Assessment of interbreeding and introgression of farm genes into a small Scottish Atlantic salmon Salmo salar stock: Ad hoc samples - ad hoc results?

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Original languageEnglish
Pages (from-to)2680-2696
Number of pages17
JournalJournal of Fish Biology
Issue number6
Early online date12 Oct 2016
StatePublished - 5 Dec 2016

    Research areas

  • Direct genetic interaction, Farm escapes, Microsatellites, mtDNA


An eclectic set of tissues and existing data, including purposely collected samples, spanning 1997–2006, was used in an ad hoc assessment of hybridization and introgression of farmed wild Atlantic salmon Salmo salar in the small Loch na Thull (LnT) catchment in north-west Scotland. The catchment is in an area of marine farm production and contains freshwater smolt rearing cages. The LnT S. salar stock was found to be genetically distinctive from stocks in neighbouring rivers and, despite regular reports of feral farm S. salar, there was no evidence of physical or genetic mixing. This cannot be completely ruled out, however, and low level mixing with other local wild stocks has been suggested. The LnT population appeared underpinned by relatively smaller effective number of breeders (Neb) and showed relatively low levels of genetic diversity, consistent with a small effective population size. Small sample sizes, an incomplete farm baseline and the use of non-diagnostic molecular markers, constrain the power of the analysis but the findings strongly support the LnT catchment having a genetically distinct wild S. salar population little affected by interbreeding with feral farm escapes.

Bibliographic note

* This paper was presented at the FSBI Symposium, Bangor, in July 2016. Its content may not follow the usual style and format of the Journal of Fish Biology.

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