Fish | Definition, Species, Classification, & Facts | Britannica
Nov 21, 2024 · 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 …
Fish - Classification, Jawless, Cartilaginous & Bony Fishes | Britannica
Nov 21, 2024 · Fish - Classification, Jawless, Cartilaginous & Bony Fishes: Fishes are typically divided into three groups: superclass Agnatha (jawless fishes), class Chondrichthyes …
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. Living species range from the primitive lampreys and hagfishes …
Shark | Attacks, Types, & Facts | Britannica
Nov 12, 2024 · Normally, sharks feed on fish, often attacking in schools. Open-ocean species such as the mackerel (Lamna), mako (Isurus), and thresher (Alopias) sharks frequently feed …
10 of the World’s Most Dangerous Fish | Britannica
The beauty of many fish species is highlighted in fish stores, aquariums, and in home collections. Some species, however, have darker, more terrifying aspects. A select few of these may …
List of mollusks | Gastropods, Bivalves, Cephalopods | Britannica
Along with the insects and vertebrates, mollusks are one of the most diverse groups in the animal kingdom, with nearly 100,000 (possibly as many as 150,000) described species. This is a list …
Fish - Habitats, Migration, Abundance | Britannica
Nov 21, 2024 · Fish - Habitats, Migration, Abundance: Almost all natural bodies of water bear fish life, except for hot thermal ponds and extremely salt-alkaline lakes. Fishes may be seen to be …
fish - Kids | Britannica Kids | Homework Help
Fish are a kind of animal that lives in water. Fish have lived on Earth for more than 450 million years. There are more than 24,000 species, or kinds, of fish. New ones are…
Tuna | Definition, Characteristics, Species, & Facts | Britannica
Nov 4, 2024 · Tuna, any of seven species of oceanic fishes, some very large, that constitute the genus Thunnus and are of great commercial value as food. Tunas are elongated, robust, and …
Fish Portal | Britannica
Almost all natural bodies of water bear fish life, with the exception of very hot thermal ponds and extremely salt-alkaline lakes, such as the Dead Sea in Asia and the Great Salt Lake in North …