Alaska country information

Common names: [No common name]
Occurrence: native
Salinity: marine
Abundance: | Ref:
Importance: | Ref:
Aquaculture: | Ref:
Regulations: | Ref:
Uses: no uses
Comments: Southeastern Alaska (Ref. 96339).
National Checklist:
Country Information:
National Fisheries Authority: http://www.state.ak.us/local/akpages/FISH.GAME/adfghome.htm
Occurrences: Occurrences Point map
Main Ref: Love, M.S., C.W. Mecklenburg, T.A. Mecklenburg and L.K. Thorsteinson, 2005
National Database:

Common names from other countries

Renard, Zorro, القرش الثّعلب, ... more

Classification / Names Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (sharks and rays) > Lamniformes (Mackerel sharks) > Alopiidae (Thresher sharks)
Etymology: Alopias: From alopex, Greek for fox, referring to the ancient vernacular “fox shark,” from its supposed cunning (ancients believed that when it took a bait, it swallowed the hook until it got to the cord, which it bit off and so escaped). (See ETYFish); vulpinus: Latin for fox-like (as for genus). (See ETYFish).
More on author: Bonnaterre.

Environment: milieu / climate zone / depth range / distribution range Ecology

Marine; pelagic-oceanic; oceanodromous (Ref. 51243); depth range 0 - 650 m (Ref. 106604), usually 0 - 200 m (Ref. 55168). Subtropical; 74°N - 58°S, 180°W - 180°E (Ref. 54279)

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

Cosmopolitan in temperate and tropical seas (Ref. 6871, 58085). Population considered reduced (R) in the US Atlantic waters; lower risk/conservation dependent (LR/CD) in US Pacific waters; data deficient (DD) in the rest of Atlantic and rest of Pacific (Ref. 12451). Highly migratory species.

Length at first maturity / Size / Weight / Age

Maturity: L_m 351.0, range 226 - 400 cm
Max length : 573 cm TL male/unsexed; (Ref. 106604); 549.0 cm TL (female); common length : 450 cm TL male/unsexed; (Ref. 5217); max. published weight: 348.0 kg (Ref. 40637); max. reported age: 25 years (Ref. 81241)

Short description Identification keys | Morphology | Morphometrics

Dorsal spines (total): 0; Anal spines: 0. A large thresher with relatively small eyes, curved, narrow-tipped pectoral fins, a narrow-tipped caudal fin, and a conspicuous white patch over the pectoral fin bases (Ref. 5578). Second dorsal origin well behind the rear tip of the pelvic fin (Ref. 559). Upper lobe of caudal fin very long and strap-like, about as long as or longer than length of rest of shark; lower lobe short but well developed (Ref. 13570). Brown, grey, blue-grey, or blackish on back and underside of snout, lighter on sides and abruptly white below; a white area extends from the abdomen over the pectoral-fin bases; pectoral-, pelvic-, and dorsal fins blackish, white dots sometimes present on pectoral-, pelvic-, and caudal- fin tips (Ref. 13570).

Coastal over continental and insular shelves and epipelagic far from land (Ref. 30573, 43278, 58302). Oceanic although most abundant near land, pelagic at 1-366 m (Ref. 58302). Young often close inshore and in shallow bays (Ref. 5578). Feeds on schooling fishes (including mackerels, bluefishes, clupeids, needlefishes, lancetfishes and lanternfishes), squid, octopi, pelagic crustaceans, and rarely seabirds (Ref. 247). Ovoviviparous, embryos feeding on yolk sac and other ova produced by the mother (Ref. 43278, 50449). Uses its long caudal fin to bunch up and stun prey (Ref. 2850). Spatial and depth segregation by sex in northwestern Indian Ocean populations (Ref. 247). A few attacks on boats are doubtfully attributed to this species, but it is otherwise apparently harmless to humans, though the size of adults of this species command respect (Ref. 247). May cause damage to fishing gear (Ref. 6885). Valued for its meat, liver, hide, and fins; utilized fresh, dried-salted, smoked, and frozen (Ref. 9987).

Life cycle and mating behavior Maturities | Reproduction | Spawnings | Egg(s) | Fecundities | Larvae

Ovoviviparous, embryos feed solely on the ova produced by the mother after the yolk sac is absorbed (oophagy) (Ref. 50449), 2 to 4 young in a litter (usually 2) (Ref. 247). Size at birth 114-150 cm (Ref. 247). Distinct pairing with embrace (Ref. 205).

Main reference Upload your references | References | Coordinator : Compagno, Leonard J.V. | Collaborators

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)

Vulnerable (VU) (A2bd); Date assessed: 06 November 2018

CITES (Ref. 128078)

Appendix II: International trade monitored

CMS (Ref. 116361)

Appendix II: Migratory species conserved through agreements

Threat to humans

Harmless (Ref. 247)

Human uses

Fisheries: commercial; gamefish: yes

FAO(Fisheries: production, species profile; publication : search) | FishSource | Sea Around Us

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Estimates based on models

Preferred temperature (Ref. 115969): 11.6 - 28.2, mean 23.3 (based on 8352 cells).

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 0.7500 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.00851 (0.00363 - 0.01997), b=2.86 (2.66 - 3.06), in cm Total Length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245).

Trophic level (Ref. 69278): 4.5 ±0.0 se; based on diet studies.

Resilience (Ref. 120179): Low, minimum population doubling time 4.5 - 14 years (K=0.1; tm=5-7; tmax=19; Fec=2-4).

Prior r = 0.05, 95% CL = 0.03 - 0.07, Based on 1 full stock assessment.

Fishing Vulnerability (Ref. 59153): Very high vulnerability (77 of 100).

Climate Vulnerability (Ref. 125649): High vulnerability (62 of 100).

Price category (Ref. 80766): High.

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