Overfishing didn't alter their genes. It altered the genepool.
To be fair, that is the subtitle, "Eastern Baltic cod grow to much smaller sizes than they did just 30 years ago, because overfishing altered their genes, according to new research"
alt Hacker News
To be fair, that is the subtitle, "Eastern Baltic cod grow to much smaller sizes than they did just 30 years ago, because overfishing altered their genes, according to new research"