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Diplodus annularis, Annular seabream : fisheries, gamefish
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Diplodus annularis
Picture by
Patzner, R.
Teleostei (teleosts) >
Eupercaria/misc
(Various families in series Eupercaria) >
Sparidae
(Porgies)
Etymology:
Diplodus:
Greek, diploos = twice + Greek, odous = teeth (Ref.
45335
)
.
More on author:
Linnaeus
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; brackish; benthopelagic; depth range 0 - 90 m (Ref.
4781
). Subtropical; 49°N - 27°N, 19°W - 42°E
Eastern Atlantic: Canary islands, also found along the coast of Portugal northward to the Bay of Biscay, Mediterranean, Black Sea and Sea of Azov (Ref.
4781
).
Length at first maturity / Size / Weight / Age
Maturity: L
m
11.6
, range 8 - 19.6 cm
Max length : 28.0 cm TL male/unsexed; (Ref.
124816
); common length : 13.0 cm TL male/unsexed; (Ref.
3397
); max. published weight: 330.00 g (Ref.
115876
); max. reported age: 17 years (Ref.
124518
)
Dorsal
spines
(total): 11;
Dorsal
soft rays
(total): 11-13;
Anal
spines
: 3;
Anal
soft rays
: 11 - 12
Inhabit chiefly
Zostera
seagrass beds but also found on
Posidonia
beds and sandy bottoms, rarely on rocky bottoms. Carnivorous, feed on worms, crustaceans, mollusks, echinoderms and hydrozoans. The sexes are separated, although these fish are potential hermaphrodites; certain individuals are protandric (Ref.
4781
).
Normally sexes are separate but some individuals are protandrous due to geographical variation in sexual pattern (Ref.
103751
). However, histological studies confirm no degenerating functional tissue of one sex (e.g. vitellogenic or later-stage follicles) and no proliferation of tissue of the other sex can be found on this species indicating the absence of sex change. This particular condition is also known as nonfunctional hermaphroditism previously known as rudimentary hermaphroditism (Ref.
91314
). Also Ref. 28504.
Bauchot, M.-L. and J.-C. Hureau
, 1990. Sparidae. p. 790-812. In J.C. Quero, J.C. Hureau, C. Karrer, A. Post and L. Saldanha (eds.) Check-list of the fishes of the eastern tropical Atlantic (CLOFETA). JNICT, Lisbon; SEI, Paris; and UNESCO, Paris. Vol. 2. (Ref.
3688
)
IUCN Red List Status (Ref.
130435
)
Least Concern (LC)
; Date assessed:
18 August 2009
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
Fisheries: commercial; gamefish: yes
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Zoological Record
Estimates based on models
Preferred temperature (Ref.
123201
): 14.8 - 21.1, mean 18.3 °C (based on 220 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01202 (0.01093 - 0.01323), b=3.07 (3.05 - 3.09), in cm total length, based on LWR estimates for this species (Ref.
93245
).
Trophic level (Ref.
69278
): 3.6 ±0.0 se; based on diet studies.
Generation time: 4.5 (2.4 - 6.4) years. Estimated as median ln(3)/K based on 18
growth studies.
Resilience (Ref.
120179
): Medium, minimum population doubling time 1.4 - 4.4 years (K=0.2-0.5; tmax=7; Fecundity=18,000 - 212,000).
Prior r = 0.75, 95% CL = 0.50 - 1.13, Based on 4 stock assessments.
Fishing Vulnerability (Ref.
59153
): Moderate vulnerability (36 of 100).
Climate Vulnerability (Ref.
125649
): Moderate vulnerability (36 of 100).
Price category (Ref.
80766
):
Low
.
Nutrients (Ref.
124155
): Calcium = 83.2 [48.2, 160.3] mg/100g; Iron = 0.984 [0.561, 1.738] mg/100g; Protein = 19.3 [18.4, 20.3] %; Omega3 = 0.427 [0.224, 0.818] g/100g; Selenium = 23.7 [11.6, 43.4] μg/100g; VitaminA = 20.1 [6.8, 55.9] μg/100g; Zinc = 1.06 [0.72, 1.48] mg/100g (wet weight);
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