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 primitive jawless lampreys and hagfishes through the cartilaginous sharks, skates, and rays to the abundant and diverse bony fishes.
Fish - Classification, Jawless, Cartilaginous & Bony Fishes | Britannica
Nov 21, 2024 · Fishes are typically divided into three groups: superclass Agnatha (jawless fishes), class Chondrichthyes (cartilaginous fishes), and superclass Osteichthyes (bony fishes). The latter two groups are included within the infraphylum Gnathostomata, a category containing all …
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 through the cartilaginous shark s, skates, and ray s to the abundant and diverse bony fishes.
fish - Kids | Britannica Kids | Homework Help
The many different kinds of fish have some things in common. They are all vertebrates, which means that they have a backbone. They are cold-blooded, which means that their body temperature changes along with the temperature of their surroundings. Fish generally breathe through organs called gills.
Animal Kingdom Kids - Britannica Kids
All the different types of fish are typically grouped into three general classes: jawless fishes, cartilaginous fishes, and bony fishes. Cartilaginous fishes have cartilage instead of bones.
Sardine | Health Benefits, Types & Recipes | Britannica
Dec 2, 2024 · The five species are found in different areas of the Pacific and Indian oceans and are fished off of western North and South America, Japan, Australia, and South Africa. Sardines are small, silvery, elongated fishes with a single short …
Anglerfish | Deep-sea, Benthic, Adaptations | Britannica
Anglerfish, any of about 210 species of marine fishes of the order Lophiiformes. Anglers are named for their method of “fishing” for their prey. The foremost spine of the dorsal fin is located on the head and is modified into a “fishing rod” tipped with a fleshy “bait.”
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 distributed according to habitat and geographical area.
eel - Kids | Britannica Kids | Homework Help
Eels are fishes that look like snakes. There are hundreds of different species, or types, of eel. They belong to a large group of fishes called the eel order.
Shark | Attacks, Types, & Facts | Britannica
Dec 26, 2024 · Shark, any of numerous species of cartilaginous fishes that make up the order Selachii (class Chondrichthyes). Most species have a tough skin that is dull gray in color and roughened by toothlike scales.