Alosa alosa
Overview
A detailed profile for this species is sourced from the IUCN Red List of Threatened Species as assessments become available.
The Allis Shad faces severe population declines primarily due to river damming and weir construction that blocks access to spawning grounds in freshwater rivers. Overfishing in both marine and estuarine environments has further reduced breeding populations, while water pollution and habitat degradation in river systems have compromised spawning success and juvenile survival rates.
Habitat
Allis Shad are anadromous fish that spend most of their adult lives in marine coastal waters and estuaries, migrating into freshwater rivers to spawn. They require clean, fast-flowing river systems with gravel beds for successful reproduction and juvenile development.
