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Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of living fish species are ray-finned fish, belonging to the class Actinopterygii,
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See moreThe word for fish in English and the other Germanic languages (German Fisch; Gothic fisks) is inherited from Proto-Germanic, and is related to the Latin piscis and Old Irish īasc, though the exact root is unknown; some
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See moreRespiration
Gills
Most fish exchange gases using gills on either side of the pharynx. Gills consist of threadlike structures called filaments. Each filament contains a capillary network that provides a large...
See moreAcoustic communication in fish involves the transmission of acoustic signals from one individual of a species to another. The production of sounds as a
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See moreThe 2006 IUCN Red List names 1,173 fish species that are threatened with extinction. Included are species such as Atlantic cod
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See moreFish, as vertebrata, developed as sister of the tunicata. As the tetrapods emerged deep within the fishes group, as sister of the lungfish, characteristics of fish are typically shared by
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See moreLike other animals, fish suffer from diseases and parasites. To prevent disease they have a variety of defenses. Non-specific defenses include the skin and scales, as well as the
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See moreEconomic
Throughout history, humans have utilized fish as a food source. Historically and today, most fish protein has come by means of catching wild fish. However, aquaculture, or fish farming, which has been practiced since...
See more fish | Definition, Species, Classification, & Facts | Britannica
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