Country Species Summary

Alosa aestivalis in USA (contiguous states)
Blueback shad

Alosa aestivalis (Mitchill, 1814)
Family:	Clupeidae (Herrings, shads, sardines, menhadens)	picture (Alaes_u0.jpg) by Flescher, D.
Order:	Clupeiformes (herrings)
Class:	Actinopterygii (ray-finned fishes)
FishBase name:	Blueback shad
Max. size:	40.0 cm SL (male/unsexed; Ref. 7251); max. published weight: 200 g (Ref. 7251); max. reported age: 8 years
Environment:	pelagic-neritic; anadromous ; depth range 5 - 55 m
Climate:	subtropical; 41°N - 25°N
Global Importance:	fisheries: commercial
Resilience:	Medium, minimum population doubling time 1.4 - 4.4 years (K=0.18; tm=4; Fec=45,800)
Distribution:	Western Atlantic: Cape Breton, Nova Scotia south to the St. John's River, Florida; also in lower parts of rivers.
Diagnosis:	Dorsal spines (total): 0-0; Dorsal soft rays (total): 15-20; Anal spines: 0-0; Anal soft rays: 15-21; Vertebrae: 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).
Biology:	Form schools and possibly wintering near the bottom and out from the coast, approaching the shore in the late spring. Feed on small fishes, copepods and small shrimps. Spawn 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). Marketed mostly fresh and salted (Ref. 188). Parasites found are acanthocephalan and nematodes (Ref. 37032)
Threatened:	Not Evaluated, see IUCN Red List , (Ref. 36508)
Dangerous:	harmless
Coordinator:
Main Ref:	Whitehead, P.J.P.. 1985. (Ref. 188)
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USA (contiguous states) country information
Common names:	Blueback herring, Herring, River herring	Ref: Randolph, S. and M. Snyder, 1993
Status:	native	Ref: Bowman, R.E., C.E. Stillwell, W.L. Michaels and M.D. Grosslein, 2000
Salinity:	freshwater, brackish, marine
Uses:	no uses
Comments:	Middle Atlantic and Scotian Shelf (Ref. 37512). Found in Chesapeake Bay and virtually all streams tributary to the Bay, Delaware River, and offshore waters of New Jersey (Ref. 4639).
States/Provinces:	Florida (native) New Jersey (native)
States/Provinces Complete?:	No
Country Information:	www.cia.gov/cia/publications/factbook/geos/us.html
National Fisheries Authority:	www.nmfs.gov
Occurrences:	Occurrences Point map
Main Ref:	Whitehead, P.J.P., 1985
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Modified: Ortañez, Auda Kareen

Entered: Carpenter, Kent E.

CGNET - US

Page created by: Eli, 20.10.03, last modified by Eli, 26.06.07

	Ref.:		Glossary
		(e.g. 9948)		(e.g. cephalopods)
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