Abstract
In the subantarctic French territory of the Kerguelen Islands, Atlantic salmon Salmo salar was
stocked to create a new population in the Korrigans drainage system.
The analysis of historical scale
collections showed that hybrids were inadvertently introduced with the original Atlantic salmon
stocks.
Later colonization of the Korrigans system by brown trout Salmo trutta was followed by
interspecific hybridization between the two species.
Our results highlight the importance of both
routine genetic monitoring of hatchery stocks and considering the possible influence of other species
when stocking is envisaged.