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The sperm structure of Tinca tinca L. was studied by transmission electron microscopy (TEM). Sperm with a total length of 26.1+/-3.8 microm have a typical primitive simple structure, called "hydrosperms", with no acrosomal head structure. It may be the smallest sperm ever described in a cyprinid fish. The head is mainly composed of dense and slightly grainy material, which looks fairly uniform except for occasional vacuoles. The midsection is separated from the flagella by cytoplasmic channels and is cylindrical/conical in shape. The vesicles are attached to the most basal region of the flagella, just below the plasma membrane of the flagella.