But genes work in combination with other genes. This means that adding a gene can change the balance between the genes. In his opinion, there should have been a ban on the use of antibiotics in the salmon farming industry as these also promote growth. It becomes a form of drug abuse. We force the fish to produce more and grow more.
Many fish have external damage such as shortened or stunted fins and damaged gills.
I don't think that being given growth hormone makes their lives any worse. We provide the animals with marginal living conditions which make it difficult for them to adapt and this leads to disease. If this is successful we can make their living space even smaller. Professor Christoffersen cites salmon farming as an example. The crowded cages make the salmon more vulnerable to disease and parasites.