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Lamna ditropis, Salmon shark : fisheries, gamefish
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Lamna ditropis
Picture by
Murch, A.
Elasmobranchii (sharks and rays) >
Lamniformes
(Mackerel sharks) >
Lamnidae
(Mackerel sharks or white shark)
Etymology:
Lamna:
From the Greek
lamia
, a large and voracious shark, originally from
Lamia
in Greek mythology, daughter of King Belos, who revenged the murder of her children by killing the children of others, and who behaved so cruelly that her face turned into a nightmarish mask. (
See ETYFish
)
;
ditropis:
di-
, from
dis
(L.), in two;
tropis
(Gr.), keel, i.e., double-keeled, referring to the rudder-like projections on either side of tail. (
See ETYFish
)
.
More on authors:
Hubbs
&
Follett
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; pelagic-oceanic; oceanodromous (Ref.
51243
); depth range 0 - 650 m (Ref.
50550
), usually 0 - 152 m (Ref.
55221
). Boreal; 66°N - 22°N, 120°E - 115°W
North Pacific: Japan, Korea, and the Sea of Okhotsk to the Bering Sea and southward to southern California, USA (Ref.
247
) and Baja California, Mexico (Ref.
9253
).
Length at first maturity / Size / Weight / Age
Maturity: L
m
 
?
  range ? - 221 cm
Max length : 305 cm TL male/unsexed; (Ref.
247
); common length : 180 cm TL male/unsexed; (Ref.
9988
); max. published weight: 175.0 kg (Ref.
9988
); max. reported age: 27 years (Ref.
119696
)
Dorsal
spines
(total): 0;
Dorsal
soft rays
(total): 0;
Anal
spines
: 0;
Anal
soft rays
: 0. First dorsal fin uniformly dark, no light rear tip; ventral surface of body white with dusky blotches (Ref.
247
).
A coastal-littoral and epipelagic shark that prefers boreal to cool temperate waters, from the surface to at least 152 m, and is common in continental offshore waters but range inshore to just off beaches. Occurs singly or in schools or feeding aggregations of several individuals; feeds on fishes (Ref.
247
). Seasonally migratory (following food prey) and segregate by age and sex where adults move further north than young (Ref.
58085
). Ovoviviparous, embryos feeding on yolk sac and other ova produced by the mother (Ref.
50449
). With up to 4 young in a litter (Ref.
247
). Fast swimmer (Ref.
9988
). Potentially dangerous but has never or seldom been implicated in human attacks (Ref.
247
). Causes considerable damage to commercial catches and gear (Ref.
6885
). Utilized fresh, dried or salted, and frozen; fins, hides and livers are also used, with fins having particular value; can be broiled and baked (Ref.
9988
). Reported to attain at least 27 years of age and reach maximum depth of at least 792 m (in Ref. 119696).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Exhibit ovoviparity (aplacental viviparity), with embryos feeding on other ova produced by the mother (oophagy) after the yolk sac is absorbed (Ref.
50449
). Litter size is up to 4 young (Ref.
247
). 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 1 - Hexanchiformes to Lamniformes. FAO Fish. Synop. 125(4/1):1-249. Rome, FAO. (Ref.
247
)
IUCN Red List Status (Ref.
130435
)
Least Concern (LC)
; Date assessed:
06 November 2018
CITES
Not Evaluated
Not Evaluated
Threat to humans
Traumatogenic
Human uses
Fisheries: minor commercial; gamefish: yes
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Estimates based on models
Preferred temperature (Ref.
123201
): 1.7 - 8.7, mean 4.7 °C (based on 832 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.7813 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00933 (0.00405 - 0.02151), b=3.04 (2.84 - 3.24), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 4.5 ±0.80 se; based on food items.
Generation time: 6.5 ( na - na) years. Estimated as median ln(3)/K based on 2
growth studies.
Resilience (Ref.
120179
): Very Low, minimum population doubling time more than 14 years (Fec=4).
Fishing Vulnerability (Ref.
59153
): High vulnerability (59 of 100).
Price category (Ref.
80766
):
Unknown
.
Nutrients (Ref.
124155
): Calcium = 3.95 [1.03, 23.07] mg/100g; Iron = 0.366 [0.089, 1.235] mg/100g; Protein = 19.5 [17.2, 22.0] %; Omega3 = 0.396 [0.154, 1.000] g/100g; Selenium = 14.3 [3.8, 43.3] μg/100g; VitaminA = 5.42 [1.11, 26.30] μg/100g; Zinc = 0.185 [0.091, 0.353] mg/100g (wet weight);
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- 20 July 2016
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