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Pristis clavata, Dwarf sawfish
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Pristis clavata
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Elasmobranchii (sharks and rays) >
Rhinopristiformes
(Shovelnose rays) >
Pristidae
(Sawfishes)
Etymology:
Pristis:
Greek, pristis = saw (Ref.
45335
)
.
More on author:
Garman
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; brackish; demersal; depth range 1 - 20 m (Ref.
116378
). Tropical; 20°N - 25°S, 46°E - 155°E (Ref.
114953
)
Indo-West Pacific: tropical Australia, possibly more widely distributed. A nominal record from the Canary Islands may not be this species, but the sketchily known
Pristis pristis
from the eastern Atlantic is similar and needs comparison to determine if the two species are distinct (Ref.
009859
). India (Bay of Bengal), Indonesia to eastern Australia, isolatted record from Réunion (Ref.
114953
).
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 318 cm TL male/unsexed; (Ref.
116378
); max. reported age: 34 years (Ref.
116378
)
Short description
Morphology
|
Morphometrics
Greenish brown, rarely yellowish; white ventrally; fins paler. Body shark-like, pectoral fins distinct; head flattened, with a blade-like snout bearing 18-22 pairs of lateral teeth; blade broad, not tapering distally. Nostrils broad with large nasal flaps. Rostral teeth slender, with a groove along posterior margins; teeth reaching basal quarter of blade. Skin with denticles.
Demersal in shallow coastal inshore habitats in mangrove swamps and embayments (Ref.
114953
), intertidal species found in estuaries and on tidal mudflats (Ref.
9859
). Ascends brackish areas of rivers (Ref.
9859
). Ovoviviparous (Ref.
50449
). Pupping thought to occur during the tropical wet season (November to March in Australia (Ref.
114953
). Biology little known (Ref.
9859
). Males mature at approximately 260 cm TL, females possibly slightly larger; born at 65 cm TL (Ref.
114953
). Flesh may be good to eat (Ref.
6871
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Ovoviviparous, embryos feed solely on yolk (Ref.
50449
).
Compagno, L.J.V. and P.R. Last
, 1999. Pristidae. Sawfishes. p. 1410-1417. In K.E. Carpenter and V. Niem (eds.) FAO identification guide for fishery purposes. The Living Marine Resources of the Western Central Pacific. FAO, Rome. (Ref.
9859
)
IUCN Red List Status (Ref.
130435
)
Critically Endangered (CR)
(A2cd); Date assessed:
11 March 2022
CITES
Appendix I:
International trade banned
Appendix I & II:
Endangered migratory species conserved through agreements
Threat to humans
Harmless
Human uses
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Estimates based on models
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5234 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00501 (0.00198 - 0.01270), b=3.05 (2.83 - 3.27), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 3.8 ±0.6 se; based on size and trophs of closest relatives
Resilience (Ref.
120179
): Low, minimum population doubling time 4.5 - 14 years (Fec assumed to be <100).
Fishing Vulnerability (Ref.
59153
): Very high vulnerability (90 of 100).
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Page last modified by :
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- 20 July 2016
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