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Catfish (or catfishes; order Siluriformes / s ɪ ˈ lj ʊər ɪ f ɔːr m iː z / or Nematognathi) are a diverse group of ray-finned fish.Named for their prominent barbels, which resemble a cat's whiskers, catfish range in size and behavior from the three largest species alive, the Mekong giant catfish from Southeast Asia, the wels catfish of Eurasia, and the piraíba of South America, to ...
Many species of Loricariidae, a family of catfish, have a modified iris called an omega iris. The top part of the iris descends to form a loop which can expand and contract called an iris operculum; when light levels are high, the pupil reduces in diameter and the loop expands to cover the center of the pupil giving rise to a crescent shaped ...
Clarias cavernicola. The cave catfish[2] (Clarias cavernicola) [3] is a critically endangered species of airbreathing catfish. [4] This cavefish is only known to live in the Aigamas cave, Otjozondjupa region, Namibia. [5][6] It has also been reported from the nearby Dragon's Breath Cave. [7] The golden cave catfish lack pigmentation and are up ...
Asterophysus batrachus, the gulper catfish or ogre catfish, is a species of catfish (order Siluriformes) of the family Auchenipteridae. It is native to the Rio Negro and Orinoco basins in Brazil, Colombia and Venezuela, [1][2] where mostly found in slow-moving waters with many submerged structures. [3] It is currently the only recognized ...
Pseudoplatystoma is a genus of several South American catfish species of family Pimelodidae.The species are known by a number of different common names.They typically inhabit major rivers where they prefer the main channels and tend to stay at maximum depth, but some species can also be seen in lakes, flooded forests, and other freshwater habitats.
The three stripe corydoras ( Corydoras trilineatus ), leopard catfish, false julii corydoras, or three line catfish is a tropical freshwater fish belonging to the subfamily Corydoradinae of the family Callichthyidae. It originates in inland waters in South America, and is found in the central Amazon River basin in Brazil and Colombia, Peruvian ...
Vision is an important sensory system for most species of fish. Fish eyes are similar to those of terrestrial vertebrates like birds and mammals, but have a more spherical lens. Their retinas generally have both rod cells and cone cells (for scotopic and photopic vision), and most species have colour vision.
Mochokidae. Genus: Synodontis. Species: S. nigriventris. Binomial name. Synodontis nigriventris. David, 1936. Synodontis nigriventris, the blotched upside-down catfish, is a species of upside-down catfish native to the Congo Basin of Cameroon, the Democratic Republic of the Congo and the Republic of the Congo.