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Siganus randalli, Variegated spinefoot : fisheries, aquaculture
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Siganus randalli
Picture by
Woodland, D.J.
Teleostei (teleosts) >
Acanthuriformes
(Surgeonfishes) >
Siganidae
(Rabbitfishes)
Etymology:
Siganus:
Latin, siganus = a fish, rabbit fish; by the similarity of the nose (Ref.
45335
)
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; reef-associated; depth range 1 - 15 m (Ref.
37816
). Tropical; 15°N - 15°S, 135°E - 159°W
Western Pacific: Solomon Islands, Papua New Guinea, Pohnpei, Kosrae, and Guam.
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 33.5 cm FL male/unsexed; (Ref.
107958
); common length : 25.0 cm TL male/unsexed; (Ref.
9813
); max. published weight: 824.00 g (Ref.
107958
)
Dorsal
spines
(total): 13;
Dorsal
soft rays
(total): 10;
Anal
spines
: 7;
Anal
soft rays
: 9;
Vertebrae
: 23. Body is bronze, with bluish spots on the head and anterior portion of the body. These spots join in the posterior portion to form vermiculating patterns. Preopercular angle 98°-102°; strong scales covering cheeks with 9-11 rows deep below center of orbit; midline of thorax scaled, pelvic ridges without scales. Low rim of anterior nostril bearing a minute, pointed peak posteriorly. The spines are stout, blunt and venomous.
S. randalli
is similar to
S. vermiculatus
but is spotted on the head and front of the back (Ref.
37816
).
Adults inhabit coral reef areas with sand and coral rubble, down to at least 15 m. Juveniles found in mangroves (Ref.
9710
). Adults occur in schools of 10 to 20 or more and feed on algae growing on compacted pavement areas (Ref.
9813
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Woodland, D.J.
, 1990. Revision of the fish family Siganidae with descriptions of two new species and comments on distribution and biology. Indo-Pac. Fish. (19):136 p. (Ref.
1419
)
IUCN Red List Status (Ref.
130435
)
Least Concern (LC)
; Date assessed:
12 March 2015
CITES
Not Evaluated
Not Evaluated
Threat to humans
Venomous
Human uses
Fisheries: subsistence fisheries; aquaculture: experimental
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Estimates based on models
Preferred temperature (Ref.
123201
): 28.7 - 29.5, mean 29.1 °C (based on 328 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01479 (0.00801 - 0.02733), b=3.05 (2.89 - 3.21), in cm total length, based on LWR estimates for this species & Genus-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 2.0 ±0.00 se; based on food items.
Resilience (Ref.
120179
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153
): Low to moderate vulnerability (27 of 100).
Price category (Ref.
80766
):
High
.
Nutrients (Ref.
124155
): Calcium = 38.2 [18.7, 89.5] mg/100g; Iron = 0.675 [0.317, 1.554] mg/100g; Protein = 18.5 [17.0, 20.0] %; Omega3 = 0.094 [0.049, 0.188] g/100g; Selenium = 19.1 [7.5, 48.9] μg/100g; VitaminA = 32.3 [7.4, 131.7] μg/100g; Zinc = 1.39 [0.54, 2.95] mg/100g (wet weight);
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