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Diploid gynogenetic fry of rainbow trout, Salmo guirdnui, were produced by treating eggs activated by UV-irradiated sperm with hydrostatic pressure. Treatments for 10 min at 40 min after activation with 55 000 kPa (8000 psi) pressure resulted in high hatching rates and yields of heterozygous diploid gynogenomes of up to 8 1 Yo. Attempts to produce homozygous diploid gynogenomes by the suppression of the first mitotic division of the eggs failed.Ether treatment alone did not induce diploid gynogenesis.