Category:Fish

This category contains subcategories corresponding to the highest-level taxa of fish as well as articles and subcategories relating to non-taxonomic fish groupings or subjects.

Guidance
Fish have been studied by biologists for centuries, in what is called ichthyology. For more details refer to the Ichthyology category.
 * The study of fish (ichthyology)

Most fish that anglers catch while fishing are within Actinopterygii, the ray-finned fish. Further information about Fishing can be found in the Fishing category.
 * Fish caught by anglers or fishing

Details of fish eaten as food can be found in the Edible fish category
 * Fish as food

Most fish that aquarists are likely to have kept or seen are in Actinopterygii, the ray-finned fish. Further information on about fishkeeping can be found in the fishkeeping category, and Aquarium article.
 * Fish kept by aquarists

Taxonomic classes of fish
Modern fish (those that are not extinct) are found within two superclasses of the phylum Chordata. The superclasses are Agnatha the jawless vertebrates, and Gnathostomata (vertebrates with jaws). Within these superclasses there are four classes and two subclasses:
 * Modern fish (not extinct)


 * Superclass Agnatha Vertebrates without jaws, a paraphyletic superclass containing:
 * Class Myxini - hagfish
 * Class Cephalaspidomorphi - lampreys


 * Superclass Gnathostomata Vertebrates with jaws
 * Class Chondrichthyes (cartilagineous fish - sharks and rays)
 * Class Osteichthyes (bony fish), which has two subclasses:
 * Actinopterygii (ray-finned fish)
 * Sarcopterygii (lobe-finned fish)


 * Full details of higher order fish taxonomy can be found in the Chordata article.


 * Extinct and prehistoric fish
 * Details of extinct fish including prehistoric fish can be found here