The dominant fish families – at least in parts of the river – are Cyprinidae ( carp / cyprinids, such as Labeo simpsoni ), Mormyridae ( elephantfishes ), Alestidae ( African tetras ), Mochokidae ( squeaker catfishes ), and Cichlidae ( cichlids ).

Candirus are hematophagous and parasitize the gills of larger Amazonian fishes, especially catfishes of the family Pimelodidae ( Siluriformes ).

Their closest living relatives are the Characiformes ( characins and allies ), the Gymnotiformes ( electric eel and American knifefishes ) and the Siluriformes ( catfishes ).

Inhabiting deep pools, lakes, and large slow-moving rivers, flathead catfish are popular among anglers ; their flesh is widely regarded as the tastiest of the catfishes.

Most fish endemic to the area are catfishes, including the mountain catfish, L. brieni, Leptoglanis mandevillei, L. bouilloni and Atopochilus chabanaudi, an upside-down catfish.

Airbreathing catfishes are fishes comprising the family Clariidae of order Siluriformes.

The Mochokidae are a family of catfishes ( order Siluriformes ) that are known as the squeakers and upside-down catfish.

Many fish such as sharks, rays and catfishes can detect electric fields, and are thus electroreceptive, but as they cannot generate an electric field they are not classified as electric fish.

Typical examples are the electric eel ( Electrophorus electricus ; not a true eel but a knifefish ), the electric catfishes ( family Malapteruridae ), and electric rays ( order Torpediniformes ).

The driftwood catfishes are catfishes of the family Auchenipteridae.

Driftwood catfishes are nocturnal.

Though the family includes three genera of blind, subterranean, and troglobitic catfishes, Trogloglanis, Satan, and Prietella, none of these three genera are closely related.

Members of the family Loricariidae are commonly referred to as suckermouth armoured catfishes, armoured catfish, ' plecos ' or simply ' plecs '; a shortened form of the species name plecostomus.

Unlike most catfishes which are nocturnal, Corydoras species are active during the daytime.

These catfishes are native to the Indian Ocean and western Pacific from Japan to Australia and Fiji.

Otocinclus is a genus of armored catfishes native to South America which are commonly called " dwarf suckers " or " otos ".

Like many other catfishes, females are larger than males in this species.

catfishes are referred to as cream dory.

The species in this genus are the most well-known of the parasitic catfishes also known as candiru, known for their alleged habit of entering the human urethra.

If kept with significantly larger but non aggressive fish, such as geophagus cichlids, large synodntis catfishes, or larger gouramis, they are usually submissive and do not act nearly as aggressive as if they are the dominant species in the aquarium.

Callichthyidae is a family of catfishes ( order Siluriformes ), called armored catfishes due to the two rows of bony plates ( or scutes ) running down the length of the body.

The genera Trogoglanis, Satan, and Prietella include four species of blind catfishes.

Most true loaches do not have true scales, and like many other Cypriniformes or catfishes, they have barbels at their mouths ( usually 3-6 pairs ).

It prefers small slow-moving fishes, and those with long and tapering shapes, such as mormyrids, catfishes, and cichlids.

This suprabranchial organ, or labyrinth organ, allows some species the capability of travelling short distances on land (' walking catfishes ').

Malapteruridae is the only group of catfish with a well-developed electrogenic organ ; however, electroreceptive systems are widespread in catfishes.

Some of these catfishes can inflict painful wounds ; stings from Plotosus lineatus may result in death.

Freshwater catfishes from those rivers migrated and mated to exchange their genetic materials about 10, 000 years ago.

Freshwater catfishes from those rivers migrated and mated to exchange their genetic materials about 10, 000 years ago.

Venom can also be found in some fish, such as the cartilaginous fishes – stingrays, sharks, and chimaeras – and the teleost fishes including monognathus eels, catfishes, stonefishes and waspfishes, scorpionfishes and lionfishes, gurnards, rabbitfishes, surgeonfishes, scats, stargazers, weever, swarmfish.

The broadened coverage allows more instances of conventional fishes such as sturgeons and catfishes, left off Coleman's list.

Despite its name, the electric eel is not closely related to true eels ( Anguilliformes ) but is a member of the Neotropical knifefishes ( Gymnotiformes ), more closely related to catfishes.

It also suggests an earlier differentiation of loricarioids in comparison to other catfishes, or a lack of older fossils of other Neotropical groups.

It is absent in many fish families, but is found in Salmonidae, characins and catfishes.

