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Scoliodon laticaudus, Spadenose shark : fisheries, bait
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Scoliodon laticaudus
Picture by
Randall, J.E.
Elasmobranchii (sharks and rays) >
Carcharhiniformes
(Ground sharks) >
Carcharhinidae
(Requiem sharks)
Etymology:
Scoliodon:
scolio-
, from
skolios
(Gr.), oblique;
odon
(Gr.), tooth, referring to oblique teeth pointing towards sides of mouth. (
See ETYFish
)
;
laticaudus:
latus
(L.), wide or broad;
cauda
(L.), tail, allusion not explained, perhaps referring to width of upper caudal-fin lobe. (
See ETYFish
)
.
More on authors:
Müller
&
Henle
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; brackish; demersal; amphidromous (Ref.
51243
); depth range 10 - 13 m. Tropical; 26°C - 29°C (Ref.
4959
); 34°N - 26°S, 32°E - 130°E
Indo-West Pacific: Persian Gulf (Ref.
68964
), Somalia (Ref.
30573
), Tanzania, Mozambique (Ref.
5213
), Pakistan to Java in Indonesia; then Japan, China, and Taiwan. Reported from Australia (Ref.
4959
).
Length at first maturity / Size / Weight / Age
Maturity: L
m
38.3
, range 33 - 76.5 cm
Max length : 100.0 cm TL male/unsexed; (Ref.
5450
); max. reported age: 6 years (Ref.
244
)
Dorsal
spines
(total): 0;
Dorsal
soft rays
(total): 0;
Anal
spines
: 0;
Anal
soft rays
: 0. Bronze grey above, white below, fins sometimes darker than body; no conspicuous markings (Ref.
9997
).
Found on rocky substrates of coastal waters and lower reaches of tropical rivers (Ref.
244
). It is uncertain, however, if this species can live in perfectly fresh water for extended periods (Ref.
244
). Forms large schools (Ref.
244
). Adults feed on small bony fishes, shrimps and cuttlefish (Ref.
244
). Viviparous (Ref.
50449
). Common by-catch of the inshore demersal gillnet fisheries, particularly those operating off Kalimantan (Ref.58048). Utilized fresh for human consumption; processed into fishmeal and used as bait for other sharks and bony fishes (Ref.
244
). Maximum sizes up to 120 cm unconfirmed (Ref.
244
).
Viviparous, with an unusual columnar placenta (Ref.
244
). Maternal and foetal placenta comprises the entire placenta (Ref.
39556
). Transplacental nutrient transfer may be hemotrophic (Ref.
39556
). Litter size varies from 1 (Ref.
58048
) to 14 (Ref.
9997
). Size at birth about 13 to 15 cm TL (Ref.
9997
). Distinct pairing with embrace (Ref.
205
).
Compagno, L.J.V.
, 1984. FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 2 - Carcharhiniformes. FAO Fish. Synop. 125(4/2):251-655. Rome: FAO. (Ref.
244
)
IUCN Red List Status (Ref.
130435
)
Near Threatened (NT)
(A2d); Date assessed:
29 April 2020
CITES
Appendix II:
International trade monitored
Not Evaluated
Threat to humans
Harmless (Ref.
244
)
Human uses
Fisheries: commercial; bait: usually
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Estimates based on models
Preferred temperature (Ref.
123201
): 25.3 - 29, mean 28.5 °C (based on 1946 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.7500 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00316 - 0.00479), b=3.05 (3.00 - 3.10), in cm total length, based on LWR estimates for this species (Ref.
93245
).
Trophic level (Ref.
69278
): 3.8 ±0.4 se; based on diet studies.
Resilience (Ref.
120179
): Very Low, minimum population doubling time more than 14 years (K=0.88; tm=2; tmax=6; Fec=1).
Fishing Vulnerability (Ref.
59153
): Moderate to high vulnerability (46 of 100).
Price category (Ref.
80766
):
Medium
.
Nutrients (Ref.
124155
): Calcium = 45 [6, 245] mg/100g; Iron = 0.903 [0.233, 2.570] mg/100g; Protein = 21.2 [18.9, 23.4] %; Omega3 = 0.174 [0.064, 0.437] g/100g; Selenium = 31.8 [6.9, 94.3] μg/100g; VitaminA = 8.81 [3.51, 21.02] μg/100g; Zinc = 0.932 [0.431, 1.731] mg/100g (wet weight);
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