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  2. Fish - Wikipedia

    en.wikipedia.org/wiki/Fish

    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.

  3. Diversity of fish - Wikipedia

    en.wikipedia.org/wiki/Diversity_of_fish

    For example, the blue shark feeds on dead whales and nearly everything else that wriggles: other fish, cephalopods, gastropods, ascidians, or crustaceans. [ 87 ] [ 88 ] Ocean sunfish prefer jellyfish .

  4. Osteichthyes - Wikipedia

    en.wikipedia.org/wiki/Osteichthyes

    Osteichthyes (/ ˌ ɒ s t iː ˈ ɪ k θ iː z / ost-ee-IK-theez), [2] also known as osteichthyans or commonly referred to as the bony fish, is a diverse superclass of vertebrate animals that have endoskeletons primarily composed of bone tissue.

  5. Taxonomy of fish - Wikipedia

    en.wikipedia.org/wiki/Taxonomy_of_fish

    Fishes are a paraphyletic group and for this reason, the class Pisces seen in older reference works is no longer used in formal taxonomy.Traditional classification divides fish into three extant classes (Agnatha, Chondrichthyes, and Osteichthyes), and with extinct forms sometimes classified within those groups, sometimes as their own classes: [1]

  6. Fish physiology - Wikipedia

    en.wikipedia.org/wiki/Fish_physiology

    Some fish are hermaphrodites, having both testes and ovaries either at different phases in their life cycle or, as in hamlets, have them simultaneously. Over 97% of all known fish are oviparous, [74] that is, the eggs develop outside the mother's body. Examples of oviparous fish include salmon, goldfish, cichlids, tuna, and eels.

  7. Ostariophysi - Wikipedia

    en.wikipedia.org/wiki/Ostariophysi

    Ostariophysi is the second-largest superorder of fish.Members of this superorder are called ostariophysians.This diverse group contains 10,758 species, about 28% of known fish species in the world and 68% of freshwater species, and are present on all continents except Antarctica.

  8. Freshwater fish - Wikipedia

    en.wikipedia.org/wiki/Freshwater_fish

    Freshwater fish are fish species that spend some or all of their lives in bodies of fresh water such as rivers, lakes and inland wetlands, where the salinity is less than 1.05%. These environments differ from marine habitats in many ways, especially the difference in levels of osmolarity .

  9. Fish stocks - Wikipedia

    en.wikipedia.org/wiki/Fish_stocks

    The World Wildlife Fund and the Zoological Society of London jointly issued their "Living Blue Planet Report" on 16 September 2015 which states that there was a dramatic fall of 74% in world-wide stocks of the important scombridae fish such as mackerel, tuna and bonitos between 1970 and 2010, and the global overall "population sizes of mammals ...