Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopteri (ray-finned fishes) > Osmeriformes
(Freshwater smelts) > Osmeridae
Etymology: Hypomesus: Greek, hypo = under + Greek,mesos = a half (Ref. 45335).
Environment: milieu / climate zone / depth range / distribution range
Freshwater; brackish; pelagic; anadromous (Ref. 51243). Temperate; 73°N - 38°N (Ref. 26213)
North America: Sacramento-San Joaquin Delta region in central California, USA.
Length at first maturity / Size / Weight / Age
Maturity: Lm 6.0, range 6 - 7 cm
Max length : 12.0 cm TL male/unsexed; (Ref. 5723); common length : 6.3 cm TL male/unsexed; (Ref. 12193); max. reported age: 1.00 years (Ref. 12193)
soft rays: 16 - 20;
Vertebrae: 52 - 57. Vomer without posterior process; periphery of glossohyal bone with single row of conical teeth, central part toothless; pyloric caeca 4(2-5); base of adipose fin more than 20% of head length; eye large; adipose eyelid poorly developed.
Adults occur in open brackish and freshwater of large channels. Diet consists of zooplankton (Ref. 33312).
Eggs are demersal (Ref. 33312).
Saruwatari, T., J.A. López and T.W. Pietsch, 1997. A revision of the ormerid genus Hypomesus Gill (Teleostei: Salmoniformes), with a description of a new species from the southern Kuril Islands. Species Diversity 2:59-82. (Ref. 33312)
IUCN Red List Status (Ref. 123251)
CITES (Ref. 123416)
Threat to humans
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= 0.5313 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00182 - 0.00830), b=3.15 (2.96 - 3.34), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic level (Ref. 69278
): 3.2 ±0.1 se; based on diet studies.
Resilience (Ref. 120179
): High, minimum population doubling time less than 15 months (tm=1; tmax=1).
Vulnerability (Ref. 59153
): Low vulnerability (16 of 100) .