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Gymnosarda unicolor, Dogtooth tuna : fisheries, gamefish
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Gymnosarda unicolor
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Teleostei (teleosts) >
Scombriformes
(Mackerels) >
Scombridae
(Mackerels, tunas, bonitos) > Scombrinae
Etymology:
Gymnosarda:
Greek, gymnos = naked + Greek, sarde = sardine; 1598 (Ref.
45335
)
.
More on author:
Rüppell
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; reef-associated; oceanodromous (Ref.
51243
); depth range 0 - 250 m (Ref.
86942
). Tropical; 20°C - 28°C (Ref.
5313
); 31°N - 30°S, 32°E - 130°W (Ref.
168
)
Indo-Pacific: Red Sea and East Africa to French Polynesia, north to Japan, south to Australia.
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 248 cm FL male/unsexed; (Ref.
40637
); common length : 190 cm NG male/unsexed; (Ref.
9710
); max. published weight: 131.0 kg (Ref.
168
)
Dorsal
spines
(total): 13 - 15;
Dorsal
soft rays
(total): 12-14;
Anal
spines
: 0;
Anal
soft rays
: 12 - 13;
Vertebrae
: 38. This species is distinguished by the following characters: body elongate and moderately compressed; mouth fairly large, upper jaw reaching to middle of eye; 14 to 31 large, conical teeth on upper jaw, 10 to 24 on lower jaw; 2 patches of villiform teeth on upper surface of tongue; total gill rakers on first gill arch 11-14; D1 XIII-XV, its border almost straight, the second followed by 6-7 finlets, dorsal fins close together; anal fin followed by 6 finlets; pectoral fins with 25-28 rays; interpelvic process large and single; lateral line strongly undulating; body naked posterior to corselet except for lateral line, dorsal-fin base, and caudal keel; caudal peduncle slender, with a well-developed lateral keel between 2 smaller keels on each side. Colour of back and upper sides brilliant blue-black, lower sides and belly silvery; no lines, spots or other markings on body; anterior tip of first dorsal fin dark; other fins greyish (Ref.
9684
).
An offshore species found mainly around coral reefs. Generally solitary or occur in small schools of six or less. Preys on small schooling fishes such as
Decapterus
,
Caesio
,
Nasio
,
Cirrhilabrus
,
Pterocaesio
and squids. Caught mainly by pole-and-line. Marketed canned and frozen (Ref.
9684
,
48637
). Adults may be ciguatoxic (Ref.
37816
). Minimum depth reported taken from Ref. 128797.
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Collette, B.B. and C.E. Nauen
, 1983. FAO Species Catalogue. Vol. 2. Scombrids of the world. An annotated and illustrated catalogue of tunas, mackerels, bonitos and related species known to date. Rome: FAO. FAO Fish. Synop. 125(2):137 p. (Ref.
168
)
IUCN Red List Status (Ref.
130435
)
Least Concern (LC)
; Date assessed:
01 March 2022
CITES
Not Evaluated
Not Evaluated
Threat to humans
Reports of ciguatera poisoning (Ref.
168
)
Human uses
Fisheries: minor commercial; gamefish: yes
FAO - Fisheries:
landings
; Publication:
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Zoological Record
Estimates based on models
Preferred temperature (Ref.
123201
): 20.9 - 28.2, mean 26.5 °C (based on 938 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01072 (0.00643 - 0.01784), b=3.06 (2.92 - 3.20), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245
).
Trophic level (Ref.
69278
): 4.5 ±0.75 se; based on food items.
Resilience (Ref.
120179
): Low, minimum population doubling time 4.5 - 14 years (Assuming tmax>10).
Fishing Vulnerability (Ref.
59153
): Very high vulnerability (90 of 100).
Climate Vulnerability (Ref.
125649
): Very high vulnerability (92 of 100).
Price category (Ref.
80766
):
High
.
Nutrients (Ref.
124155
): Calcium = 11.6 [6.8, 20.1] mg/100g; Iron = 0.539 [0.311, 0.982] mg/100g; Protein = 21.8 [20.2, 23.1] %; Omega3 = 0.136 [0.084, 0.225] g/100g; Selenium = 69.1 [38.3, 127.4] μg/100g; VitaminA = 51.6 [19.1, 151.7] μg/100g; Zinc = 0.543 [0.384, 0.760] mg/100g (wet weight);
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