| In 1925, 40,000 rainbow trout fingerlings were released to the Samokovska Bistritza R. In 1926, some Rila lakes, including Saragol and Grunchar, and most of the high-altitude montane rivers such as Vladeiska, Iskrezka, Blato (Sofia District) and Stara Reka, Chetirideset Izvora, Tschaia (Plovdiv district) were stocked with rainbow trout. By the late 1960s, most of the high mountain rivers and lakes in the Rila, Rodopa, Pirin and Stara Planina ranges had been planted with Rainbow trout, which it was believed might eventually displace native species.
Ref:
Lever, C., 1996
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