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Sebastolobus alascanus Bean, 1890

Shortspine thornyhead
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Sebastolobus alascanus   AquaMaps   Data sources: GBIF OBIS
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Image of Sebastolobus alascanus (Shortspine thornyhead)
Sebastolobus alascanus
Picture by Love, M.

Classification / Names Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (ray-finned fishes) > Scorpaeniformes (Scorpionfishes and flatheads) > Sebastidae (Rockfishes, rockcods and thornyheads) > Sebastolobinae
Etymology: Sebastolobus: Greek, sebastes = august, venerable + Greek, lobos = lobe (Ref. 45335);  alascanus: Species name after Alaska, the type locality (Ref. 27436).  More on author: Bean.

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

Marine; demersal; depth range 17 - 1600 m (Ref. 50550), usually 91 - ? m (Ref. 2850).   Temperate

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

North Pacific: Sea of Okhotsk north to the Navarin Canyon in the Bering Sea and from Stalemate Bank and Ulm Plateau in the Aleutian Islands southeast to Cedros Island, Baja California, Mexico. Reported from Japan (Ref. 559).

Length at first maturity / Size / Weight / Age

Maturity: Lm 22.0  range ? - ? cm
Max length : 80.0 cm SL male/unsexed; (Ref. 559); max. published weight: 9.0 kg (Ref. 56527); max. reported age: 100 years (Ref. 90032)

Short description Morphology | Morphometrics

Dorsal spines (total): 15 - 17; Dorsal soft rays (total): 8-9; Anal spines: 3; Anal soft rays: 4 - 5. Head spines very strong - nasal, preocular, supraocular, postocular, tympanic, parietal and nuchal spines present, coronal spines absent; large head and elongate body; strong spiny ridge on head; 3rd dorsal spine not much longer than 2nd, 4th or 5th; strong notch on pectoral fin (Ref. 27437). Bright red with some black on fins; gill chamber mostly pale (Ref. 27437). Caudal slightly rounded (Ref. 6885).

Biology     Glossary (e.g. epibenthic)

Very common on soft bottoms (Ref. 2850). Oviparous (Ref. 205). Eggs are extruded in floating gelatinous masses (Ref. 31279). Have a thick glandular tissue on posterior margin of fin spines which is believed to be venomous (Ref. 57406). Rarely taken by game fishers (Ref. 27436). Flesh sweeter than that of other rockfishes (Ref. 27436).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Unlike other representatives of this group, this species has internal fertilization Oviparous (Ref. 6885). Females possess specialized ovarian structures including stalk-like ovigerous lamellae and secretory epithelia (Ref. 32832).

Main reference Upload your references | References | Coordinator | Collaborators

Eschmeyer, W.N., E.S. Herald and H. Hammann, 1983. A field guide to Pacific coast fishes of North America. Boston (MA, USA): Houghton Mifflin Company. xii+336 p. (Ref. 2850)

IUCN Red List Status (Ref. 119314)

  Endangered (EN) (A2d); Date assessed: 01 January 2000

CITES (Ref. 115941)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Venomous (Ref. 57406)

Human uses

Fisheries: minor commercial
FAO(fisheries: production; publication : search) | FishSource | Sea Around Us

More information

FAO areas
Food items
Food consumption
Aquaculture profile
Allele frequencies
Mass conversion
Stamps, Coins Misc.
Swim. type
Gill area


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Internet sources

Estimates of some properties based on models

Preferred temperature (Ref. 115969): 1.2 - 6.7, mean 3.8 (based on 417 cells).
Phylogenetic diversity index (Ref. 82805):  PD50 = 0.6250   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00724 (0.00435 - 0.01206), b=3.14 (2.99 - 3.29), in cm Total Length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245).
Trophic Level (Ref. 69278):  3.6   ±0.3 se; Based on diet studies.
Resilience (Ref. 69278):  Very Low, minimum population doubling time more than 14 years (tmax> 100 (validated age: 62 yrs); tm= 13; Fec > 10,000).
Prior r = 0.02, 95% CL = 0.01 - 0.03, Based on 1 stock assessment.
Vulnerability (Ref. 59153):  High to very high vulnerability (70 of 100) .
Price category (Ref. 80766):   Very high.