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Scaphirhynchus albus, Pallid sturgeon
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Scaphirhynchus albus
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DeCloux, R.
Chondrostei (sturgeons) >
Acipenseriformes
(Sturgeons and paddlefishes) >
Acipenseridae
(Sturgeons) > Scaphirhynchinae
Etymology:
Scaphirhynchus:
Greek, skaphe, -eos = boat + Greek, rhyngchos = snout (Ref.
45335
)
;
albus:
From the word
albus
, meaning white (Ref.
10294
)
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Freshwater; demersal; potamodromous (Ref.
51243
). Subtropical; 44°N - 30°N
North America: nearly restricted to main channels of Missouri River and lower Mississippi River from Montana to Louisiana in USA.
Length at first maturity / Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 200 cm TL male/unsexed; (Ref.
58490
); common length : 81.7 cm TL male/unsexed; (Ref.
12193
); max. published weight: 130.0 kg (Ref.
52332
); max. reported age: 41 years (Ref.
32514
)
Short description
Morphology
|
Morphometrics
Absence of scalelike scutes on belly; bases of outer barbels usually behind bases of inner barbels (Ref.
86798
).
Adults inhabit large, deep, turbid river channels, usually in strong current over firm sand or gravel (Ref.
10294
,
58490
). They feed on aquatic insect immatures, particularly caddisfly larvae, and small fish (Ref.
10294
). Threatened due to over harvesting and habitat loss (Ref.
58490
). No length type given but assumed to be in TL.
Robins, C.R., R.M. Bailey, C.E. Bond, J.R. Brooker, E.A. Lachner, R.N. Lea and W.B. Scott
, 1991. Common and scientific names of fishes from the United States and Canada. Am. Fish. Soc. Spec. Publ. (20):183 p. (Ref.
3814
)
IUCN Red List Status (Ref.
130435
)
Critically Endangered (CR)
(A2bcde); Date assessed:
08 December 2020
CITES
Appendix II:
International trade monitored
Not Evaluated
Threat to humans
Harmless
Human uses
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Estimates based on models
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.6250 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00407 (0.00149 - 0.01114), b=3.16 (2.92 - 3.40), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 3.9 ±0.63 se; based on food items.
Generation time: 16.8 ( na - na) years. Estimated as median ln(3)/K based on 2
growth studies.
Resilience (Ref.
120179
): Low, minimum population doubling time 4.5 - 14 years (tm=5-15; Fec=170,000, tmax=41(based on 1 specimen only)).
Fishing Vulnerability (Ref.
59153
): High to very high vulnerability (67 of 100).
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- 20 July 2016
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