to the Doradidae family and is very similar to Acanthodoras
The main differences are the lateral body plates of
the caudal peduncle in A. cataphractus tend to meet
above and below (except the last one), whereas in
A. cataphractus the last four or five pairs are separated.
A. spinosissimus also has a broader and spinier humeral
process. and A. cataphractus also tends to be a more
their natural habitat these catfish are said to be
abundant in the calm waters of swamps and mangroves.
They are most active at night preferring to take refuge
during the day. Not often imported but can sometimes
can be found as a bycatch alongside Platydoras
spinosissimus:dorsal head view
This genera is
the only of the family that has a rounded tail. When
these individuals are caught they will emit sounds
by the movement of their thorny pectorals and secrete
a milky substance from the axillary pore under the
humeral process. This substance is harmful for other
fish and Schomburgk (1841) reports that is bitter
to the taste.
Cataphractus americanus, Doras blochii, D.brunnescens,
D.castaneoventris, Callichthys asper
Amazon and Essequibo River basins. Type locality:Upper Essequibo [Guyana].
15.0cm. (6ins) (standard length
– this is the measurement of the fish from the
tip of the snout to the base of the caudal peduncle).
Head more wide that long.
The body is completely assembled
with spines that are fairly deep, they cover more
than half of the body and are almost in contact in
the dorsal area.
A thin yellow band all the
long flank and another more faint, from the eyes
to the start of the dorsal fin. All fins have markings
without a specific pattern.
Care & Compatibility
These catfish are ideally
suited to being kept in a community aquarium environment
with other medium to large species of fish such as
Bleeding Heart Tetras, Emperor Tetras and other catfish.
The main thing to remember is that these catfish have
quite a large mouth and are capable of eating any
fish small enough to fit inside. Wherever possible
it is recommended that the aquarist keep these catfish
in small groups of four to six specimens, assuming
that they are available in these numbers; failing
this theyare quite happy to shoal with other
members of the family Doradidae. In their natural
habitat they would be found in very large shoals.
The close cousin
Acanthodoras cataphractus is documented as having
been spawned in aquaria. Both parents were observed
digging a depression in the substrate into which the
eggs were deposited. The eggs were guarded by both
fish. The eggs hatched after 4-5 days although unfortunately
the young did not survive beyond the fry stage of
development. This should
also be the case with Acanthodoras spinosissimus.
Omnivorous and readily accepts
a mixed and varied diet which they search through
the substrate. Catfish pellets, good quality flake
foods, granular foods, cultured whiteworm, earthworms,
aquatic snails which they relish and frozen foods
such as bloodworm to name but a few.
Humeral process: Bony
extension of the pectoral girdle. Dorsal: The primary rayed fin(s)
on top of the body. Pectoral: The paired fins just behind
the head. Pectoral girdle:
The bony or cartilaginous skeletal arch supporting
the pectoral fins.
from the Greek acantha = thorns, and doras, meaning
skin; in reference to the spines on the bony scutes
along the lateral line. spinosissimus:The most spiny.
W.E. 1989 An atlas
of freshwater and marine catfishes. A preliminary survey
of the Siluriformes. T.F.H. Publications, Inc., Neptune
City, New Jersey (USA). 784 p. Conservación Internacional;
seris de Guías Tropicales De Campo. Pecos del
medio Amazonas Región de Leticia. 546 p. Ferraris, C.J. Jr., 2007. Checklist
of catfishes, recent and fossil (Osteichthyes: Siluriformes),
and catalogue of siluriform primary types. Zootaxa 1418:1-628. Grant, Steven: