hen we think, talk or discuss about parasitic
or candiru catfishes we think of the worst, with them
entering, probably by mistake, the urethra of mammals
urinating under water and entering gill chambers of
larger catfishes, but actually this little catfish
does not present much of a problem in aquaria as long
as there is guidelines followed.
Adrian Taylor has kept this little catfish and the
following abstract is the response to my questioning.
"I did keep T. Brevis, as they came in as
a contaminant of an import of cardinal tetras from
South America. The retailer that I purchased the fish
from mentioned that he had had them in before in amongst
cardinals but only ever in the ones and two's. I kept
them in a 16ins x 8ins x 8ins with some Aspidoras,
were I never noticed the Aspidoras in an unhealthy
condition or any wounds on them and they seemed quite
happy to feed on live foods such as small bloodworm
and live baby brine. After a couple of months they
were never seen in the tank at feeding or free swimming
as they would bury themselves in the sand. They were
kept in a P.H.of around 6.8, with a temperature of
This is not the
most appealing looking catfish being quite plain in
appearance but never the less so little is known about
this genera and other smaller parasitic catfishes
that in itself would appeal to the quirky world of
Distrbution:South America:Brazil, Amazon River basin.
Formerly Tridensisilis brevis but in the
paper by Datovo A., et al. 2023 they examined specimens
collected near the type-locality of T. brevis
(ZUEC 15118) that fitted the diagnostic characters
originally reported for the species. These specimens
clearly belong to Tridentopsis. Therefore,
all evidence indicate that T. brevis is
a Tridentopsis and, consequently, Tridensimilis
is a monotypic genus containing only T. venezuelae
A., et al 2023).
South America:Brazil: Amazon River basin. Type
locality: Tabatinga (Brazil).
Body short and deep. Head as
broad as long. Mouth broad, inferior. Opercle with
a bunch of six or more spines. Barbels well developed,
the outer one extending to the base of the pectoral,
the inner to the gill-opening. Eye large, nearer end
of opercle than tip of snout. Distance of dorsal fin
from tip of caudal little more than 2cm in length.
Anal fin inserted very little in front of the dorsal
and extending some distance beyond it, its rays decreasing
in height toward the caudal. First pectoral ray greatly
reduced. Caudal emarginate.
Yellowish; blackish dots along
the bases of the fins; a series of blackish dots along
the middle line of the sides, similar spots on the
back. Head with brown dots.
Care & Compatibility
Does not seem to be problematic
in its care. Can be housed with small fish, with probably
cardinal or neon tetras as upper layer fish.
Will take most prepared aquarium
foods such as frozen small frozen bloodworm, live
baby brine shrimp, Daphnia and mosquito larvae.
The median, unpaired, ventrally located fin that lies
behind the anus, usually on the posterior half of
the fish. Caudal fin: The tail. Dorsal fin: The primary rayed fin(s)
on top of the body. Emarginate: Concave; used to describe
the posterior border of a caudal fin which is inwardly
curved; a caudal fin with a slightly concave margin.
Opercle: The bony covering of the
gills of fishes. Pectoral fins: The paired fins just
behind the head.
Greek, tres tria = three + Latin, dens = teeth. –opsis,
appearance, referring to similarity to the closely
related Tridens. brevis: The specific name
of brevis: short, referring to short and
deep body, shorter than Tridens melanops,
its presumed congener at the time.
Taylor Pers. comm. May 2020. Datovo A, Ochoa L, Vita L, Presti P, Ohara
WM, de Pinna MCC. A new genus and species
of miniature tridentine catfish from the Amazon basin
(Siluriformes: Trichomycteridae). Neotrop Ichthyol.
2023; 21(3). Eigenmann, C. H. and R. S. Eigenmann
1889 (18 Aug.) Preliminary notes on South American
Nematognathi. II. Proceedings of the California Academy
of Sciences (Series 2) v. 2: 28-56. Ferraris, C.J. Jr., 2007. Checklist
of catfishes, recent and fossil (Osteichthyes: Siluriformes),
and catalogue of siluriform primary types. Zootaxa
in the News Riehl, R. and H.A. Baensch
Atlas, Band 1.10th edition. Mergus Verlag GmBH, Melle,
Germany. 992 p.