A fish is any member of a paraphyletic group of organisms that consist of all gill-bearing aquatic craniate animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups. Most fish are ectothermic ("cold-blooded"), allowing their body temperatures to vary as ambient temperatures change, though some of the large active swimmers like white shark and tuna can hold a higher core temperature.[1][2] Fish are abundant in most bodies of water. They can be found in nearly all aquatic environments, from high mountain streams (e.g., char and gudgeon) to the abyssal and even hadal depths of the deepest oceans (e.g., gulpers and anglerfish). At 32,000 species, fish exhibit greater species diversity than any other group of vertebrates.[3]
Fish are an important resource worldwide, especially as food. Commercial and subsistence fishers hunt fish in wild fisheries (see fishing) or farm them in ponds or in cages in the ocean (see aquaculture). They are also caught by recreational fishers, kept as pets, raised by fishkeepers, and exhibited in public aquaria. Fish have had a role in culture through the ages, serving as deities, religious symbols, and as the subjects of art, books and movies.
Because the term "fish" is defined negatively, and excludes the tetrapods (i.e., the amphibians, reptiles, birds and mammals) which descend from within the same ancestry, it is paraphyletic, and is not considered a proper grouping in systematic Biology. The traditional term pisces (also ichthyes) is considered a typological, but not a phylogenetic classification.
The earliest organisms that can be classified as fish were soft-bodied chordates that first appeared during the Cambrian period. Although they lacked a true spine, they possessed notochords which allowed them to be more agile than their invertebrate counterparts. Fish would continue to evolve through the Paleozoic era, diversifying into a wide variety of forms. Many fish of the Paleozoic developed external armor that protected them from predators. The first fish with jaws appeared in the Silurian period, after which many (such as sharks) became formidable marine predators rather than just the prey of arthropods.
Fishes belong to the scientific order "Osteichthyes" or "Actinopterygii" which includes bony fishes. The family of a fish varies depending on its species, for example, the zebrafish belongs to the family Cyprinidae.
Order is the category between family and class in scientific classification schemes. It groups together related families based on shared characteristics.
Family is a scientific name.The taxonomy classes are:Kingdom, Phylum, Class, Order, Family, Genus, Species.These can be remembered by King Prawn Curry Or Fat Greasy Sausages
The scientific name of fruit bats is Pteropodidae. They belong to the family Pteropodidae within the order Chiroptera.
The scientific taxonomy for banana is Musa spp. It belongs to the Musaceae family and the Musa genus.
The scientific name for a firefly is "Lampyridae" for the family of beetles to which fireflies belong.
arothron hispidus
Deer are of the family Cervidae in the order Artiodactyla.
Pipefishes or pipe-fishes (Syngnathinae)
Order is the category between family and class in scientific classification schemes. It groups together related families based on shared characteristics.
An anostomid is any member of the Anostomidae, a family of ray-finned fishes belonging to the order Characiformes, which live in freshwater habitats.
Family is a scientific name.The taxonomy classes are:Kingdom, Phylum, Class, Order, Family, Genus, Species.These can be remembered by King Prawn Curry Or Fat Greasy Sausages
The scientific name of fruit bats is Pteropodidae. They belong to the family Pteropodidae within the order Chiroptera.
Gulls ( not "seagulls" ) are in the family Laridae, with terns, subfamily Larinae.
Rats belong to the Rodent family. Scientific name: Rodentia
Any fish from the family Trachipteridae in the order Lampriformes
Siganids are perciform fishes in the family Siganidae.
Class: Mammalia Order: Carnivora Family: Felidae Genus: Panthera Species: Panthera Tigris