his
Corydoras/Osteogaster speciesis
usually the first one kept by aquarists and subsequently
leads them into the fantastic world of catfishes.
Many new exiting colour varieties are beginning to
appear in the hobby mostly from Venezuela and Peru,
these include the Peru Green-Stripe, the
Peru Gold-Stripe and the Peru Gold-Shoulder
Red, there is also a black variety, it may be
in the future that these fish will be reclassified
into a new species, only time will tell.
-
Osteogaster
aenea
In the early days
of the modern hobby this Cory along with Hoplisoma
paleatum, the 'Peppered Cory' were the main diet
of catfish enthusiasts as there was not much call
for importing exotic species as keeping catfish was
not as popular as it is today, and with the world
opening up with faster trade routes and the growing
popularity for catfish, and indeed other exotic species,
we have today hobbyists themselves who go and collect
these species and bring them back to their own tanks.
This Corydoras/Osteogaster
is abundant in the hobby mainly due to their breeding
in fish farms in the Far East and I think that this
has given us a poor representation of aenea
in the aquatic shops today. You can still find good
specimens but you will have to shop around and of
course fish auctions can throw up a surprise or two.
The albino variety is also very popular with first
time hobbyists. This is probably why the serious Cory
enthusiast tends to overlook this species which has
been with us for so long.
If starting off
with this species buy at least half-a-dozen as with
most Cory's they are happier in their own company,
and with the comparatively low price of aeneus
(apart from the new varieties) it would certainly
not break the bank, and you could end up of course
with at least a pair of these hardy Cory's.
Breeding is comparatively
easy with cool water changes that lowers the temperature,
triggering them off. Feed a good balanced diet
making sure that they get their full quota of food
if kept in a community tank. A good quality flake
food provides all the essential vitamins that they
need with extra feedings of frozen bloodworm, white
worm (sparingly) and tablet food. The new varieties
mentioned earlier are not quite so easy to breed and
need a little more work. In the two following pictures
you can see male and female albino with the eggs laid
high up on the glass front in the full flow of an
internal filter. The second photo shows the fry against
a one new pence (U.K.sterling).
Below
is a gallery of a few of the new so-called aenea
varieties, just click on the thumbnail to get a larger
image.
Normal
bronze; Photo Credit: C.H.Bishop
Albino;
Photo Credit: Kathy Marshall
Gold Form;
Photo Credit: Adrian Payne
Green Laser;
(CW009) Photo Credit: Adrian Payne
Black
aenea - schultzei;
Photo Credit: Sandy Milne
Make
sure that you keep them in rounded gravel or preferably
on sand as sharp gravel can erode the barbels, making
them virtually useless for breeding, especially on
the females. Even if you do keep your Cory's on rounded
gravel or sand, do keep the substrate clean as a build
up of bacteria there can also harm their delicate
barbels.
As there is so
many so-called varieties of O. aeneus, it
would be better to keep the them apart in case of
hybridisation.
Remarks:
Placed in Lineage 7 alongside other members of the
so called "aeneus group" with the designated
type species: C. eques. A revision in the
future would constitute the resurrection of the genus
name Osteogaster Cope, 1871. As
of the latest update Corydoras aeneus has
now been placed in Lineage 7 and has the new genus
name of Osteogaster and a change to the specific
name to aenea (Dias et al 2024).
Brazil
- Ecuador
- Surinam - Venezuela -
Colombia - Peru - Trinidad - Argentina,
northern. Widely
distributed in South America on the eastern side of
the Andes, from Colombia and Trinidad to La Plata
River basin. Type locality: Island
of Trinidad, West Indies.
Size:
Male: 6.5cm, (2½ins)
Female: 7.5cm. (3ins)
Temp:
20-27°C
(67-81°F)
p.H.
6.5-7.2.
Characteristics
Dorsal 1/7; Anal 1/6-7; 21-23
bony scutes in the upper lateral series, 19-21 in
the lower.
Colouration
Colouration uniform yellow-brown
to delicate reddish-brown with a strong metalic
glint on the sides of the head and body. Sometimes
shining green, sometimes coppery or, in sunlight,
golden. The colouration along the middle of the
flanks is substantially darker.
Aquarium
Care & Compatibility
Will do well in a community
setup with smaller tankmates such as Rasboras and
Tetra's. Do not house with aggressive species or large
Cichlids.
Reproduction
Like to lay their
eggs (300 or more) in the direct flow of a filter
usually high up on the glass where the flow strikes.
Eggs will hatch in 3 to 4 days and will use up their
yolksac after 3 days. I did find that the O. aeneus
'albino' fry are a little more difficult to raise
to adulthood, than some other Cory's, so keep the
water changes up. (See image of spawning sequel with
the eggs high on glass in the flow of internal filter
and the fry in a small plastic holding tank.)
Diet
The fry after 3 days feed on
infusoria then on to microworm, fry flake, then progress
on to Brine Shrimp naupli. Adults can be fed the usual
good quality flake food, frozen bloodworm, tablet
foods, white and grindal worms.
Etymology
Osteogaster:ostéon,
bone; gast, belly, referring to coracoid bones of
Osteogaster eques, which, unlike those of
Gastrodermus elegans, enclose the ventral
region. aenea: Bronze.
References
Angelica
C Dias, Luiz F C Tencatt, Fabio F Roxo, Gabriel de
Souza da Costa Silva, Sérgio A Santos, Marcelo
R Britto, Martin I Taylor, Claudio Oliveira,
Phylogenomic analyses in the complex Neotropical subfamily
Corydoradinae (Siluriformes: Callichthyidae) with
a new classification based on morphological and molecular
data, Zoological Journal of the Linnean Society, 2024;,
zlae053. Sterba's
Freshwater fishes of the World Vol.1 1973.
Photo Credits
Top: Haraldo
Bishop
Bottom: Allan
James @
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