translate English to French: However, a key difference is that the fish farmers monitor their fish and remove any with abnormalities, so we are more aware of them. We are investigating the causes of any abnormalities and these seem to be multi-factorial, that is the result of several factors such as combinations of environment and husbandry plus other possible influences.
Elles semblent le résultat de nombreux facteurs comme la combinaison de l' environnement et l'élevage ainsi que d'autres influences possibles.