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Osmerus dentex  Steindachner & Kner, 1870

Pacific rainbow smelt
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Native range | All suitable habitat | Point map | Year 2100
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Osmerus dentex   AquaMaps   Data sources: GBIF OBIS
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Image of Osmerus dentex (Pacific rainbow smelt)
Osmerus dentex
Picture by Bull. U.S. Bur. Fish.

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

Actinopterygii (ray-finned fishes) > Osmeriformes (Smelts) > Osmeridae (Smelts)
Etymology: Osmerus: Greek, osme = odorous; similar to freshly cut cucumbers (Ref. 45335).

Environment / Climate / Range Ecology

Marine; freshwater; brackish; pelagic-neritic; anadromous (Ref. 51243); depth range 0 - 290 m (Ref. 50550).   Polar

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

North Pacific and Arctic: Wonsan, North Korea and the Sea of Okhotsk to Barkley Sound, British Columbia, north to the Bering Sea and the Arctic (Ref. 6793). Estuaries and coastal waters of European and Siberian shores of Arctic ocean from White Sea to Chukota in eastern Siberia (Ref. 59043).

Length at first maturity / Size / Weight / Age

Maturity: Lm ?, range 14 - 16 cm
Max length : 34.0 cm SL male/unsexed; (Ref. 59043); common length : 14.9 cm TL male/unsexed; (Ref. 12193); max. published weight: 119.00 g (Ref. 56483); max. reported age: 11 years (Ref. 59043)

Short description Morphology | Morphometrics

Dorsal spines (total): 0; Dorsal soft rays (total): 8-11; Anal spines: 0; Anal soft rays: 12 - 16; Vertebrae: 63 - 68. Adipose small, sickle shaped (Ref. 6885). Olive green above, shading to silvery below, a bright clearly bounded longitudinal silvery band, becoming dark in preserved specimens; speckled with black on top of head, chin and upper part of body, more plentifully along mid-dorsal line (Ref. 6885).

Biology     Glossary (e.g. epibenthic)

Inhabits brackish water of estuaries, lagoons, coastal shallows and bays, and fresh water in lowland and piedmont rivers (Ref. 59043). A schooling species that inhabits lakes or inshore coastal waters (Ref. 1998). Pelagic at the sea where it occurs at 4-8 m depth (Ref. 59043). In the spring, it leaves the sea or the lake and ascends freshwater streams to spawn. Some remain in fresh water throughout their lives (Ref. 1998); those that enter the sea stay within 8 to 10 km of the shore and probably do not stray far along the coast from the estuary (Ref. 28996). Spawns in rapids, in clear water, over stone-gravel bottom and at depth of 0.2-0.5 m (Ref. 59043). Possibly found up to 425 m depth (Ref. 6793). Young-of-the-year feed mostly on copepods and cladocerans, also rotifers, eggs and algae; adults feed on small crustaceans, fishes and shellfish, also squid, worms, and various insects (Ref. 27547). Feeding virtually ceases during spawning (Ref. 27547). Females grow faster, get bigger and live longer than males (Ref. 27547). Highly esteemed as a food fish ever since white men came to North America (Ref. 27547). Flesh is firm and tasty (Ref. 27547).

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

Rainbow smelt usually return to natal streams to spawn but degree of homing varies from one population to another and may be genetically controlled (Ref. 11226, 30367). Movement into the streams begins when water temperatures reach 2° to 4°C or higher. The upstream run is generally short, at most a few km (Ref. 11226, 28996). Movement to spawning grounds are usually made at night. Males reach spawning grounds an hour or so before the females. Spawning is initiated, at least in part, by the presence of the proper sex ratio in the group, which has been indicated to be no more than four males to one female (Ref. 30366, 30374). The spawning group crowd together and move upstream. Body contact between a male and female brings about a release of sperm and eggs. Only a few eggs are extruded at each spawning act (Ref. 30366), so that the act is repeated over several hours each night for several nights until all eggs are extruded. After each evening's activities, most drift downstream to the larger body of water whence they came to the spawning grounds. Some, mostly males, may remain in the spawning stream during the day. Many spawned-out fish, especially males, die after spawning, but those that survive will spawn again the following year (Ref. 27547). Lake shore spawners on the other hand move inshore in small schools and swim about over rather restricted areas, apparently without any distinct pairing. The composition of the schools change constantly, for individual fish apparently engage in spawning activities for only 15 to 30 minutes at a time, then leave the school (Ref. 30374, 30376).

Main reference Upload your references | References | Coordinator | Collaborators

Mecklenburg, K.C., P.R. Møller and D. Steinke, 2011. Biodiversity oif the Arctic marine fishes: taxonomy and zoogeography. Marine Biodiversity 41(1):109-140. (Ref. 86838)

IUCN Red List Status (Ref. 115185)

CITES (Ref. 108899)

Not Evaluated

Threat to humans

  Harmless




Human uses

Fisheries: commercial; gamefish: yes
FAO(Publication : search) | FisheriesWiki | Sea Around Us

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Internet sources

BHL | Cloffa | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes (gen., sp.) | DiscoverLife | ECOTOX | Faunafri | Fishes of Iran | Fishtrace | GenBank(genome, nucleotide) | GloBI | GOBASE | Google Books | Google Scholar | Google | IGFA World Record | MitoFish | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Scirus | SeaLifeBase | Tree of Life | Wikipedia(Go, Search) | World Records Freshwater Fishing | Zoobank | Zoological Record

Estimates of some properties based on models

Preferred temperature (Ref. 115969): -1.6 - 4.8, mean -0.4 (based on 2071 cells; Ref. 115970).
Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5625   [Uniqueness, from 0.5 = low to 2.0 = high].
Trophic Level (Ref. 69278):  4.2   ±0.0 se; Based on diet studies.
Resilience (Ref. 69278):  Medium, minimum population doubling time 1.4 - 4.4 years (tm=2-3; tmax=7; Fec=1,700).
Prior r = 0.46, 2 SD range = 0.23 - 0.90, log(r) = -0.78, SD log(r) = 0.34, Based on: 1 K, 5 tgen, 1 tmax, 3 Fec records
Vulnerability (Ref. 59153):  High vulnerability (60 of 100) .
Price category (Ref. 80766):   Low.