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Pseudoscaphirhynchus hermanni, Dwarf sturgeon
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Pseudoscaphirhynchus hermanni
Female picture by
Salnikov, V.B.
Chondrostei (sturgeons) >
Acipenseriformes
(Sturgeons and paddlefishes) >
Acipenseridae
(Sturgeons) > Acipenserinae
Etymology:
Pseudoscaphirhynchus:
Greek, pseudes = false + Greek, skaphe = boat + Greek, rhyngchos = snout (Ref.
45335
)
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Freshwater; brackish; demersal; potamodromous (Ref.
51243
). Temperate
Former USSR and Asia: Endemic to the basin of Amu Dariya and Sir Dariya rivers. Registered in the 1984 USSR Red Book; 1985 Turkmen SSR Red Data Book; 1996 IUCN Red List (Ref.
35930
).
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 27.5 cm TL male/unsexed; (Ref.
35930
); max. published weight: 50.50 g (Ref.
35930
); max. reported age: 6 years (Ref.
35930
)
A rare and endangered species; smallest sturgeon; sensitive to chemicals in the water Ref. 35930).
Life cycle and mating behavior
Maturity
|
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|
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|
Eggs
|
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|
Larvae
Robins, C.R., R.M. Bailey, C.E. Bond, J.R. Brooker, E.A. Lachner, R.N. Lea and W.B. Scott
, 1991. World fishes important to North Americans. Exclusive of species from the continental waters of the United States and Canada. Am. Fish. Soc. Spec. Publ. (21):243 p. (Ref.
4537
)
IUCN Red List Status (Ref.
130435
)
Critically Endangered (CR)
(A2c); Date assessed:
14 September 2019
CITES
Appendix II:
International trade monitored
Appendix II:
Migratory species conserved through agreements
Threat to humans
Harmless
Human uses
Fisheries: of no interest
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Zoological Record
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=0.00331 (0.00148 - 0.00739), b=3.16 (2.98 - 3.34), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 3.2 ±0.5 se; based on size and trophs of closest relatives
Resilience (Ref.
120179
): Medium, minimum population doubling time 1.4 - 4.4 years (tmax=6).
Fishing Vulnerability (Ref.
59153
): Low vulnerability (18 of 100).
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