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The eyes are positioned on the top of the head, and the fish floats at the water surface with only the lower half of each eye underwater. The two halves are divided by a band of tissue and the eye has two pupils, connected by part of the iris. The upper half of the eye is adapted for vision in air, the lower half for vision in water. [35]
The family Pimelodidae has undergone much revision. Currently, it contains about 30 genera and about 90 recognized and known but unnamed species. [2] Wikipedia lists 109 species in this family. The low-eye catfish (previously family Hypophthalmidae), and thus the genus Hypophthalmus, which contains four species, was reclassified with the ...
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 ...
The flathead catfish is olive colored on its sides and dorsum, with a white to yellow underside. Individuals, particularly young specimens from clearer waters, [6] may be strongly mottled with dark brown to black color. [7] The eyes are small and the lower jaw prominently projects beneath the upper. A premaxillary tooth pad has posterior ...
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.
Fish coloration, a subset of animal coloration, is extremely diverse. Fish across all taxa vary greatly in their coloration through special mechanisms, mainly pigment cells called chromatophores. [1] Fish can have any colors of the visual spectrum on their skin, evolutionarily derived for many reasons. There are three factors to coloration ...
Clarias cavernicola. The cave catfish[2] (Clarias cavernicola) [3] is a critically endangered species of airbreathing catfish. [1] This cavefish is only known to live in the Aigamas cave, Otjozondjupa region, Namibia. [4][2] It has also been reported from the nearby Dragon's Breath Cave. [5] The golden cave catfish lack pigmentation and are up ...
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.