This file contains : • the identity of the individual fish used in the sperm competition trials • the origin of the individuals (population and ecotype) • the type of experimental trial • the number of eggs of each category (genotyped, undeveloped, unfertilized, sired by focal or competing male) • the relative paternity of the focal male • the testes mass and sperm characteristics for each male used in sperm competition trials VAP: Average-path velocity VCL: Curvilinear velocity VSL: Straight line velocity EI:Eider River GPS:Grosse Ploener Lake MA : Malenter River WS : Westen Lake