Alosa vistonica the Thracian shad, is an extinct species of shad, a freshwater fish in the family Alosidae. It was endemic to a single shallow lake, Lake Vistonida in northeastern Greece. It was officially declared extinct by the International Union for Conservation of Nature in October 2024 as the species has not been recorded within its only known distribution since 1995.

It was likely driven to extinction through pollution sewage and industrial effluents, destruction of spawning sites by agricultural development and increased salinity following the opening of a canal into the sea.

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