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Atlantic and South-West Indian Oceans; once widespread.
Size / Weight / Age
Maturity: L
m
?
range ? - ? cm
Max length : 760 cm TL male/unsexed; (Ref.
6871
); common length : 550 cm TL male/unsexed; (Ref.
6871
); max. published weight: 350.0 kg (Ref.
3164
)
Diagnosis:
Pristis pectinata
is easily separable from
Pristis perotteti
by the following characters: its first dorsal fin originates about over the origin of its pelvic fins vs. considerably in front of origin of pelvic fins in
P. perotteti
; its caudal fin is much shorter, but broader relative to the length of the fin, with lower lobe only faintly indicated; its rostral teeth are numerous, 23 or more on each side vs. not more than 20 in
P. perotteti
; its saw is relatively somewhat shorter; its second dorsal fin has the posterior margin much less deeply concave; and its pectoral fins are smaller (Ref.
6902
,
81624
).
Pristis pectinata
agrees with
Pristis pristis
in the shape of its caudal fin and in the position of the first dorsal fin relative to the pelvic fins, but it can be separated from
P. pristis
by its more numerous rostral teeth, 23 or more on each side vs. less than 20 (Ref.
6902
,
81624
).
Inshore and intertidal species, but may cross deep water to reach offshore islands; also ascends rivers and can tolerate fresh water (Ref.
9859
). Commonly seen in bays, lagoons, estuaries, and river mouths. Also found in rivers and lakes (Ref.
12951
). Feeds on fishes and shellfishes (Ref.
58784
). Ovoviviparous (Ref.
50449
). Gravid females reportedly carry as many as 20 embryos, which require a year of gestation (Ref.
27549
). Uses its saw to stir the bottom when feeding on bottom invertebrates and to kill pelagic fishes (Ref.
9859
). Utilized as a food fish; oil is used to make medicine, soap and in leather tanning (Ref.
6871
). Adults stuffed for decoration (Ref.
6871
). Reported to be aggressive towards sharks when kept in tanks (Ref.
12951
). This species is currently protected in several areas as populations are under severe threat (Ref.
81624
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Ovoviviparous, with gravid females containing about 15-20 embryos (Ref.
3163
). Embryos feed solely on yolk (Ref.
50449
). Gives birth in shallow bays and estuaries (Ref.
12951
). Size at birth 61 cm (Ref.
12951
).
Preferred temperature (Ref.
123201
): 22.9 - 28, mean 27.1 °C (based on 776 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5234 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00407 (0.00161 - 0.01032), b=3.02 (2.80 - 3.24), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245
).
Trophic level (Ref.
69278
): 4.5 ±0.80 se; based on food items.
Generation time: 32.3 ( 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 (Fec=15).
Fishing Vulnerability (Ref.
59153
): Very high vulnerability (84 of 100).
Price category (Ref.
80766
):
Medium
.
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Page last modified by :
mrius-barile
- 20 July 2016
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