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
ນິເວດວິທະຍາ
; ນ້ຳຈືດ ກ່ຽວກັບ (ຢູ່)ເທິງຊັ້ນພື້ນດິນໃນທະເລເປີດ. Subtropical
South America: Paraguay, middle and lower Paraná, and Uruguay River basins.
ຂະໜາດ / ນ້ຳໜັກ / Age
Maturity: Lm ? range ? - ? cm
Max length : 18.5 cm SL ຕົວຜູ້/ບໍ່ມີເພດ; (Ref. 111728); ນ້ຳໜັກສູງສຸດທີ່ເຄຍຈັດພີມມາ: 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
ການຈະເລີນເຕັມໄວ | ການສືບພັນ | ການວາງໄຂ່ | ໄຂ່ | ຄວາມດົກຂອງໄຂ່ປາ | ຕົວອ່ອນ
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: Version 2024-1)
Threat to humans
Harmless
Human uses
ເຄື່ອງມື
Special reports
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ແຫຼ່ງອີນເຕີເນັດ
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=0.01202 (0.00579 - 0.02498), b=3.18 (3.00 - 3.36), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245).
ຊັ້ນເຂດຮ້ອນ (Ref.
69278): 4.1 ±0.70 se; based on food items.
ຄວາມຢືດຢຸ່ນ (Ref.
120179): ຂະໜາດກາງ, ປະຊາກອນຕຳ່ສຸດທີ່ໃຊ້ເວລາສອງເທົ່າ 1.4 - 4.4 ປີ (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (13 of 100).
