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Roeboides prognathus
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Roeboides prognathus
Picture by
Sazima, I.
Teleostei (teleosts) >
Characiformes
(Characins) >
Characidae
(Characins; tetras) > Characinae
Etymology:
Roeboides:
Latin, rubus, ruber, reddish
.
More on author:
Boulenger
.
Issue
This species is synonym of
Roeboides affinis
(Günther, 1868) in Eschmeyer (CofF ver. May 2011: Ref. 86870) following Lucena (2007: Ref.
75795
). The species page will be removed.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Freshwater; benthopelagic. Subtropical
South America: Paraguay, middle and lower Paraná, and Uruguay River basins.
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 18.5 cm SL male/unsexed; (Ref.
111728
); max. published weight: 76.00 g (Ref.
111728
)
Inhabits inlets and backwater of rivers and slow-flowing streams. Forages mostly at twilight, stalking larger fishes to feed on their scales. Approaches its prey stealthily and usually aims at prey's flank. Its translucent body likely favor this stealthy approach. Strikes at prey mostly with its mouth closed, dislodging the scales with its stout, external and forward directed foremost premaxillary and dentary teeth. These teeth are often worn and sometimes missing, the differential teeth wear indicating right or left-handedness of a given individual (Ref.
28733
). The jarring strike dislodges a few scales which are swallowed immediately if taken in the mouth, or are picked up as they sink. Besides scales, it feeds on aquatic insects. Juveniles up to 3 cm still do not bear the stout external teeth, hence feed mostly on insects and tiny crustaceans (e.g. ostracods) (Ref.
40383
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Lucena, C.A.S. and N.A. Menezes
, 2003. Subfamily Characinae (Characins, tetras). p. 200-208. 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. (Ref.
36811
)
IUCN Red List Status (Ref.
130435
)
Not Evaluated
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
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Zoological Record
Estimates based on models
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01072 (0.00500 - 0.02297), b=3.16 (2.98 - 3.34), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245
).
Trophic level (Ref.
69278
): 4.1 ±0.70 se; based on food items.
Resilience (Ref.
120179
): Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153
): Low vulnerability (13 of 100).
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- 20 July 2016
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