Dorosoma petenense

Common Name

Threadfin Shad

Year Described

G√ľnther, 1867


Dorsal Fin: 11-14
Anal Fin: 17-27
Pectoral Fin:
Pelvic Fin: 7-8 (6-7 branched)
Vertebrae: 40-45
Lateral Line Scales: 41-48
Ventral Scutes: 23-29
Gill Rakers: 400+ (first arch in adults)

Mouth terminal. Dorsal fin with a filamentous final ray.


Bright silvery body with a bluish back. A black spot behind the upper gill cover. Dorsal and caudal fins dusky to yellowish. Other fins transparent to yellowish.


Maximum size to 22cm TL.


Inshore coastal waters to pure freshwater rivers. Juveniles in freshwater.


Gulf of Mexico drainages from Florida to the Yucatan. Extends south to Belize along the Caribbean coast.


McEachran, J.D. & J.D. Fechhelm. 1998. Fishes of the Gulf of Mexico. Volume 1: Myxiniformes to Gasterosteiformes. University of Texas Press, Austin. i-viii + 1-1112.

Munroe, T.A. & M.S. Nizinski. 2002. Clupeidaeidae (pp 804-830). In: Carpenter. 2002. The living marine resources of the Western Central Atlantic. Vol. 2: Bony fishes part 1 (Acipenseridae-Grammatidae). FAO Species Identification Guides for Fisheries Purposes. American Society of Ichthyologists and Herpetologists Special Publication No. 5.