Oxydoras niger
(Valenciennes, 1821)
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In this, the last month of 2005, we welcome
back Chris Ralph a regular contributor to ScotCat and who also
writes for the largest circular fishkeeping magazine in the U.K.,
"Practical Fishkeeping". He is also an author in his
own right with a few books now on the hobby. Without further ado
Chris will explain the doe's and don'ts of keeping one of my own
favourite big cats, Oxydoras niger, the "Mother
of Snails Catfish".
he Mother of Snails Catfish is not
a very commonly seen doradid, although if you have kept one then
it is one that you will not forget in a hurry due to the size
that they can grow to. These catfish are usually offered for sale
as juvenile specimens at around 4” in length. To the unsuspecting
aquarist they have probably taken on more than they bargained
for! This said if you are a genuine enthusiast you would already
know a bit about these fish and their requirements prior to their
purchase. The colour of these fish is basically dark brown to
black, hence their other common name name "Black Doradid".
If you own one of these catfish you will know that feeding time
can be a rather wet experience, even with tight fitting cover
glasses, or in my case an open topped pond! I have lost count
of the number of soakings that I have had over the years! I
purchased my first Mother of Snails Catfish about twenty years
or so ago. The first one that I owned was around 10” long
SL (25cm) and very rapidly outgrew a 72” x 18”x
18” aquarium. I eventually purchased a larger aquarium
72” x 24” x 36” and went on to keep this fish
for a number of years. When the fish died from a bacterial infection
it was almost 28” in length, and would have required an
even larger aquarium before too long. This was really the main
reason behind the construction of the Tropical Pond, although
at present I am not keeping any large catfish. The Mother of
Snails Catfish belongs to the Family Doradidae, all of which
originate from various locations throughout South America.
Sometimes literature refers to the doradids as “Talking
Catfish” due to the fact that they can be heard to make
audible noises, almost as if they are speaking to one another.
There have been no records of these catfish having been successfully
bred under aquarium conditions yet, which is probably just as
well!
One of the main characteristics of the
doradids is the presence of thorn like projections along the side
of the body, which are known as scutes. These scutes are very
sharp, so care should be taken when moving these fish.
Occasionally amongst imports of Oxydoras
niger there are the odd slightly different specimens which
tend to have black coloured fins and a grey coloured body, which
are Pseudodoras holdeni.
A real “Tank buster” if ever there was one. Quite
a character obviously suited to large accommodation especially
if keeping a number of fish together. Peaceful towards other fish
and members of its own kind. Other doradids such as Agamyxis
pectinifrons (Spotted Dora), Platydoras costatus
(Striped Dora), Oscars and any other fish of a compatible size.
Large pieces of bogwood and clean plastic drainpipe of suitable
diameter for them to hide under. Ideally heater guards should
be provided in order for the fish not to burn themselves.
| Sexing |
There are no known external sexual differences.
There are however some thoughts and suggestions that there
may be some differences in the shape of the bony plates
which extend from the head to the edge of the pectoral fins.
It has been suggested that the male has a more pointed plate,
whilst the female has a more rounded plate. There is no
scientific evidence that is available to support this observation.
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| Breeding |
As yet unknown.
Readily accepts all manner of prepared foods. Stinking Sinking
Catfish Pellets are high on the list, alongside floating pellets
and sticks, as well as frozen bloodworm, chopped mussel and earthworms.
| Etymology |
Oxydoras:
Oxys = sharp; doras = cuirass ( helmeted)
niger : Black body colour |
| Reference |
Previously published in the September 2005
edition of Practical Fishkeeping magazine.
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| Photo
Credits |
Danny Blundell
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| Synonyms:
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| Doras niger, Doras humboldti, Pseudodoras
niger, Corydoras edentatus, Rhinodoras niger, Rhinodoras prionomus,
Rhinodoras teffeanus. |
| Common
Name: |
| Mother of Snails Catfish, Ripsaw Catfish &
Black Doradid |
| Family: |
| Doradidae |
| Subfamily: |
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| Distribution: |
| Amazon region, Peru, Brazil, Rio Purus, Rio
Sao Francisco. |
| Size: |
| In excess of 90cm (36ins) |
| Temp: |
| 21-24°C
(70-75°F) |
| pH.: |
| pH 6.0 to 7.8 with up
to 25 dGH hardness |
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