The article manages to mix up two separate points, the genetic dilution of stock from escapee salmon is a problem but its not escapee’s that have caused the parasite infestation! It is the very existence of salmon cages in the estuaries of the rivers that Salmon run to spawn that causes the Sea-Lice parasite problem! The un-naturally high concentration of Salmon in the cages causes vast “blooms” of sea-lice which attach themselves to the farmed salmon but also more significantly to the juvenile wild salmon (smolts) returning to the sea after being spawned in the rivers. These young fish do not have the strength to fight off the parasite and die before ever reaching the feeding grounds, statistics on the mortality of smolts are mind-boggling and it is no wonder that Salmon have been more or less wiped on some west coast rivers . Even worse is the effect on Sea-Trout which have a similar life cycle to the Salmon but spend their life at seas feeding in and around the estuary of the river of their birth and the Salmon farms. These fish have NO CHANCE - with sea lice density being so high in these areas - it is hardly surprising that the Sea Trout has faired even worse that the salmon.