Alosa aestivalis, Blueback shad : fisheries

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Alosa aestivalis (Mitchill, 1814)

Blueback shad
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Native range | All suitable habitat | Point map | Year 2100
This map was computer-generated and has not yet been reviewed.
Alosa aestivalis   AquaMaps   Data sources: GBIF OBIS
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Image of Alosa aestivalis (Blueback shad)
Alosa aestivalis
Picture by Flescher, D.

Classificatie / Names Populaire namen | Synoniemen | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (Straalvinnigen) > Clupeiformes (Herrings) > Clupeidae (Herrings, shads, sardines, menhadens) > Alosinae
Etymology: Alosa: Latin, alausa = a fish cited by Ausonius and Latin, halec = pickle, dealing with the Greek word hals = salt; it is also the old Saxon name for shad = "alli" ; 1591 (Ref. 45335).  More on author: Mitchill.

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

; marien; zoetwater; brakwater; anadroom (Ref. 51243); diepteverspreiding 5 - 55 m (Ref. 5951).   Subtropical; 47°N - 27°N, 84°W - 60°W (Ref. 117456)

Verspreiding Landen | FAO regio's | Ecosystems | Voorkomen | Point map | Introducties | Faunafri

Western Atlantic: Cape Breton, Nova Scotia south to the St. John's River, Florida; also in lower parts of rivers (Ref. 188). Introduced in reservoirs in several states, and in the upper Tennessee River system in Tennessee, USA (Ref. 117456, 86798).

Size / Gewicht / Leeftijd

Maturity: Lm ?  range ? - ? cm
Max length : 40.0 cm SL mannelijk/geslacht niet bekend; (Ref. 7251); common length : 27.5 cm SL mannelijk/geslacht niet bekend; (Ref. 188); Maximaal gepubliceerd gewicht: 200.00 g (Ref. 7251); Maximaal vermelde leeftijd: 8 jaren (Ref. 12193)

Korte beschrijving Morfologie | Morfometrie

Dorsale stekels (totaal): 0; Dorsale zachte stralen (totaal): 15-20; Anale stekels 0; Anale zachte stralen: 15 - 21; Wervels: 47 - 53. Moderately compressed, belly with distinct keel of scutes. Upper jaw with a distinct notch; lower jaw rising steeply within mouth; minute teeth present at front of jaws (disappearing with age). Lower gill rakers 41 to 52 (fewer in fishes under 10 cm standard length), slender. Back dark blue, sometimes bluish-grey; a dark spot on shoulder (Ref. 188). Peritoneum black (Ref. 7251). Branchiostegal rays 7 (Ref. 4639).

Biologie     Verklarende woordenlijst (b.v. epibenthic)

Inhabits rivers, estuaries, coastal waters, lakes and reservoirs (Ref. 117456). Adults are found in saltwater except during the spawning season and occur up to at least 200 km offshore (Ref. 117456). Forms schools and possibly wintering near the bottom and out from the coast, approaching the shore in the late spring. Feeds on small fishes, copepods and small shrimps. Spawns in brackish- or freshwaters of rivers, arriving in coastal waters a month or so later than A. pseudoharengus (in April at Chesapeake Bay, apparently when the water is above 70° C and later further north). Eggs are essentially pelagic, demersal in still water (Ref. 4639). Larvae are found in fresh and brackish rivers (Ref. 4639). Juveniles leave fresh and brackish nursery grounds at about 5 cm, migrating downstream (Ref. 4639). In freshwater habitat, this species usually occurs in current over rocky bottom (Ref. 86798). Marketed mostly fresh and salted (Ref. 188). Parasites found are acanthocephalan and nematodes (Ref. 37032).

Life cycle and mating behavior Geslachtsrijpheid | Voortplanting | Kuitschieten | Eieren | Fecundity | Larven

Upriver movement to spawning areas occur in late afternoon or at night (Ref. 4639).

Voornaamste referentie Upload your references | Referenties | Coördinator | Medewerkers

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)

Status op de Rode Lijst van het IUCN (Ref. 120744)

  Kwetsbaar, zie IUCN Rode Lijst (VU) (A2b); Date assessed: 13 October 2011

CITES (Ref. 118484)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Gevaarlijk voor mensen

  Harmless





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Alien/Invasive Species database | Aquatic Commons | BHL | Cloffa | BOLDSystems | Websites from users | Bekijk FishWatcher gegevens | CISTI | Catalog of Fishes (gen., sp.) | DiscoverLife | ECOTOX | Faunafri | Fishtrace | GenBank(genoom, nucleotide) | GloBI | Google Books | Google Scholar | Google | IGFA World Record | MitoFish | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Tree of Life | Wikipedia(ga naar, zoek) | World Records Freshwater Fishing | Zoological Record

Estimates based on models

Preferred temperature (Ref. 115969): 11.5 - 24.7, mean 23.7 (based on 86 cells).
Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00832 (0.00388 - 0.01783), b=3.03 (2.86 - 3.20), in cm Total Length, based on LWR estimates for this Genus-body shape (Ref. 93245).
Trophic Level (Ref. 69278):  3.8   ±0.3 se; Based on diet studies.
Weerstandsvermogen (Ref. 120179):  Gemiddeld, minimale populatieverdubbelingstijd 1,4-4,4 jaar (K=0.18; tm=4; Fec=45,800).
Kwetsbaarheid (Ref. 59153):  Moderate to high vulnerability (51 of 100) .
Prijsklasse (Ref. 80766):   Low.