ScienceDaily stating that "we knew from our earlier research that the age at maturity had been decreasing over this period. Now we wanted to see if there were signs of this also at the genetic level" (Craig, 2018). This fortuitous observation provided scientists with a great opportunity to study a trait for adaptive evolution in vertebrates and apply what they learn to other species. The study was conducted by analyzing scales collected from salmon populations in the Treno River in Northern Finland. Upon analyzing the scales researchers found an allele located on a gene that influences maturity in salmon. The single locus responsible for late maturity in salmon was found in the Vgll3 region of the gene. According to the scientific journal posted in Nature, Ecology and Evolution researchers have calculated an 18% decrease in the vgll3 allele associated with late maturity in the salmon population. The gene which is passed on in sex specific selection is responsible for perpetuating this long observed trend in salmon during migration. Scientists are still exploring what evolutionary purpose this allele serves but what they do now know is it plays an incredible role in the trend of salmon populations around the world. By further studying the allelic effects of this gene, scientists may be able to glean more information about the fitness trait of evolution and get a better understanding of the phenotypic diversity of the salmon population as a whole.