rugosus (Bleeker, 1847)
The month of December 2012 welcomes back
again, Asian Catfish expert Adrian Taylor of the Catfish Study
Group and webmaster of asiancatfish.com, to
look at an Asian catfish of the Akysidae family
which is funnily enough the very first family and species shown
in the ScotCat Photo Gallery. Now over to Adrian for his take
on this species.
crochordonichthys catfishes are members of the family
Akysidae and although they grow considerably larger in both length
and girth than either the genera Akysis and Parakysis,
they do not seem to grow as large as some of the Breitensteinia
species, which are also members of the Asian catfish family Akysidae.
Acrochordonichthys species along
with Breitensteinia are often referred to as ‘Asian
Banjo Catfish’ due in part to their similarity in body shape,
which they share with their South American Aspredinidae cousins.
are very varied in appearance, not only do they vary from locality
to locality in colouration, but from specimen to specimen, due
to these type of factors and others they have from time to time
been erroneously identified as a new and different species entirely.
Acrochordonichthys rugosus is
an ambush predator of some 120mm in length (SL) and one that prefers
hiding under submerged logs, branches and rocks and apart from
coming out to feed they do very little else, with the usual knock-on
effect that after some time they tend to get forgotten about when
housed in a mid-sized community tank. In the wild A. rugosus
feed predominately on shrimp, small Balitorid loaches and
small catfish of the genera Glyptothorax. It is also
likely that at times other fish are consumed as and when the opportunity
arises. So it is advisable that these catfish should be housed
in a species only tank or with suitable tank mates that are too
large for them to be considered a food source.
An aquarium having a substrate of sand and gravel interspersed
with pieces of bog wood and rocks, along with a good filtration
system, aquarium water pH with a range of 6.7 to 7.2 a temperature
range of 18-24°C
(63-75°F) and a robust
water changing regime would make a suitable habitat into which
one can comfortably keep these Asian banjo’s.
Like all members of the family Akysidae,
Acrochordonichthys species have numerous small nodule like
growths called granulations running along the length of the body
in parallel rows and which also cover the head profusely.
Generally, A. rugosus has a brown
coloured head and body, with the head being interspersed with
small dots and blotches of a darker brown and a light brown saddle
that runs the length of the adipose ridge and fin, some specimens
have been found with light brown almost tan coloured spots and
patches; and yet in some specimens these colourations and markings
are reversed. (As reported by H.H. Ng and P.K.L Ng, in their revision
of the Ayksid genus Acrochordonichthys, 2000).
These catfish should be housed in a species
only tank or with suitable tank mates that are too large for them
to be considered a food source.
Feeding A. rugosus can be a tad
irksome as they tend not to feed upon commercially prepared food
like granules and tablets, and therefore live foods such as adult
brine shrimp, bloodworms, white worms and earthworms should be
offered, although as a ambush predator feeding every day is not
essential as it is likely that at times in the wild they may have
to wait a day or two before a potential meal comes within ‘ambush’
Greek, akros = summit, topmost + Greek, chorda = nervous
line + Greek, ichthys = fish.
Fleshy finlike projection without rays, behind the rayed
Top image ©
Adrian Taylor @
Bottom image: ©