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Astyanax bimaculatus (LINNAEUS, 1758)

Two Spot Astyanax

March 13th, 2012 — 1:21pm

A. bimaculatus is not a popular aquarium fish but is available on occasion exception, most often as a contaminant among shipments of other species.

It’s identity is also in question to an extent with the name currently applied to what is considered to represent a species complex comprising at least four taxa.

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Astyanax mexicanus (DE FILIPPI, 1853)

Blind Cave Tetra

March 13th, 2012 — 1:21pm

While the surface-dwelling form of this species is fairly unremarkable and rarely-seen in the hobby, the blind form is very popular indeed. The two may have diverged as recently as within the last 10,000 years, with the blind form losing its eyes and much of its pigment. This probably happened because the fish needed better development in other sensory areas. Losing unnecessary and energy-consuming aspects of its physiology allowed it to devote more energy to developments such as increased numbers of taste receptors on the head.

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Aphyocharax nattereri (STEINDACHNER, 1882)

Dawn Tetra

March 13th, 2012 — 1:21pm

This species is normally referred to as A. paraguayensis, but that name has been considered a synonym of A. nattereri since 2003.

Confusion remains however, as the type locality for the latter is ‘Villa Bella’, now known as Parintins, a settlement on the main Amazon river channel between Manaus and Santarém and many kilometres away from the majority of confirmed localities.

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Aphyocharax rathbuni EIGENMANN, 1907

Redflank Bloodfin

March 13th, 2012 — 1:21pm

Endemic to the Paraguay, Paraná and Uruguay river drainages in Brazil, Paraguay, Argentina and Uruguay.

The smallest of the three Aphyocharax species seen in the hobby, the redflank is relatively uncommon in the hobby in the aquarium trade.

It is also known as the Green Fire Tetra.

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Aphyocharax anisitsi EIGENMANN & KENNEDY, 1903

Bloodfin Tetra

March 13th, 2012 — 1:21pm

A good beginner’s tetra, as it’s a hardy species that will adapt to a relatively wide range of conditions. In a well-insulated house it can even be kept in an unheated tank, although it won’t be as colourful as when kept in warmer water.

It’s also quite long-lived and captive specimens over ten years old are not unheard of…

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Hyphessobrycon vilmae GÉRY, 1966

March 13th, 2012 — 1:21pm

Choice of décor is not especially critical although it tends to show better colouration when maintained in a well-furnished set-up with live plants and a dark substrate.

A natural-looking arrangement might consist of a soft, sandy substrate with wood roots and bran…

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Hyphessobrycon loretoensis LADIGES, 1938

Loreto Tetra

March 13th, 2012 — 1:21pm

The most recent diagnosis appears to be that of Géry (1977), in which it was separated from other members of the group by the following combination of characters: dorsal-fin insertion at or slightly anterior to mid-body; caudal-fin brick red to orange-red; body depth fits less than 3.6 times in SL; head length fits 3.5-4.0 times in SL; caudal peduncle length u…

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Hyphessobrycon stegemanni GÉRY, 1961

Savanna Tetra

March 13th, 2012 — 1:21pm

In the aquarium hobby the name Hyphessobrycon stegemanni has frequently been misapplied to a species that has been described as Hemigrammus ataktos Marinho, Dagosta, & Birindelli 2014. The reasons for this confusion are presumably that the two occur sympatrically in the rio Tocantins system and both possess a dark lateral stripe on the body.

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Hyphessobrycon haraldschultzi TRAVASSOS, 1960

Crystal Red Tetra

March 13th, 2012 — 1:21pm

This species is occasionally available in the aquarium trade, although usually as bycatch among shipments of other fishes.

It is sometimes traded as H. sp. ‘Araguaia red’, H. sp. ‘Araguaia’ or ‘Schultz’s tetra’.

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Hyphessobrycon bifasciatus ELLIS, 1911

Yellow Tetra

March 13th, 2012 — 1:21pm

Generally peaceful making it an ideal resident of the well-researched community aquarium.

It is perhaps best-maintained alongside similarly-sized characids, gasteropelecids, lebiasinids, smaller callichthyid or loricariid catfishes and non-predatory, medium-sized cichlids.

Try to buy a mixed-sex group of at least 8-10 specimens, incl…

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