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Portal:Fish

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Introduction

Giant grouper swimming among schools of other fish

Fish are gill-bearing aquatic craniate animals that lack limbs with digits. They form a sister group to the tunicates, together forming the olfactores. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Tetrapods emerged within lobe-finned fishes, so cladistically they are fish as well. However, traditionally fish are rendered paraphyletic by excluding the tetrapods (i.e., the amphibians, reptiles, birds and mammals which all descended from within the same ancestry). Because in this manner the term "fish" is defined negatively as a paraphyletic group, it is not considered a formal taxonomic grouping in systematic biology, unless it is used in the cladistic sense, including tetrapods. The traditional term pisces (also ichthyes) is considered a typological, but not a phylogenetic classification.

The earliest organisms that can be classified as fish were soft-bodied chordates that first appeared during the Cambrian period. Although they lacked a true spine, they possessed notochords which allowed them to be more agile than their invertebrate counterparts. Fish would continue to evolve through the Paleozoic era, diversifying into a wide variety of forms. Many fish of the Paleozoic developed external armor that protected them from predators. The first fish with jaws appeared in the Silurian period, after which many (such as sharks) became formidable marine predators rather than just the prey of arthropods.

Selected article

A whipnose angler (family Gigantactis)
Deep sea fish is a term for fish that live below the photic zone of the ocean. Examples include the lanternfish, flashlight fish[disambiguation needed], cookiecutter shark, bristlemouths, anglerfish, and viperfish

The fish of the deep sea are among the most strange and elusive creatures on Earth. Since many of these fish live in regions where there is no natural illumination, they cannot rely solely on their eyesight for locating prey and mates and avoiding predators; deep sea fish have evolved appropriately to the extreme sub-photic region in which they live.

Many deep sea fish are bioluminescent, with extremely large eyes adapted to the dark. Some have long feelers to help them locate prey or attract mates in the pitch black of the deep ocean. The deep sea angler fish in particular has a long fishing-rod-like adaptation protruding from its face, on the end of which is a bioluminescent piece of skin that wriggles like a worm to lure its prey. The lifecycle of deep sea fish can be exclusively deep water although some species are born in shallower water and sink on becoming adults. Most bioluminescent color of their light is blue and some of them will produce red light.

Selected fish

An ocean sunfish
The ocean sunfish (Mola mola) is the heaviest bony fish in the world, with an average weight of 1000 kilograms. The species is native to tropical and temperate waters around the globe. It resembles a fish head without a tail, and its main body is flattened laterally. Sunfish can be as tall as they are long, when their dorsal and anal fins are extended.

Sunfish live on a diet that consists mainly of jellyfish. As this diet is nutritionally poor, they consume large amounts in order to develop and maintain their great bulk. Females of the species can produce more eggs than any other known vertebrate. Sunfish fry resemble miniature pufferfish, with large pectoral fins, a tail fin and body spines uncharacteristic of adult sunfish.

Did you know...

  • Liposarcus multiradiatus 01 ssj 20050321.jpg
    ...that the Loricariidae or the suckermouth catfish from Central and South America is the largest family of catfish, with almost 700 species and new species being described each year?
  • King of herrings.png
    ...that the king of herrings (Regalecus glesne), an oarfish of the family Regalecidae, is the world's longest bony fish with a length of 41 feet (12 m)?
  • ...that the yoyo loach (Botia almorhae) from India and Pakistan is named for their black and white patterns, which often can be seen to spell "yoyo" especially in younger specimens?
  • Sillago parvisquamis.jpg
    ...that studies of the inshore marine fish small-scale whiting (Sillago parvisquamis) suggest the female starts life smaller than the male, but grows faster and is larger than the male within two years?
  • ... that the cream-spotted cardinalfish is the sole member of the new genus Ozichthys?

Selected images

The Fish Quiz

The Fish Quiz is a friendly quiz competition designed to test your general knowledge of fish. The current game is Fish Quiz Tournament X. You can read more and join the game here.

Selected quote

"So long, and thanks for all the fish!"

---Last sentence the dolphins sang to humans before they flew off to space, from The Hitchhiker's Guide to the Galaxy by Douglas Adams

Subcategories

Lists

WikiProjects

The Fish Portal: Mini Edition

The Mini Edition of the Fish Portal is available for you to use on your wikipedia user page or talk page. It uses minimum space but retains many crucial features of the portal. To use it, place {{Portal:Fish/Mini portal}} on the designated page. See here for an example of the mini portal on a user page.

Topics

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[disambiguation needed], 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

Things you can do

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Here are some tasks you can do, as organized by the WikiProject Fishes, if you are interested, please sign up on the project page.

  • Copyedit:
  • Expand: Barb (fish species), fishing industry, Greater Argentine, Gold Spot Pleco, Fish anatomy, Black goby, Poecilia caucana, Arrowtooth flounder, Paiute cutthroat trout, Serrasalmus, Pygocentrus, Greater pipefish, Lesser pipefish
  • Develop featured article:
  • Peer review: Spring cavefish, Convict cichlid, Hoplosternum littorale, Shortnose sturgeon
  • Article requests: Missing topics about Fish, Devonian Fish Project article requests, Jörg Freyhof
  • Picture request: Phreatobius cisternarum, Glandulocaudinae, Chaca (genus), Firewood catfish, Cetopsidae, Cranoglanis, Scoloplax, Nematogenys inermis, Austroglanis, Astroblepus, Pseudopimelodidae, Chiapas catfish (Upload any non-copyrighted fish images to the appropriate section of Wikimedia Commons)
  • Identify images: Identify and move the images to the appropriate section of Wikimedia Commons
  • Collaboration: Pacific jack mackerel (edit | talk | history | protect | delete | links | watch | logs | views)
  • Assessment: Assess the quality and importance of fish articles
  • Other: Expand Fish anatomy and Fish locomotion, Create articles for the missing superfamilies and families in the Perciformes. Merge GLAM/ARKive donated texts into articles about endangered species.
  • If you have any question, comment or suggestion, please discussion here.

    view edit discusshistorywatch

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