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Tetragonurus cuvieri, Smalleye squaretail
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Smalleye squaretail
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Tetragonurus cuvieri
Picture by
Cruscanti, M.
Teleostei (teleosts) >
Scombriformes
(Mackerels) >
Tetragonuridae
(Squaretails)
Etymology:
Tetragonurus:
Greek, tetra = four + Greek, gonia = angle + Greek, oura = tail (Ref.
45335
)
;
cuvieri:
Named after G.C.L.D. Cuvier 1769-1832, a founder of modern ichthyology (Ref.
6885
)
.
More on author:
Risso
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; bathypelagic; oceanodromous (Ref.
51243
); depth range 1 - 800 m (Ref.
10823
). Deep-water
Eastern Pacific: Aleutian Islands, Alaska to Baja California, Mexico; Chile (Ref.
9068
). Western Pacific: Japan (Ref.
559
), New Zealand and Australia (Ref.
6885
). Western Indian Ocean: Natal, South Africa (Ref.
4415
). Atlantic Ocean, including the Mediterranean (Ref.
4415
).
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 70.0 cm TL male/unsexed; (Ref.
4415
)
Dorsal
spines
(total): 15 - 21;
Dorsal
soft rays
(total): 12-15;
Anal
spines
: 1;
Anal
soft rays
: 11 - 13;
Vertebrae
: 52. Pectorals and pelvic fins small (Ref.
6885
). Dark brown, paler at base of tail and on head, otherwise almost uniform throughout (Ref.
6885
).
Oceanic, usually near surface; possibly near bottom. Perhaps occurs in schools. Young usually among jellyfishes or inside large salps. Feeds on jellyfishes and salps (Ref.
2850
), also other soft-bodied coelenterates, ctenophores, as well as plankton. There are conflicting reports that the flesh of this species is poisonous (Ref.
11149
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Haedrich, R.L.
, 1986. Tetragonuridae. p. 851. In M.M. Smith and P.C. Heemstra (eds.) Smiths' sea fishes. Springer-Verlag, Berlin. (Ref.
4415
)
IUCN Red List Status (Ref.
130435
)
Least Concern (LC)
; Date assessed:
19 May 2013
CITES
Not Evaluated
Not Evaluated
Threat to humans
Reports of ciguatera poisoning (Ref.
4690
)
Human uses
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Estimates based on models
Preferred temperature (Ref.
123201
): 5.6 - 17.9, mean 10.1 °C (based on 809 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 (0.00180 - 0.00842), b=3.12 (2.94 - 3.30), in cm total length, based on all LWR estimates for this body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 3.8 ±0.35 se; based on food items.
Generation time: 11.0 ( na - na) years. Estimated as median ln(3)/K based on 1
growth studies.
Resilience (Ref.
120179
): Low, minimum population doubling time 4.5 - 14 years (K=0.10).
Fishing Vulnerability (Ref.
59153
): High to very high vulnerability (66 of 100).
Nutrients (Ref.
124155
): Calcium = 22.1 [8.1, 49.5] mg/100g; Iron = 0.298 [0.130, 0.826] mg/100g; Protein = 18 [17, 19] %; Omega3 = 0.113 [0.044, 0.280] g/100g; Selenium = 17.9 [6.2, 47.0] μg/100g; VitaminA = 33 [4, 264] μg/100g; Zinc = 0.487 [0.266, 0.950] mg/100g (wet weight);
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