Twait shad are silvery, sometimes with a bronzy tinge, and there are a distinctive row of six to ten large dark spot just behind the gill cover though these may fade when the fish is dead. The adult length is typically . The twait shad is found in most of Europe and all countries bordering the Mediterranean Sea. "Alosa fallax" has a similar lifecycle to "A. alosa" (allis shad). They are known to live in sympatry. Some studies have suggested "A. fallax" and "A. alosa" species can hybridize. They are anadromous species, like many other species in the genus "Alosa". However, some
Pelecus cultratus Pelecus cultratus Pelecus cultratus, known variously as the sichel, the ziege, the sabre carp or sabrefish, is a species of cyprinid fish from an Eastern Europe and adjacent Asian regions. It is the only species of its genus. This species inhabits lower reaches of rivers and brackish waters of eastern Baltic, Black, Caspian and Aral Sea basins. This fish has no major threats and the IUCN lists it as being of "Least Concern". The ziege resembles a large Baltic herring in appearance. It grows to about in length. It has a keel on its belly which from the side looks