Dec 21, 2025 · 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 …

fish, Any of more than 30,000 species of predominantly cold-blooded vertebrates found worldwide in fresh and salt water.

Dec 21, 2025 · Fish - Classification, Jawless, Cartilaginous & Bony Fishes: Fishes are typically divided into three groups: superclass Agnatha (jawless fishes), class Chondrichthyes (cartilaginous fishes), …

Introduction 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 discovered every …

Nov 14, 2025 · Anglerfish, any of about 210 species of marine fishes of the order Lophiiformes, named for the foremost spine of the dorsal fin located on the head modified into a “fishing rod” tipped with a …

Dec 10, 2025 · A number of the smaller species, especially those of the genus Corydoras, are popular aquarium fishes, while many of the larger catfishes are edible and used as food.

Dec 21, 2025 · 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 …

Dec 19, 2025 · Eel (order Anguilliformes), any of more than 800 species of teleost fishes characterized by elongate wormlike bodies. Anguilliforms include common freshwater eels as well as the voracious …

A number of the smaller species, especially those of the genus Corydoras, are popular aquarium fishes, while many of the larger catfishes are edible and used as food.

Special attention is given to determining the dynamics of marine ecosystems, particularly to the understanding of food chains and predator-prey relationships. Marine biological information on the …