n
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".
The 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".
Oxydoras
niger
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.
Oxydoras
niger
-head view
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!
Common
Name
Mother
of Snails Catfish, Ripsaw Catfish & Black Doradid
South America:
Amazon region, Peru,
Brazil, Rio Purus, Rio Sao Francisco.
Size
In excess of 90.0cm (36ins)
Temp.
21-24°C (70-75°F)
p.H.
6.0-7.8.
Hardness
Up to 25 dGH
Characteristics
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.
Colouration
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 Oxydoras
sifontesi Fernández-Yépez,
1968.
Aquarium
Care & Compatibility
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 armatulus (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.
Reproduction
As yet unknown.
Sexual
Differences
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.
Diet
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.
References
Previously published
in the September 2005 edition of the Practical Fishkeeping
magazine.
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