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Synodontis contractus

Big-nosed Upside-down Catfish

Vinciguerra, 1928

Formerly Synodontis contracta

On this page11 sections
Synodontis contractus
Synodontis contractusHippocampus-Bildarchiv

Quick facts

Length
75mm SL3.0in SL
Tank base
60 × 30cm24 × 12in
Temp
22–27°C72–81°F
pH
6.2–7.2
Hardness
3–15dGH

Difficulty5 of 8 measures

Moderate

More bars, more demanding. Hardiness is not averaged with the rest.

Space
modest tank
Water
mild adjustment
Temp
unfussy
Diet
unknown
Temperament
unknown
Social
shoal
Compatibility
unknown

Hardiness on its own can raise the rating, whatever the measures above say.

Hardiness
survives most mistakes

The big-nosed upside-down catfish, Synodontis contracta, is a small Synodontis from the Democratic Republic of Congo and Republic of Congo. Often confused with S. nigriventris, it is easily told apart by its larger eyes and broad mouth and head, and it spends most of its time swimming inverted. It should be kept in groups of at least three or four, and can be delicate and prone to disease when first imported.

Distribution

Found only in the Democratic Republic of Congo and the Republic of Congo. It occurs in small ponds, backwaters and creeks, often in large numbers.

Habitat

Found only in the Democratic Republic of Congo and the Republic of Congo. It occurs in small ponds, backwaters and creeks, often in large numbers.

Aquarium size

Standard length
75mm SL3.0in SL
Aquarium base
60 × 30cm24 × 12in
Volume
~54litres~14US gal

60 ∗ 30 ∗ 30 cm24 ∗ 12 ∗ 12 in

Maintenance

A dimly lit aquarium with a soft substrate and rocks, pieces of driftwood and twisted roots arranged to form hiding places suits this species. Broad-leaved plants, such as Anubias or Echinodorus and floating vegetation are also recommended, as the fish like to roost under these.

Water conditions

Temperature
22–27°C72–81°F
pH
6.2–7.2
Hardness
3–15dGH

Temperature: 22 – 27 °C72 – 81 °F

pH: 6.2-7.2

Hardness: 3-15 dH

These recommendations come from this profile’s own figures. They contain affiliate links, so we may earn a commission.

Diet

Synodontis are omnivorous and are most unfussy in terms of feeding. Frozen, live and dried foods are all accepted. It also relishes vegetable matter in the form of shelled peas, cucumber etc., which it will rasp at with the teeth in its lower jaw. Unlike most others in the genus, S. contracta will often feed from the surface in its typical inverted style.

Behaviour and compatibility

One of the most gentle members of the genus, S. contracta can be combined with most peaceful species successfully. The most appropriate tankmates include African tetras, dwarf cichlids such as Pelvicachromis or Anomalochromis and small mormyrids. This species should be maintained in groups of at least 3-4 individuals, as this will give them confidence and encourage them to be seen more often.

Sexual dimorphism

Cannot be sexed by the genital papilla technique as it is too small, although the same dimorphism is apparent. It is therefore difficult to sex, although adult females are generally plumper than males.

Reproduction

Has been spawned in aquaria but the eggs did not hatch.

Notes

Often confused with the similar S.nigriventris, this species is imported infrequently. It is easily distinguished from nigriventris by its larger eyes and broad mouth and head. These features give rise to the common name "Big-nosed upside-down catfish". S. contracta spends the majority of its time swimming in an inverted position and this, along with its exaggerated facial features, make it a characterful and interesting addition to the community aquarium. It is also known as the Bug-eyed Squeaker.

One point that should be noted, is that this species can be quite delicate and susceptible to disease when it is first imported. Extra care with regards to water quality should be taken during the acclimatisation period. Once settled, it usually proves quite hardy.

How the name has changed

  1. Renamed from Synodontis contracta to Synodontis contractus.

    2026Eschmeyer's Catalog of Fishes: genera, species, references

Profile completeness19 of 24

79% complete

Also missing: a recorded distribution, etymology.

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