The Atlantic salmon is one of many fish species that shares a characteristic silvery luster of their skin and scales. This is typically attributed to the evolution of biogenic multilayer reflectors composed of stacks of intracellular anhydrous guanine crystals separated by cytoplasm. In rare cases, individuals without this typical luster are observed, and are not favored by consumers due to their appearance deviating from the shiny silver coloration expected of a fresh and healthy product. There is no evidence to date to suggest that this rare phenotype has any detrimental effects to the fish itself or the quality of the flesh, and based on similarities to other scale mutation phenotypes, we hypothesized that it may be the result of a rare, possible recessive allele segregating in the population. A population of 6050 animals from 260 families of the 2020 yearclass from Mowi Norway were genotyped with a 57K SNP array and phenotyped for this analysis. About 2.5% of the fish were lacking the silvery luster phenotype. We estimated the heritability and performed GWAS of silvery luster (binary phenotype indicating the presence and absence of silvery). Heritabilities for the silvery luster phenotypes was estimated as 0.34 ± 0.02. GWAS revealed a highly significant peak on chromosome 16. Furthermore, animals with two copies of the recessive "T” allele lack the silvery luster coating on their scales. We are currently using sequence information to identify and fine map the causative mutation. The QTL identified could be used to eliminate fish without the luster phenotype.