Farms are often crowded and prime locations for parasites. Fish farms are notorious: https://www.thetimes.co.uk/article/supermarket-salmon-riddled-with-sea-lice

Farms are often crowded and prime locations for parasites. Fish farms are notorious: https://www.thetimes.co.uk/article/supermarket-salmon-riddled-with-sea-lice-vxkjs9wft https://www.thetimes.co.uk/article/supermarket-salmon-riddle...