Alosa caspia explained

Alosa caspia is a species of alosid fish, one of the species of shad (genus Alosa) endemic to the Caspian Sea basin.

FishBase treats separately three subspecies from the Caspian:

• Caspian shad, Alosa caspia caspia (Eichwald, 1838)
• Enzeli shad, Alosa caspia knipowitschi (Iljin, 1927)
• Astrabad shad, Alosa caspia persica (Iljin, 1927)

Previously the taxonomic circumscription and geographic range of A. caspia have been broader, encompassing also the Sea of Azov and Black Sea basins.^{[1] [2]} Up to ten subspecies were recognised; these included forms now classified as Alosa tanaica (and its synonyms) and even the Balkan freshwater endemics Alosa macedonica and Alosa vistonica.^[1]

Notes and References

1. Book: Whitehead, Peter J.P. . FAO species catalogue. Vol. 7. Clupeoid fishes of the world. An annotated and illustrated catalogue of the herrings, sardines, pilchards, sprats, anchovies and wolfherrings. Part 1 – Chirocentridae, Clupeidae and Pristigasteridae . 1985 . FAO . Rome . FAO Fisheries Synopsis . 125/7/1 . 978-92-5-102340-2. 197–198 .
2. http://www.sevin.ru/vertebrates/index.html?fishes/23.html A. caspia (Eichwald,1838) - каспийско-черноморский пузанок