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  • Fish | Definition, Species, Classification, Facts | Britannica
    A fish is any of approximately 34,000 species of vertebrate animals found in the world’s fresh and salt waters The term fish is applied to a variety of vertebrates of several evolutionary lines It describes a life-form rather than a taxonomic group
  • Bony fish | Definition, Characteristics, Examples, Facts - Britannica
    fish, any of approximately 34,000 species of vertebrate animals (phylum Chordata) found in the fresh and salt waters of the world Living species range from the primitive jawless lampreys and hagfishes through the cartilaginous sharks, skates, and rays to the abundant and diverse bony fishes
  • Bioluminescence | Causes, Examples, Facts | Britannica
    bioluminescence, emission of light by an organism or by a laboratory biochemical system derived from an organism It could be the ghostly glow of bacteria on decaying meat or fish, the shimmering radiance of protozoans in tropical seas, or the flickering signals of fireflies
  • Definition, Examples, Levels, Classification - Britannica
    Popularly, classifications of living organisms arise according to need and are often superficial Anglo-Saxon terms such as worm and fish have been used to refer, respectively, to any creeping thing— snake, earthworm, intestinal parasite, or dragon —and to any swimming or aquatic thing
  • Aquaculture | Definition, Industry, Farming, Benefits, Types, Facts . . .
    Aquaculture, the propagation and husbandry of aquatic plants, animals, and other organisms for commercial, recreational, and scientific purposes It is an approximate aquatic equivalent to agriculture—that is, the rearing of certain marine and freshwater organisms to supplement the natural supply
  • Marine ecosystem | Definition, Food Web, Plants, Animals . . .
    Fossils of familiar organisms such as cnidaria (e g , jellyfish), echinoderms (e g , feather stars), precursors of the fishes (e g , the protochordate Pikaia from the Burgess Shale of Canada), and other vertebrates are found in marine sediments of this age
  • Fish species and physical features | Britannica
    fish, Any of more than 30,000 species of predominantly cold-blooded vertebrates found worldwide in fresh and salt water
  • Marine ecosystem - Plankton, Microbes, Zooplankton | Britannica
    Organisms are abundant in surface sediments of the continental shelf and in deeper waters, with a great diversity found in or on sediments In shallow waters, beds of seagrass provide a rich habitat for polychaete worms, crustaceans (e g , amphipods), and fishes
  • Food chain | Definition, Types, Facts | Britannica
    Food chain, in ecology, the sequence of transfers of matter and energy in the form of food from organism to organism Food chains intertwine locally into a food web because most organisms consume more than one type of animal or plant
  • Eutrophication | Definition, Types, Causes, Effects | Britannica
    In the Black Sea and elsewhere, hypoxic waters from cultural eutrophication have resulted in massive fish kills, with rippling effects throughout the food chain and local economies Coastal marine systems also may be affected by this process





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