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A triploid is a cell that has three sets of chromosomes. Organisms with triploid cells rather than the usual diploid (2 sets) are sterile.

Production of triploids - Developing eggs are rendered triploid by applying pressure, heat, cold or chemical shocks at the time of the second meiotic division (in the first hour of fertilization). All triploid trout stocked into modern fisheries should have started out as female, the reason for this is that male fish are only partially affected. The treated male fish are unable to produce sperm but may still develop functional gonad tissue and may attempt spawning behaviour, this could interfere with the reproduction of wild stocks. Female triploids do not exibit spawning behaviour and therefore don't interfere with the wild population, thus rendering them safe.

Courtesy of Ben

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