e
stay on the South American continent for this months
(July 2004) factsheet and to a long standing member
of the Auchenipteridaebfamily,
the "Midnight Catfish", Auchenipterichthys
coracoideus.
Auchenipterichthys
coracoideus
This "Driftwood
catfish" has been around the hobby for many years,
and with a few other cats from other Genera, was one
of the first uncommon catfish you could find in your
LFS and would be the first member of the Auchenipteridae
family that many catfish enthusiasts would encounter.
I still remember fondly of finding them in a shop
in the early eighties on one of my catfish hunting
day trips and getting quite excited with my purchases.
In these days of course this catfish was known as
Auchenipterichthys thoracatus which we now
know as a completely different fish altogether, they
come from the waters of the Amazon River basin and
the Araguaia River in the Tocantins basin while Auchenipterichthys
thoracatus come from the upperMadeira
River basin (see update below).
The "Midnight
Catfish" received its common name due to its
background colour of blue-grey with its vertical rows
of tiny white specs adorning the foreground, hence
the fish resembling the night sky. The other common
name of the Zamora catfish stems from the catching
locality around the Zamora region of Peru and is caught
in fairly large numbers.
A tank setup for
this species would entail a minimum size of 36x12x15ins
(92x30x38cm) with plenty of hiding places with a temperature
around the 23-25°c (73-77°f.) mark.
Filtration could be by external
or internal filters.
You don't need to provide too strong a current in
your aquarium as this would unnerve this secretive
fish and also not too bright aquarium lighting would
benefit this cat also. A parting shot here is the
fish you would include with your "Midnight Catfish",
try to keep away from small tetra-like fish as they
will soon disappear at night and also aggressive fish
such as the larger Cichlids which would harass this
catfish and stop it getting any food.
Auchenipterichthys
coracoideus has
a very shark-like appearance with its black tip to
the dorsal and when you do catch it out swimming it
is very graceful, darting in and out of the tank decorations,
and is well worth seeing for the first time. It can
be quite a secretive fish, only coming out at lights
out, but in time when it settles in to your aquarium
you may start to see it on the odd occasion during
the day looking for food, and even going to the surface
of the water for any tit-bits.
To sex male from
female is common to the Auchenipteridae
family. Juveniles are
hard to sex but as they mature the males develop a
black hooked extension to the anal fin which resembles
the gonopodium of Livebearers of the Goodiae family.
There is an other
member of this genus, Auchenipterichthys
longimanuswhich
looks alike but sports black spots in place of the
white of Auchenipterichthys coracoideus.
Update: As from
2005 this catfish was misidentified and through
the scientific studies carried out by Carl J.
Ferraris Jr., Richard P. Vari, and Sandra J.
Raredon in their paper Catfishes of
the genus Auchenipterichthys (Osteichthyes:
Siluriformes: Auchenipteridae); a revisionary
study, this species is instead Auchenipterichthys
coracoideus. This is an extract from the
named paper.
"The Neotropical
auchenipterid catfish genus Auchenipterichthys
is reviewed and found to include four species.
Auchenipterichthys thoracatus, formerly
considered to be widely distributed throughout
the Amazon River basin, is found to be restricted
to the upper Madeira River basin. The widespread
Amazonian species that had been misidentified
as A. thoracatus is, instead, A.
coracoideus; a species that also occurs
in the upper Essequibo River. Auchenipterichthys
longimanus, the most widely distributed
species of the genus, is found through much
of the Amazon and Orinoco River basins. The
fourth species of the genus, A. punctatus
(and its junior synonym A. dantei),
is found in the upper portions of the Orinoco
and Negro River basins in Venezuela and the
central portions of the Amazon River basin in
Brazil."
Common
Name:
Midnight
Catfish, Zamora Woodcat
Synonyms:
Trachycorystes coracoides
Family:
Auchenipteridae
Subfamily:
-
Distribution:
South America:
Tocantins
River, central and upper portions of Amazon River,
and Essequibo River basins.
Size:
13.5cm. (5¼ins)
Temp:
23-25°c (73-77°f.)
p.H.
6.5-7.2.
Characteristics
D; 1-6, Shark-like body appearance,
large eyes, deep caudal peduncle with truncate to
keel shaped caudal fin. Large
anal fin.
Colouration
Blue-grey body colouration
with small white spots. Black tip to dorsal fin.
Pectoral and dorsal spines with black edging. Anal
fin with black edging. When in good condition these
fish can show a yellow colouration in the caudal
fin band.
Aquarium
Care & Compatibility
Good community catfish with
normal sized patrons but not to be trusted with small
Tetras for instance, which will be picked of at night
on its twilight patrols.
Reproduction
This family practice
internal fertilization with the female depositing
the fertilized eggs on aquatic vegetation with no
care of the eggs shown. An unsuccessful breeding report
states that the male swims behind the female and they
suddenly lock their pectoral, female's adipose and
caudal fin. They speed around the tank and are oblivious
to anything around them.
After this confrontation they break apart and fall
to the aquarium floor where they sit for a couple
hours in a "dazed" condition.
Sexual
differences
In common with
the rest of the Auchenipteridae family
the males possess an elongated and thickened anal
fin, a genital papilla. To sex male from female is
common to the Auchenipteridae
family. Juveniles are
hard to sex but as they mature the males develop a
black hooked extension to the anal fin which resembles
the gonopodium of Livebearers of the Goodiae family.
Diet
Can be fed most aquarium fare
such as good quality flake, white worm, tablet and
pellet foods and frozen foods such as bloodworm.
Better to feed at lights out
until they get accustomed to the daytime feeding regime
when they may very well join in.
Etymology
Auchenipterichthys: From the Greek, auchenos, meaning neck;
pteron, meaning fin; ichthys, meaning fish in reference
to the long cranial shield, giving the appearance
that the dorsal fin originates at the neck region. coracoideus: Like a raven,
black.
References
Carl J.
Ferraris Jr., Richard P. Vari, and Sandra J. Raredon.
Catfishes of the genus Auchenipterichthys (Osteichthyes:
Siluriformes: Auchenipteridae); a revisionary study. Marshall, David;
A Fish for the Midnight Hour ; Fishkeeping Answers
October 1993, p62-63.
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