions, such as the bull shark and the river sharks, which can be found in both seawater and freshwater, and the Ganges shark, which lives only in freshwater. Sharks have a covering of placoid scales (denticles) that protects the skin from damage and parasites in addition to improving their fluid dynamics. They have numerous sets of replaceable teeth. (Full article...)

  • The puffadder shyshark (Haploblepharus edwardsii), also known as the Happy Eddie, is a species of shark belonging to the family Pentanchidae, the deepwater catsharks. This species is endemic to the temperate waters off the coast of South Africa. This common shark is found on or near the bottom in sandy or rocky habitats, from the intertidal zone to a depth of 130 m (430 ft). Typically reaching 60 cm (24 in) in length, the puffadder shyshark has a slender, flattened body and head. It is strikingly patterned with a series of dark-edged, bright orange "saddles" and numerous small white spots over its back. The Natal shyshark (H. kistnasamyi), formally described in 2006, was once considered to be an alternate form of the puffadder shyshark.

    When threatened, the puffadder shyshark (and other members of its genus) curls into a circle with its tail covering its eyes, giving rise to the local names "shyshark" and "doughnut". It is a predator that feeds mainly on crustaceans, polychaete worms, and small bony fishes. This shark is oviparous and females deposit egg capsules singly or in pairs onto underwater structures. Harmless to humans, the puffadder shyshark is usually discarded by commercial and recreational fishers alike for its small size. It has been assessed as endangered by the International Union for Conservation of Nature (IUCN), as its entire population is located within a limited area and could be affected by a local increase in fishing pressure or habitat degradation. (Full article...)

  • The Borneo shark (Carcharhinus borneensis) is a species of requiem shark, and part of the family Carcharhinidae. Extremely rare, it is known only from inshore waters around Mukah in northwestern Borneo, though it may once have been more widely distributed. A small, gray shark reaching 65 cm (26 in) in length, this species is the only member of its genus with a row of enlarged pores above the corners of its mouth. It has a slender body with a long, pointed snout and a low second dorsal fin placed posterior to the anal fin origin.

    Almost nothing is known about the natural history of the Borneo shark. It is viviparous like other requiem sharks; the females bear litters of six pups, which are provisioned through gestation by a placental connection. The International Union for Conservation of Nature last assessed this species as Critically Endangered. While an extant population has since been found, the Borneo shark continues to merit conservation concern given its highly limited range within heavily fished waters. (Full article...)

  • The thornback guitarfish (Platyrhinoidis triseriata) is a species of ray in the family Platyrhinidae, and the only member of its genus. Despite its name and appearance, it is more closely related to electric rays than to true guitarfishes of the family Rhinobatidae. This species ranges from Tomales Bay to the Gulf of California, generally in inshore waters no deeper than 6 m (20 ft). It can be found on or buried in sand or mud, or in and near kelp beds. Reaching 91 cm (36 in) in length, the thornback guitarfish has a heart-shaped pectoral fin disc and a long, robust tail bearing two posteriorly positioned dorsal fins and a well-developed caudal fin. The most distinctive traits of this plain-colored ray are the three parallel rows of large, hooked thorns that start from the middle of the back and run onto the tail.

    Encountered singly or in groups, the thornback guitarfish feeds on small, benthic invertebrates and bony fishes. It is aplacental viviparous, with the developing young drawing sustenance from a yolk sac. Females give birth to 1–15 pups annually in late summer, following a roughly year-long gestation period. The International Union for Conservation of Nature (IUCN) has listed the thornback guitarfish under Least Concern because the majority of its range lies within United States waters, where it is common since it has no commercial value and is not heavily fished commercially or recreationally. The status of this species in Mexican waters is inadequately known but may be more precarious. (Full article...)

  • Rhina ancylostoma, also known as the bowmouth guitarfish, shark ray or mud skate, is a species of ray and a member of the family Rhinidae. Its evolutionary affinities are not fully resolved, though it may be related to true guitarfishes and skates. This rare species occurs widely in the tropical coastal waters of the western Indo-Pacific, at depths of up to 90 m (300 ft). Highly distinctive in appearance, Rhina ancylostoma has a wide and thick body with a rounded snout and large shark-like dorsal and tail fins. Its mouth forms a W-shaped undulating line, and there are multiple thorny ridges over its head and back. It has a dorsal color pattern of many white spots over a bluish gray to brown background, with a pair of prominent black markings over the pectoral fins. This large species can reach a length of 2.7 m (8.9 ft) and weight of 135 kg (298 lb).

    Usually found near the sea floor, the bowmouth guitarfish prefers sandy or muddy areas near underwater structures. It is a strong-swimming predator of bony fishes, crustaceans, and molluscs. This species gives live birth to litters of two to eleven pups, which are nourished during gestation by yolk. The International Union for Conservation of Nature (IUCN) has assessed Rhina ancylostoma as Critically Endangered because it is widely caught by artisanal and commercial fisheries for its valuable fins and meat. It is viewed as a nuisance by trawlers, however, because its bulk and thorny skin cause it to damage netted catches. Habitat degradation and destruction pose an additional, significant challenge to this ray's survival. The bowmouth guitarfish adapts well to captivity and is displayed in public aquariums. (Full article...)

