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Alfaro cultratus, Knife livebearer
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Alfaro cultratus
Picture by
Brill, J.
Teleostei (teleosts) >
Cyprinodontiformes
(Rivulines, killifishes and live bearers) >
Poeciliidae
(Poeciliids) > Poeciliinae
Etymology:
Alfaro:
Taken from Anastasio Alfaro zoologist of the Natural Museum of Costa Rica
.
More on author:
Regan
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Freshwater; pelagic; pH range: 6.0 - 8.0; dH range: 5 - 12; non-migratory. Tropical; 24°C - 26°C (Ref.
30491
)
Central America: Costa Rica, Panama and Nicaragua.
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 7.5 cm TL male/unsexed; (Ref.
50894
); 8.0 cm (female)
Inhabits waters of low to moderate velocity, between 0 and 300 m elevation. Lives on creeks of more than 0.5 m deep, in ditches and near shorelines of large rivers. Generally swims in small groups at a depth of 20 cm. Insectivorous, the young eat mainly aquatic insects and the adults feed specifically on terrestrial insects (Ref.
36880
). Found in a rapidly flowing rainforest stream (Ref.
26130
).
Gestation lasts for about 24 days. Produces 10 to 30, rarely more, young. Reaches sexual maturity in about 5 or 6 months.
Rodriguez, C.M.
, 1997. Phylogenetic analysis of the tribe Poeciliini (Cyprinodontiformes: Poeciliidae). Copeia 1997(4):663-679. (Ref.
26855
)
IUCN Red List Status (Ref.
130435
)
Least Concern (LC)
; Date assessed:
06 February 2020
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
= 0.7500 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00891 (0.00451 - 0.01762), b=3.19 (3.02 - 3.36), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245
).
Trophic level (Ref.
69278
): 3.4 ±0.45 se; based on food items.
Resilience (Ref.
120179
): High, minimum population doubling time less than 15 months (tm=0.5).
Fishing Vulnerability (Ref.
59153
): Low vulnerability (10 of 100).
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- 20 July 2016
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