Distinguished from H.
wilderi by having two weakly-branched
diverticula restricted to each side of anterior chamber
of gas bladder (rarely one extra pair on posterior
chambers) (vs. gas bladder with many well-branched
diverticula along margins of entire bladder); and
gas bladder rounded posteriorly (vs. gas bladder triangular
posteriorly, each posterior chamber extended posteriorly
into a short terminal diverticulum sharing medial
septum with its pair). Hassar gabiru is further
distinguished from H. orestis by having 11th
through 15th, modally 13th, midlateral scute as the
anteriormost with median thorn (vs. 1st through 8th,
modally 3rd), tip of upper caudal-fin lobe not darkened
(vs. usually darkened), body depth at dorsal-fin origin
24.3-33.1%, mean 25.8% SL (vs. 16.8-22.2%, mean 21.1%
L), body depth at anal-fin origin 15.9-20.7%, mean
17.3% SL (vs. 10.0-14.7%, mean 13.1% SL), and caudal
peduncle depth 6.6-8.6%, mean 7.1% SL (vs. 4.3-6.4%,
mean 5.5% SL). Hassar gabiru is distinguished
affinis by having
the distal tip of the first branched dorsal-fin rays
and membranes pale (vs. first branched dorsal-fin
rays and membranes distally darkened); and lateral
diverticula on the gas bladder fingerlike, weakly-branched
in large specimens (vs. rounded, rarely branched in
large specimens). Aquarium Care:
For a large species it is non aggressive and can be
kept with smaller species such as small characins,
dwarf cichlids, small labyrinth species and also other
small catfish such as Corydoras and the smaller
members of the Loracariids. Provide a soft substrate
such as fine sand as they like to sift through this
for edibles and a sharp substrate could cause damage
to its fine feathered barbels. Lone individuals will
not do well in an aquarium setup so a group of three
or more will be more beneficial to the long term health
of this species. A planted aquarium is a must as they
like to hide in the roots more so than having a rock
or wood setup. Diet: Tablet foods,
small live and frozen foods such as worms and Daphnia.
Remarks: Like its congeners,
this species was usually collected in swift water
over sand beaches at night. It has been considered
that specimens of Hassar orestis (= Hassar
gabiru) collected at the Volta Grande rapids
have preference for benthic invertebrates and detritus.
Brazil, Occurs in the middle to upper Xingu river
basin, and is apparently endemic to the Xingu basin
above the raids of Volta Grande, near Altamira.
16.0cm. (6½ins) (Largest
Birindelli, J.O., D.F.
Fayal and W.B. Wosiacki,
2011. Taxonomic revision of thorny catfish genus Hassar
(Siluriformes: Doradidae). Neotrop. Ichthyol. 9(3):515-542. Froese, R. and D. Pauly. Editors.
2018. FishBase. World Wide Web electronic publication.
www.fishbase.org, ( 06/2018 ).