  • The goblin shark (Mitsukurina owstoni) is a rare species of deep-sea shark. Sometimes called a "living fossil", it is the only extant representative of the family Mitsukurinidae, a lineage some 125 million years old. This pink-skinned animal has a distinctive profile with an elongated, flat snout, and highly protrusible jaws containing prominent nail-like teeth. It typically reaches a length of 3 to 4 meters (10 to 13 feet) when fully grown, although it can grow significantly larger—such as one specimen captured in 2000, which was believed to measure around 6 meters (20 feet). Goblin sharks are benthopelagic creatures that inhabit upper continental slopes, submarine canyons, and seamounts throughout the world at depths greater than 100 m (330 ft), with adults found deeper than juveniles. Some researchers believed that these sharks could also dive to depths of up to 1,300 m (4,270 ft), for short periods; footage captured in 2024 suggests that their range could be deeper than previously thought, with a confirmed sighting of an adult swimming at 2,000 m (6,560 ft).

    Various anatomical features of the goblin shark, such as its flabby body and small fins, suggest that it is sluggish in nature. This species hunts for teleost fishes, cephalopods, and crustaceans near the sea floor and in the middle of the water column. Its long snout is covered with ampullae of Lorenzini that sense minute electric fields produced by nearby prey, which it can snatch up by rapidly extending its jaws. Small numbers of goblin sharks are unintentionally caught by deepwater fisheries. The International Union for Conservation of Nature (IUCN) has assessed it as Least Concern, despite its rarity, citing its wide distribution and low incidence of capture. (Full article...)

  • The Sacred Cod in its "natural habitat".
    "Humble the subject and homely the design; yet this painted image bears on its finny front a majesty greater than the dignity that art can lend to graven gold or chiselled marble", said an 1895 paean by Massachusetts legislators.[C]: 12 

    The Sacred Cod is a four-foot-eleven-inch (150 cm) carved-wood effigy of an Atlantic codfish, painted to the life, hanging in the House of Representatives chamber of Boston's Massachusetts State House‍—‌"a memorial of the importance of the Cod-Fishery to the welfare of this Commonwealth"
    (i.e. Massachusetts, of which cod is officially the "historic and continuing symbol").
    The Sacred Cod has gone through as many as three incarnations over three centuries: the first
    (if it really existed‍—‌the authoritative source calling it a "prehistoric creature of tradition")
    was lost in a 1747 fire; the second disappeared during the American Revolution; and the third, installed in 1784, is the one seen in the House chamber today.

    "Sacred Cod" is not a formal name but a nickname which appeared in 1895, soon after the carving was termed "the sacred emblem" by a House committee appointed "to investigate the significance of the emblem [which] has kept its place under all administrations, and has looked upon outgoing and incoming legislative assemblies, for more than one hundred years".[C]: 3–4, 12  Soon sacred cod was being used in reference to actual codfish as well, in recognition of the creature's role in building Massachusetts's prosperity and influence since early colonial times. (Full article...)

  • at Steinhart Aquarium in California

    Anableps anableps, the largescale four-eyes, is a species of four-eyed fish found in fresh and brackish waters of northern South America and Trinidad. This species grows to a length of 24.5 centimetres (9.6 in) standard length (SL). This fish can occasionally be found in the aquarium trade. The fish does not actually have four eyes. Instead, each eye is split into two lobes by a horizontal band of tissue, each lobe with its own pupil and separate vision. This allows the fish to see above and below the surface of the water at the same time. This species has been documented to occasionally feed on land. Both sexes exhibit asymmetrical genitalia. (Full article...)

  • The common torpedo (Torpedo torpedo), also known as ocellate torpedo or eyed electric ray, is a species of electric ray in the family Torpedinidae. It is found in the Mediterranean Sea and the eastern Atlantic Ocean from the Bay of Biscay to Angola, and is a benthic fish typically encountered over soft substrates in fairly shallow, coastal waters. Growing to 60 cm (24 in) long, this species has a nearly circular pectoral fin disc and a short, thick tail with two dorsal fins of nearly equal size and a large caudal fin. It can be identified by the prominent blue spots on its back, which usually number five but may vary from zero to nine, as well as by the small knobs on the rims of its spiracles.

    For attack and defense, the common torpedo can deliver a strong electric shock of up to 200 volts. It is a solitary, nocturnal ambush predator that feeds mainly on bony fishes and crustaceans. This species is aplacental viviparous, with the developing embryos nourished by yolk and histotroph ("uterine milk") produced by the mother. Females produce litters of up to 28 young every year in late summer or autumn, after a gestation period of 4–8 months; the specifics vary between geographical regions. The common torpedo's shock is painful but otherwise of little danger to humans. Its electrogenic properties led it to be used in medicine by the ancient Greeks and Romans. In modern times, it has no economic value and is mostly discarded when caught as bycatch in fisheries. The impact of fishing on its population is uncertain, and the International Union for Conservation of Nature (IUCN) has listed it as Vulnerable. (Full article...)

