month of April 2011 heralds the return of aquarist
and author Chris Ralph to
lend his experience in keeping one of the more popular
species of the Corydoradinae, Corydoras duplicareus..
duplicareus belongs to the family Callichthyidae
or armoured catfishes from South America; namely Brazil
the Rio Puranga 8km north of the Nouba Ouba, prior
to where it joins a small tributary of the Upper Rio
duplicareus is not very common amongst aquarium
imports from South America, but is well worth looking
out for in my opinion. Over the last few years I have
had the opportunity to keep this rather attractive
species in my home aquaria. In its natural habitat
Corydoras duplicareus will be found forming
shoals amongst Corydoras
adolfoi. This catfish
is described as being very similar in appearance to
Corydoras adolfoi which has a much thinner
black band running from the base of the dorsal fin
to the caudal fin forming a point and its pectoral
fin spine is not serrated as in C. duplicareus.
This species prefers
to be kept in water which has a pH in the range of
6.0-7.2 and hardness in the range of 2-20°dGH.
It is ideally suited to temperatures in the range
of 23-25ºC or 73-77°F.
I would suggest
a minimum size of 24” x 15” X 12”
for a small shoal of these fascinating little catfish.
I would suggest good quality aquarium sand such as
BD Aquarium Sand, or very smooth rounded gravel as
the preferred substrate when keeping these catfish.
The aquarium should provide some shelter in the form
of rocks or bogwood along with some aquatic plants.
As with all other species of fish, water quality and
general husbandry is very important, and I would recommend
that a minimum of 25% water is changed on a weekly
to fortnightly basis.
duplicareusis placed in Lineage
9, the "short-snouted" species with the
designated type species: C. punctatus.
A revision in the future would constitute the resurrection
of the genus name Hoplosopma (Agassiz,
Rio poranga, 8 kilometres north of the Nobua oba,
prior to where it joins a small tributary of
the Upper Rio Negro.
Male: 5.0cm (2ins) Female:
The body shape of Corydoras
duplicareus is described as being typical triangular
Corydoras shaped. Described as having a slightly
elongated body with a rounded snout. The caudal fin
is described as being forked.
The base colour of the body
and head is described as being light tan. The ventrolateral
scutes are described as being light tan in colour
interspersed with gold coloured speckling mainly
around the lateral line. The dorsolateral scutes
are described as being dark black in colour, with
the colouration extending from the base of the dorsal
fin to the caudal fin (this black band can vary
in depth and is documented as varying from 4-6mm).
The dorsal fin is described as having a smattering
of black colouration at its base; the remaining
fins are described as being light tan in colour.
This catfish has a dark coloured mask from the top
of the head extending through the eyes towards the
operculum. The tip of the snout in front of the
eye mask is described as being light gold in colour.
This catfish is described as having a gold coloured
patch between the rear of the eye mask and the base
of the dorsal fin.
Care & Compatibility
Wherever possible I would
recommend that the aquarist keep these catfish in
a community aquarium in small groups of six or more,
but as the absolute minimum I would suggest three
specimens assuming that they are available in these
numbers. In their natural habitat Corydoras duplicareus
would be found in relatively large shoals.
There are documented
records of Corydoras duplicareus having been
spawned in aquaria. See article.
As with most other species
of catfish the males tend to be more slender than the
females. The females are described as being larger and
plumper especially when ready to spawn. The males are
described as being more strikingly coloured than the
As with all the other catfish
that I have had the pleasure to keep over the years,
Corydoras duplicareus readily accepts a mixed
and varied diet which includes granular foods, frozen
bloodworm and a good quality flake.
Defined as a second dorsal fin which in the case of
Corydoras consists of fatty tissue with a single
spine supporting a thin membrane. Anal fin:Defined
as the medial fin immediately posterior to the anus.
Caudal fin: Defined as the tail fin.
Caudal peduncle: Defined as the usually
narrowing posterior part of the body between the anal
and caudal fins. Dorsal: Defined as being top or above. Dorsal fin: Defined as the medial fin
on top of the back. Operculum: Defined as the large bone
forming the gill cover. Pectoral fins: Defined as paired lateral
fins. Scute: Defined as a bony plate. Ventral: Defined as bottom, below or
underneath. Ventral fins: Defined as the paired
fins between the pectoral and anal fins.
skin,(helmeted Doras) cuirass. duplicareus: from the Latin
duplicare meaning to duplicate, alluding to the similar
colour pattern shared with Corydoras adolfoi.
Markos & Taylor, Martin (2011). Evolution,
ecology and taxonomy of the Corydoradinae revisited.
Fuller, I.A.M. & Evers, H-G: 2005 Identifying
Corydoradinae Catfish 384 p.