Fish - Wikipedia
A fish (pl.: fish or fishes) is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits. Fish can be grouped into the more basal jawless fish and the more common jawed fish, the latter including all living cartilaginous and bony fish, as well as the extinct placoderms and ...
Fish | Definition, Species, Classification, & Facts | Britannica
2024年11月21日 · 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: Different Types, Definitions, Photos, and More - A-Z ...
2023年1月3日 · Instead, there are 3 main classes, groups, or types of fish: bony fish (Osteichthyes), jawless fish (Agnatha), and cartilaginous fish (Chondrichthyes). Fish are the most diverse group among vertebrates, with over 33,000 different types of fish species.
41 Types of Fish (Most Popular Saltwater and Freshwater Fish)
Fish are one of the first vertebrates that came to life on this planet. They hold the basic blueprint for all different types of body structures found on the planet and has evolved into all sorts of unusual species.
Fish: The Ultimate Guide To Fishes & Fish Life - Active Wild
2022年7月28日 · A fish is an aquatic vertebrate with fins and gills. The body of a typical fish is streamlined and covered in protective scales. Around half of all known vertebrates are fish, making fish the dominant vertebrate animals on the planet. Fish are found in both salt and freshwater habitats in most parts of the world.
Fish Pictures & Facts - National Geographic
All fish share two traits: they live in water and they have a backbone—they are vertebrates. Apart from these similarities, however, many of the species in this group differ markedly from one...
Fish - Simple English Wikipedia, the free encyclopedia
Fish (plural: fish or fishes) are a group of animals which live in water and respire (get oxygen) from their gills. As a group, they are much older than other vertebrates. The first fish developed about 500 million years ago. [4] Fish used to be a class of vertebrates. Now the term covers five classes of animals that live in the water: Jawless fish
Fish - Definition, Examples, Characteristics
2024年5月21日 · Fish are aquatic vertebrates that typically have gills, fins, and a streamlined body. They inhabit diverse environments, from freshwater rivers and lakes to salty oceans and deep seas. Shared Characteristics with Other Vertebrates. Fish, like all vertebrates, possess a backbone or spinal column.
Fish - A-Z Animals
2024年5月27日 · A fish is an aquatic vertebrate animal that typically uses gills for respiration. Its skull can be either bony or cartilaginous. Its fins, limbs adapted especially for traversing an aquatic habitat, lack individual digits such as fingers or toes. Summary. There are more than 34,000 species of fish.
Types of Fish - Fish & Fishing (U.S. National Park Service)
2018年2月13日 · Fish biologists have described more than 30,000 species of fish in the world. Visit NPSpecies to see what species of fish are found in national parks. Scientists classify fish into two major groups: the jawless (Agnatha) fishes and the jawed (Gnathastomata) fishes.