Hereditary effects of artificial selection of sperm for the endurance trait in the carp Cyprinus carpio and the frog Rana temporaria

Studies have been made of the effect of artificial selection of parental sperm by maximum motility time (maximum tolerance) on the body length in carp larva and heat resistance level of muscle tissue in tadpoles. Sperm selection increases mean values of these parameters due to the increase in the progeny of the relative number of long-sized individuals and individuals with higher heat resistance of muscle fibers.