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The rate growth of bleak in Międzyodrze-the wetland located in the lower course of the Odra River above Szczecin-was estimated with use of back-calculations. The fish reaches 59.3 mm in length in the first year of life, 89.1 in the second year, 115.8 mm in the third, and 131.5 mm in the fourth year of life (SL). Females are on the whole larger than males of the same age.