Teleostei (teleosts) >
Clupeiformes (Herrings) >
Dorosomatidae (Gizzard shads and sardinellas)
Etymology: Opisthonema: Greek, opisthe = behind + Greek,nema = filament (Ref. 45335).
Issue
Date & author Eschmeyer, pers. comm.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; pelagic-neritic; depth range 0 - 50 m (Ref. 188). Subtropical; 36°N - 6°S, 123°W - 77°W (Ref. 188)
Eastern Pacific: Los Angeles, California to Sechura Bay, Peru. (Included in at least some accounts of Opisthonema bulleri and especially Opisthonema libertate which used to be the only Pacific species recognized).
Size / Weight / Age
Maturity: Lm ? range ? - ? cm
Max length : 30.0 cm TL male/unsexed; (Ref. 55763); common length : 20.0 cm SL male/unsexed; (Ref. 9291)
Dorsal spines (total): 0; Dorsal soft rays (total): 13 - 21; Anal spines: 0; Anal soft rays: 12 - 23. Body moderately deep and compressed; posterior edge of gill openings with two clearly visible, fleshy, protuberances; gill rakers numerous, 41 to 69 on ceratobranchial (in fish longer than 14 cm total length); last dorsal ray elongated and filamentous; back gray-green with silver-white flanks and a black spot behind the gill slit followed by a yellow lateral strip (Ref. 55763). The filamentous last dorsal fin ray distinguishes it from members of any other eastern Pacific clupeoid genus. Separated from other eastern Pacific Opisthonema by having 41 to 69 lower gill rakers in fishes over 14 cm standard length.
Usually found near shore, forming schools. Feeds on crustaceans and pteropods.
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Whitehead, P.J.P., 1985. FAO Species Catalogue. Vol. 7. Clupeoid fishes of the world (suborder Clupeoidei). An annotated and illustrated catalogue of the herrings, sardines, pilchards, sprats, shads, anchovies and wolf-herrings. FAO Fish. Synop. 125(7/1):1-303. Rome: FAO. (Ref. 188)
IUCN Red List Status (Ref. 130435: Version 2024-2)
Threat to humans
Harmless
Human uses
Fisheries: minor commercial; bait: occasionally
Tools
Special reports
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Internet sources
Estimates based on models
Preferred temperature (Ref.
123201): 20.5 - 28.4, mean 25.4 °C (based on 72 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5312 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00794 (0.00454 - 0.01390), b=3.05 (2.90 - 3.20), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245).
Trophic level (Ref.
69278): 3.3 ±0.38 se; based on food items.
Resilience (Ref.
120179): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (20 of 100).
