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Hemiodus ternetzi

Classification

Hemiodontidae

Distribution

Known only from the Rio Tocantins basin, Brazil.

Habitat

Inhabits floodplain rivers and lakes.

Maximum Standard Length

4.2″ (10.5cm).

Aquarium SizeTop ↑

Very active and needs a tank measuring at least 48″ x 12″ x 12″ (120cm x 30cm x 30cm) – 108 litres.

Maintenance

A biotope setup would consist, very simply, of a layer of a couple of inches of inert sand as substrate, with perhaps some driftwood branches and twisted roots scattered around. Some floating vegetation will help to make it less skittish, though, and it’s equally at home in a fully planted setup. In either case, the water should be very well-oxygenated, and make sure the tank has a well-fitting cover as it can leap surprising distances. It’s sensitive to poor water conditions, so tank maintenance must be stringent.

Water Conditions

Temperature: 73-81°F (23-27°C)

pH: 6.0-7.0

Hardness: 3-12°H

Diet

Unfussy, and will accept most live, frozen and dried foods. Try to make sure it receives some greenstuffs in its diet, as it’s reported to feed quite heavily on plant matter in nature.

Behaviour and CompatibilityTop ↑

Very peaceful but it can intimidate much smaller or more quiet species with its activity and size. It makes an ideal shoaling species for the larger Amazon biotope setup, where it can be combined with similarly-sized characins, cichlids such as Geophagus, Satanoperca and Heros, catfish and Loricariids. It’s a shoaling species by nature and should always be kept in a group.

Sexual Dimorphism

Unknown. Mature females are likely to be rounder-bellied than males.

Reproduction

Not thought to have been bred in the hobby. It’s probably an egg-scatterer.

NotesTop ↑

Hemiodus species can be a very skittish when first introduced to the aquarium, but usually settle down over time, especially if a large number are being kept together. All of them look superficially similar, but can be distinguished by differences in patterning. None are particularly common in the hobby. H. ternetzi can be identified by the fact that the black lateral stripe extends to behind the eye, and the dorsal fin has no pigmentation.

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