Catalog of Fishes is a comprehensive on-line database and reference work on the scientific names of fish species and genera. It is global in its scope and is hosted by the California Academy of Sciences. It has been compiled and is continuously updated by the curator emeritus of the CAS fish collection, William N. Eschmeyer.
The taxonomy maintained by the Catalog of Fishes is considered authoritative and it is used as a baseline reference for instance by the broader global fish database FishBase,   which involves cross-references to the Catalog's information for all accepted taxa. As of 2015 [update] , the searchable catalogue contains entries for about 58,300 fish species names, about 33,400 of which are currently accepted (valid), and for some 10,600 genera (5,100 valid).   The information given for any species name generally contains the reference to the original description, to the type specimen, references to the usage of the name in taxonomic literature, a statement of the current status of the name and valid name of the taxon, and the family it belongs to.
A printed 3000-page three-volume and CD version of the Catalogue was published in 1998. That was preceded by a Catalog of the genera of recent fishes in 1990. 
The Catalog was renamed Eschmeyer's Catalog of Fishes in 2019, and is now edited by Ronald Fricke, Richard van der Laan and William N. Eschmeyer. It is available online, and updated monthly.
Mitsukurinidae is a family of sharks with one living genus, Mitsukurina, and four fossil genera: Anomotodon, Protoscapanorhynchus, Scapanorhynchus, and Woellsteinia, though some taxonomists consider Scapanorhynchus to be a synonym of Mitsukurina. The only known living species is the goblin shark, Mitsukurina owstoni.
Gadus is a genus of demersal fish in the family Gadidae, commonly known as cod, although there are additional cod species in other genera. The best known member of the genus is the Atlantic cod.
Sebastinae is a subfamily of marine fish belonging to the family Scorpaenidae in the order Scorpaeniformes. Their common names include rockfishes, rock perches, ocean perches, sea perches, thornyheads, scorpionfishes, sea ruffes and rockcods. Despite the latter name, they are not closely related to the cods in the genus Gadus, nor the rock cod, Lotella rhacina.
Acropomatidae is a family of fish in the order Perciformes, commonly known as lanternbellies. Acropoma species are notable for having light-emitting organs along their undersides. They are found in all temperate and tropical oceans, usually at depths of several hundred meters. There are about 32 species in as many as 9 genera, although some authorities recognise fewer genera than Fishbase does.
Trichogaster is a genus of gouramis native to South Asia from Pakistan to Myanmar. It is the only genus in the monotypic subfamily Trichogastrinae as set out in the 5th Edition of Fishes of the World, although that book states that there are two genera, the other being Colisa which is treated as a synonym of Trichogaster by Fishbase and the Catalog of Fishes. Fishbase also places the genus in the Luciocephalinae. Species of this genus are very popular in the aquarium trade.
The Bathydraconidae, or the Antarctic dragonfishes, are a family of marine ray-finned fishes, notothenioids belonging to the Perciform suborder Notothenioidei. The family comprises four genera. These fishes are endemic to deep waters off Antarctica.
Stichaeidae, the pricklebacks or shannies, are a family of marine ray-finned fishes in the suborder Zoarcoidei of the order Scorpaeniformes. Most species are found in the North Pacific Ocean with a few in the North Atlantic Ocean.
Parascorpaena is a genus of marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. They are native to the Indian Ocean and the western Pacific Ocean.
Forcipiger is a genus of fish in the family Chaetodontidae, the butterflyfishes. It is distributed throughout the Indo-Pacific region. The name of this genus means “bearing forceps” and is a reference to the long, slender snouts of the species in this genus.
The Platycephalidae are a family of marine fish, most commonly referred to as flatheads. They are relatives of the popular lionfish, belonging to the order Scorpaeniformes.
Plectropomus, commonly known as the coral groupers, is a genus of marine ray-finned fish, groupers from the subfamily Epinephelinae, part of the family Serranidae, which also includes the anthias and sea basses. They are found in the Indo-Pacific region.
Variola, the lyretails, is a genus of marine ray-finned fish, groupers from the subfamily Epinephelinae, part of the family Serranidae, which also includes the anthias and sea basses. They are found in the tropical Indo-Pacific and their distribution extends from the Red Sea to South Africa across the Indian Ocean and east to the islands of the central Pacific.
Echeneis is a genus of fish in the family Echeneidae, the remoras. The genus is distributed in the Atlantic, Pacific and Indian Oceans.
The dusky velvetfish is a species of marine ray-finned fish, a velvetfish belonging to the family Aploactinidae. It is the only member of the monotypic genus Aploactis. This species is found in the western Pacific Ocean.
Leptosynanceia is a monotypic genus of ray-finned fish belonging to the subfamily Synanceiinae, the stonefishes, which is classified within the family Scorpaenidae, the scorpionfishes and relatives, its only species is Leptosynanceia asteroblepa which is called the mangrove stonefish in Malaysia. This species native to the brackish and fresh waters of Southeast Asia. This species grows to a total length of 23 centimetres (9.1 in). This species is an extremely dangerous fish whose venom can cause a human to die within 1 to 2 hours after contact. The pain caused by the venom is described as "agonizing".
Boleophthalmus is a genus of mudskippers native to the Indian Ocean and the western Pacific Ocean.
Pseudocaranx is a genus of ray-finned fishes from the family Carangidae, the jacks, trevallies, scads, and pompanos. They occur in the western Atlantic Ocean and the Indo-Pacific.
The Cichlid Room Companion (CRC), is a membership-based webpage dedicated to the fishes of the Cichlid family (Cichlidae). The site was launched in November 1997 and offers arguably the most comprehensive authoritative catalogue of cichlids in the web, which is illustrated with more than 20,000 photographs of fishes and 1,000 of habitats, as well as over 270 videos of cichlids and their habitats. It also “offers access to information about over 150 full genera and 900 full species profiles”, a discussion forum, as well as various articles about taxonomy, natural history, fish-keeping, field accounts, collecting expeditions and other cichlid related topics; mostly written by citizen scientists and people who specialize in cichlids. The species summaries provided in the form of profiles include taxonomic, distribution and habitat, conservation, natural history, captive maintenance and an extensive bibliography of the species included and have been prepared by world class specialists. A document establishes the standards followed in the preparation and maintenance of the cichlid catalogue. The site is administered by its creator and editor, Juan Miguel Artigas-Azas, a naturalist, whom is also an aquarist and a nature photographer. In 2008, the American Cichlid Association (ACA) awarded Artigas-Azas the Guy Jordan Retrospective Award, which is the maximum honor that association gives to people who have done extensive contribution to the international cichlid hobby.
William Neil Eschmeyer, also known as Bill Eschmeyer, is an American ichthyologist. He is the founder and developer of the database and reference work Catalog of Fishes, hosted by the California Academy of Sciences and available both on-line and in print.
Askoldia is a monotypic genus of marine ray-finned fishes belonging to the family Stichaeidae, the pricklebacks and shannies. Its only species is Askoldia variegata which is found in the northwestern Pacific Ocean.