Screening for genetic markers to assess potential genetic impact from salmon ranching on wild stocks

Abstract

Genetic markers are needed to assess the potential genetic impact on wild salmon populations from ocean ranching. In 1990 spawners from four Norwegian rivers: Lone, Vosso, Dale and Onarheim were screened for genetic variability in isozymes and genomic DNA. Variability was detected in LDH, MDH, MEP, IDDH, and with single locus probes (SLP's) in DNA fingerprint analysis. Sibling groups with the observed variability in isozymes are kept separate for further studies on the suitability of the observed variants as genetic markers. Tests of growth rates and survival on different genotypes are being conducted. Groups of genetically marked salmon will be released to study the potential impact on wild populations from ocean ranching and enhancement activities.