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Female freshwater drumAplodinotus grunniensRafinesque, from the Red Lakes of north central Minnesota, U.S.A. were sampled periodically over a 13-month period. Red Lakes drum mature at approximately age 9 and can live to be over 60 years old. The ovarian development of drum from its northern limit of distribution is described histologically. The stages of oocyte growth and the seasonal change in the...