Fish do not represent a monophyletic group, and therefore the "evolution of fish" is not studied as a single event.. Early fish from the fossil record are represented by a group of small, jawless, armored fish known as ostracoderms.Jawless fish lineages are mostly extinct.
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fish: [noun] an aquatic animal. any of numerous cold-blooded strictly aquatic craniate vertebrates that include the bony fishes and usually the cartilaginous and jawless fishes and that have typically an elongated somewhat spindle-shaped body terminating in a broad caudal (see caudal 2) fin, limbs in the form of fins when present at all, and a ...
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Fish: 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.
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Fish definition, any of various cold-blooded, aquatic vertebrates, having gills, commonly fins, and typically an elongated body covered with scales. See more.
Fish (plural: fish or fishes) are vertebrates which live in water and respire (get oxygen) with gills.They lack limbs with digits (fingers & toes). This is a definition which does not quite work: some amphibia also live in water and have external gills, but they are not fishes.. Fish used to be a class of vertebrates.Now the term covers five classes of aquatic vertebrates: