Thaleichthys pacificus, Eulachon : fisheries

Thaleichthys pacificus (Richardson, 1836)

Eulachon
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Native range | All suitable habitat | Point map | Year 2050
This map was computer-generated and has not yet been reviewed.
Thaleichthys pacificus   AquaMaps   Data sources: GBIF OBIS
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Image of Thaleichthys pacificus (Eulachon)
Thaleichthys pacificus
Afbeelding van Bull. U.S. Bur. Fish.

Classificatie / Namen Lokale namen | Synoniemen | Catalog of Fishes(Genus, Soort(en)) | ITIS | CoL | WoRMS | Cloffa

> Osmeriformes (Freshwater smelts) > Osmeridae (Smelts)
Etymology: Thaleichthys: Greek, thaleia, -as = abundance + Greek, ichthys = fish (Ref. 45335); pacificus: pacificus - of the Pacific (Ref. 1998).
More on author: Richardson.

Milieu: milieu / Klimaatzone / Diepte / verspreidingsgebied Ecologie

marien; zoet water; brak water pelagic-neritic; anadroom (Ref. 138124); diepte 0 - 300 m (Ref. 6793). Temperate; 61°N - 40°N, 171°W - 121°W (Ref. 86798)

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North Pacific: west of Saint Matthew Island and Kuskokwim Bay in the Bering Sea, and Bowers Bank in the Aleutian Islands to Monterey Bay, California, USA. Populations from northern British Columbia are separate from those in the Fraser River (Ref. 10276).

Lengte bij maturiteit / Grootte / Gewicht / Leeftijd

Maturiteit: Lm 15.5, range 15 - 16 cm
Max length : 34.0 cm TL mannelijk / geslacht onbekend; (Ref. 56527); common length : 20.0 cm TL mannelijk / geslacht onbekend; (Ref. 7354); max. gerapporteerde leeftijd: 5 Jaren (Ref. 12193)

Korte beschrijving Determinatiesleutels | Morfologie | Morfometrie

Dorsale stekels (totaal) : 0; Dorsale zachte stralen (totaal) : 10 - 13; Anale stekels: 0; Anale zachte stralen: 18 - 23; Wervels: 65 - 72. Distinguished by the large canine teeth on the vomer and 18 to 23 rays in the anal fin (Ref. 27547). Adipose fin sickle-shaped; paired fins longer in males than in females; all fins with well developed breeding tubercles in ripe males which are poorly developed or absent in females (Ref. 27547). Adult coloration is brown to blue on back and top of the head, the sides lighter to silvery white, and the ventral surface white; speckling is fine, sparse and restricted to the back; peritoneum is light with black speckles (Ref. 6885). Fins transparent, pectorals and caudal often dusky (Ref. 27547). During spawning, male fish has a distinctly raised ridge along the middle of the body and a rough texture, differentiating it from the female which is smaller, smoother and shinier.
Body shape (shape guide): elongated; Cross section: compressed.

Biologie     Verklarende woordenlijst (bv. epibenthic)

Found near shore and in coastal inlets and rivers (Ref. 2850). Possibly to 625 m depth (Ref. 6793). Spends most of its life in the sea, returning to freshwater streams to spawn (Ref. 27547). There is evidence of return to natal streams (Ref. 10276). May migrate up to 160 km upstream. Feeds on plankton and only while at sea (11699, 10276). Excellent food fish and source of oil (15% body wt.). Anadromous (Ref. 96339).

Levenscyclus en paargedrag Maturiteit | Voortplanting | Paaien | Eieren | Fecunditeit | Larven

The spawning run from the sea to freshwater streams begins when river temperature rises to about 4.4° but the fish stop running if temperature exceeds 7.8°C. Males predominate the early part of the run, but their numbers are equalled or exceeded by females later (Ref. 10276, 11699). Adults usually die after spawning but some move back to the sea and return to spawn a second time (Ref. 1998). Upon hatching, larvae are found near the bottom and are soon carried downstream to salt water and eventually found in the scattering layer of coastal waters (Ref. 27547).

Hoofdreferentie Upload uw referenties | Referenties | Coördinator | Medewerkers

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)

Status op de Rode Lijst van het IUCN (Ref. 130435: Version 2025-2 (Global))

  Niet bedreigd (LC) ; Date assessed: 01 March 2012

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Gevaar voor de mens

  Harmless





Gebruik door de mens

Visserij: commercieel
FAO - visserij: landings search; Publication: search | FishSource | Sea Around Us

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Schattingen op basis van modellen

Fylogenetische diversiteitsindex
(Ref. 82804) 		PD50 = 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight a=0.00372 (0.00180 - 0.00765), b=3.17 (2.99 - 3.35), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
Trofisch niveau
(Ref. 69278) 		3.3   ±0.37 se; based on food items.
Generation time 3.2 ( na - na) years. Estimated as median ln(3)/K based on 1 growth studies.
Weerstandsvermogen
(Ref. 120179) 		Gemiddeld, minimale populatieverdubbelingstijd 1,4-4,4 jaar (tm=2-6; tmax=5; K=0.34; Fec=17,000-60,000 Musick et al. 2000 (Ref. 36717)).
Rate of population increase Prior r = 0.15, 95% CL = 0.10 - 0.22, Based on 1 full stock assessment.
Kwetsbaarheid van de visserij
(Ref. 59153) 		Low to moderate vulnerability (33 of 100). 🛈
Kwetsbaarheid voor het klimaat
(Ref. 125649) 		Moderate vulnerability (35 of 100). 🛈
Prijsklasse
(Ref. 80766) 		Very high.
Voedingsstoffen
(Ref. 124155) 		Calcium = 98.1 [24.8, 242.3] mg/100g; Iron = 0.808 [0.238, 2.305] mg/100g; Protein = 14.8 [13.7, 16.1] %; Omega3 = 1.23 [0.53, 3.04] g/100g; Selenium = 13.3 [5.8, 38.0] μg/100g; VitaminA = 15.1 [4.9, 47.7] μg/100g; Zinc = 1.02 [0.47, 1.97] mg/100g (wet weight); based on nutrient studies.