  • The Australian blacktip shark (Carcharhinus tilstoni) is a species of requiem shark, in the family Carcharhinidae, endemic to northern and eastern Australia. Favoring the upper and middle parts of the water column, it can be found from the intertidal zone to a depth of 50 m (160 ft). Appearance-wise this species is virtually identical to the common blacktip shark (C. limbatus), from which it can be reliably distinguished only by its lower vertebra number and by genetic markers. Generally reaching 1.5–1.8 m (4.9–5.9 ft) in length, it is a fairly stout-bodied, bronze-colored shark with a long snout and black-tipped fins.

    Primarily piscivorous, the Australian blacktip shark forms large groups of similar size and sex that tend to remain within a local area. It exhibits viviparity, meaning that the unborn young are provisioned through a placental connection. There is a well-defined annual reproductive cycle with mating occurring in February and March. Females bear one to six pups around January of the following year, after a 10-month gestation period. The Australian blacktip shark is among the sharks most commonly caught by northern Australian commercial fisheries. It is mainly valued for its meat, which is sold as "flake". This species was an important catch of a Taiwanese gillnet fishery that operated from 1974 to 1986, and of the Australian Northern Shark Fishery that continues to the present day. As current fishing levels are not thought to threaten this shark's population, the International Union for Conservation of Nature (IUCN) has assessed it as Least Concern. (Full article...)

  • The yellowtail flounder (Limanda ferruginea), also known as the rusty dab, is a species of flatfish in the family Pleuronectidae (righteye flounders). Reaching 56 cm (22 in) in length, it has reddish brown upperparts, pale underparts and yellow fins. Both its eyes are on the right (upper) side of its body. Found in the western North Atlantic, it has been fished commercially by North American fisheries for food. A victim of overfishing, the yellowtail flounder is categorized as "Vulnerable" by the International Union for Conservation of Nature. (Full article...)

  • Adult individuals

    Trichogenes claviger, the Caetés catfish, is a critically endangered species of freshwater ray-finned fish belonging to the family Trichomycteridae, the pencil and parasitic catfishes. This species is endemic to streams in the Atlantic Forest of Brazil. It was discovered early in 2010 and scientifically described later that year. One of three species within the genus Trichogenes, it is restricted to an area of 16 km2 (6.2 sq mi) in the Caetés forest, a mountainous area in the Brazilian state of Espírito Santo. When discovered, the rainforest in which it occurs was unprotected and threatened by deforestation. A private nature reserve has since been established, allowing visitors to see the fish in its habitat.

    A small fish, T. claviger is up to 50.8 mm (2.00 in) in length. A series of black dots runs along the side of the body, distinguishing it from related species. Males have a bony protrusion from the gill area (the opercular process) that is elongated and club-like, a feature that inspired the name of the species (claviger – 'club-bearing'). The opercular process in T. claviger is the only known secondary sex characteristic in pencil catfishes, and might have evolved for sexual signaling; it is also used by the fish to climb up net walls when caught. The mouth is terminal (faces forwards rather than being upturned or downturned); this feature is also found in its closest relative, T. beagle, but absent in all other members of their family. It is known to gulp air from the water surface; when carrying air, the body tilts downward. The species lives in small, shaded, and slow-moving streams in the rainforest, and mostly feeds on insects that have fallen on the water surface. It is the only fish in its habitat. (Full article...)

Selected fish –

From the Suwanee River, Florida

The ruddy bowfin (Amia calva) is a ray-finned fish native to North America. Common names include mudfish, mud pike, dogfish, grindle, grinnel, swamp trout, and choupique. It is regarded as a relict, being one of only two surviving species of the Halecomorphi, a group of fish that first appeared during the Early Triassic, around 250 million years ago. The bowfin is often considered a "living fossil" because they have retained some morphological characteristics of their early ancestors. It is one of two species in the genus Amia, along with Amia ocellicauda, the eyespot bowfin. The closest living relatives of bowfins are gars, with the two groups being united in the clade Holostei.

Bowfins are demersal freshwater piscivores, commonly found throughout much of the eastern United States, and in southern Ontario and Quebec. Fossil deposits indicate Amiiformes were once widespread in both freshwater and marine environments across North and South America, Europe, Asia, and Africa. Now, their range is limited to much of the eastern United States and adjacent southern Canada, including the drainage basins of the Mississippi River, Great Lakes, and various rivers exiting in the Eastern Seaboard or Gulf of Mexico. Their preferred habitat includes vegetated sloughs, lowland rivers and lakes, swamps, and backwater areas; they are also occasionally found in brackish water. They are stalking, ambush predators known to move into the shallows at night to prey on fish and aquatic invertebrates such as crawfish, mollusks, and aquatic insects. (Full article...)

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"Away with the superficial and selfish philanthropy of men; who knows what admirable virtue of fishes may be below low-water-mark, bearing up against a hard destiny, not admired by that fellow-creature who alone can appreciate it! Who hears the fishes when they cry?."

---Henry David Thoreau, from A Week on the Concord and Merrimack Rivers

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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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