Restoring marble trout genes in the Soča River (Slovenia) : Two decades of monitoring the introgression
2022
Berrebi, Patrick | Jesenšek, Dušan | Laporte, Martin | Crivelli, Alain J.
In Slovenia, the unique watershed naturally hosting the marble trout is the Soča River, called Isonzo in Italy. In 1993–1996 molecular data established the existence of extensive hybridization with stocked Atlantic domestic lineages which is a threat for this taxon and for the economy of the country established on the angling tourism. Different management actions have been developed for restoring marble genes since 1996: banning stocking of brown trout, revising fishing regulations for anglers and testing genetically brood stock in hatchery for stocking phenotypic and pure marble fry. This long fight against hybridization was genetically surveyed using allozymes, mitochondrial sequences and microsatellites according to the available technique at each period. Despite the irregularity of genotyping along nearly fifteen years after the new management started, it appears that the proportion of domestic lineage in the river dropped regularly of about 2% each year, a positive result for conservative management measures.
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