At present F. hahni is not diagnosable from
F. oxyrryncha. However, F. hahni is
highly disjunct geographically from F. oxyrryncha
and has, on average, a higher snoutmouth length to
fin lengths; ratio of snoutmouth length to dorsalfin
length 1.06-1.36;ratio of snout-mouth length to anal
fin length 1.3-1.5. Validity of the species will be
tested with the acquisition of large resamples of
adults; until that can be done, the species is considered
valid. When mature, males have a thicker snout and
sports odontodes (hair like appendages), you can run
your hand down this and feel if it is a male as females
do not carry this trait, and also their snout is somewhat
slimmer. Although growing large this is an inoffensive
fish and as such, robust tank mates should be avoided.
Aquarium Care: Water parameters will
need to be at the highest quality to keep this catfish
in good health. Diet: Feed vegetable
food such as algae, cucumber, courgette (zucchini),
spinach, lettuce and peas but will also eat other
foods in the aquarium. Remarks:
The type specimens of F. hahni were destroyed
in World War I (Isbrücker 1978).
Middle Paraná River basin, Argentina and Paraguay.
Type locality: Río Paranà,
ca. 2 km east of Ayolas, 27º24'S, 56º46'W,
Misiones Dept., Paraguay.
Ferraris, C.J. Jr.,
2003. Loricariidae - Loricariinae (Armored catfishes).
p. 330-350. In R.E. Reis, S.O. Kullander and C.J.
Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes
of South and Central America. Porto Alegre EDIPUCRS,
Brasil. Ferraris, C.J. Jr., 2007. Checklist
of catfishes, recent and fossil (Osteichthyes: Siluriformes),
and catalogue of siluriform primary types. Zootaxa
1418:1-628. Froese, R. and D. Pauly. Editors.
2016. FishBase. World Wide Web electronic publication.
www.fishbase.org, ( 01/2016 ). Retzer, M.E. and Page, L. M.; Systematic
of the Stick Catfishes, Farlowella Eigenmann &
Eigenmann (Pisces, Loricariidae) Proceedings of the
Academy of Natural Sciences of Philadelphia, Vol.
147, (1997), pp. 33-88.