Reviews in Fish Biology and Fisheries

, Volume 10, Issue 3, pp 281-292

First online:

Allozymes, mtDNA and microsatellites study introgression in a stocked trout population in France

  • C. PoteauxAffiliated withLaboratoire d'Ethologie Expérimentale et Comparée
  • , P. BerrebiAffiliated withLaboratoire Génome, Populations, Interactions, CNRS-UMR 5000
  • , F. BonhommeAffiliated withLaboratoire Génome, Populations, Interactions, CNRS-UMR 5000

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A comparative study of disturbed (downstream) and undisturbed (upstream) populations in a French Mediterranean river (the Sorgue) was conducted to assess the fate of introgressing hatchery-genes in the aboriginal gene pool. Variation was assessed at 27 protein-coding loci, three microsatellite loci and two mtDNA restriction sites. The results were compared to those from another Mediterranean drainage basin (that of the river Orb). The genetic pattern observed among markers and drainage basins was found to be noticeably different. A reduction in population size is hypothesized to explain the lower variability observed in the upper part of the river Sorgue. Estimations of hatchery gene flow were different between loci but in the same range of values between markers.

bottleneck brown trout introgression microsatellite polymorphism Salmo trutta