While electroreception and the ampullae of Lorenzini is present in all other groups of fish, with the exception of hagfish, Neopterygii has lost this sense, even if it has later been re-evolved within Gymnotiformes and catfishes, who possess nonhomologous teleost ampullae.

The current curator, John Lundberg, an expert in catfishes, pioneered deep channel collecting in large tropical rivers and is the lead author of a seminal scientific paper on the biological and geographic history of the Amazon River Basin.

Loricariid catfishes have evolved several modifications of the digestive tract that function as accessory respiratory organs or hydrostatic organs.

Mercer's lyrics are characterized by an unerring ear for rhythmic nuances, a puckish sense of humor expressed in language with a colloquial flair.

The model of this paper considers an industry which is not characterized by vigorous price competition, but which is so basic that its wage-price policies are held in check by continuous critical public scrutiny.

In another study chromium-substituted aluminum oxyhydroxides and related species, prepared homogeneously by high-temperature hydrolysis, are being characterized and investigated spectrally in the ultraviolet region with a view to identification and semiquantitative estimation of the phases formed under varying preparative conditions.

In practical terms, however, since most of us are spontaneously self-centered, Buddhism encourages us to focus love and compassion on others, and thus can be characterized as " altruistic.

The style is characterized by specific rhythms and of Qacidate ( Popular poems ) in Arabic dialect that are long poems from the Algerian heritage.

This music is characterized by a large technical research and focuses mainly on twelve long Noubate " series ", its main instruments are the mandolin, violin, lute, guitar, zither, flute and piano.

Amoeboids are single-celled life-forms characterized by an irregular shape.

Decoration is characterized by fine hatching, and contrasting colors are produced by the use of mineral-based paint on a chalky background.

For example, in modern Western cultures, there are alternative styles of clothing that characterized older and younger generations.

While there are ancient relations between the Indian Vedas and the Iranian Avesta, the two main families of the Indo-Iranian philosophical traditions were characterized by fundamental differences in their implications for the human being's position in society and their view on the role of man in the universe.

They are characterized by seeing the world through an agricultural lens.

The shells of abalones have a low and open spiral structure, and are characterized by several open respiratory pores in a row near the shell's outer edge.

Tolstoy defined art ( and by no coincidence also characterized its value ) as the following: " Art is a human activity consisting in this, that one man consciously, by means of certain external signs, hands on to others feelings he has lived through, and that other people are infected by these feelings and also experience them.

The United States ' regional cuisines are characterized by its extreme diversity and style with each region having its own distinctive cuisine.

Compared with most other classes of natural compounds, alkaloids are characterized by a great structural diversity and there is no uniform classification of alkaloids.

Whereas other nations have soothsayers and diviners who attempt to discover the will of their gods, according to Heschel the Hebrew prophets are characterized by their experience of what he calls theotropism — God turning towards humanity.

Thus, ocular albinism occurs more frequently in males as they have a single X and Y chromosome, unlike females, whose genetics are characterized by two X chromosomes.

As defined by Arrhenius, acid – base reactions are characterized by Arrhenius acids, which dissociate in aqueous solution to form hydrogen ions (), and Arrhenius bases, which form hydroxide () ions.

* Long bones are characterized by a shaft, the diaphysis, that is much longer than it is wide.

Unlike bioweapons, these midspectrum agents do not reproduce in their host and are typically characterized by shorter incubation periods.

Although it's increasingly common for couples – particularly younger couples – to have " power neutral " relationships and / or play styles, activities and relationships within a BDSM context are often characterized by the participants ' taking on complementary, but unequal roles ; thus, the idea of informed consent of both the partners becomes essential.

In general, Bayesian methods are characterized by the following concepts and procedures:

Users are also widely characterized as the class of people that use a system without complete technical expertise required to understand the system fully.

The Canoidea superfamily ( or Caniformia suborder ) – Canidae ( wolves, dogs and foxes ), Mephitidae ( skunks and stink badgers ), Mustelidae ( weasels, badgers, and otters ), Procyonidae ( raccoons ), Ursidae ( bears ), Otariidae ( eared seals ), Odobenidae ( walrus ), and Phocidae ( earless seals ) ( the last three families formerly classified in the suborder Pinnipedia ) and the extinct family Amphicyonidae ( bear-dogs ) – are characterized by having nonchambered or partially chambered auditory bullae, nonretractable claws, and a well-developed baculum.

Could one not say that, in the fortuitous combinations of the productions of nature, as there must be some characterized by a certain relation of fitness which are able to subsist, it is not to be wondered at that this fitness is present in all the species that are currently in existence?