Are farmed fish more disease-prone?

Kenny Black, from the Scottish Association for Marine Science, answered this question...

They are disease prone.

Salmon are pretty robust fish and most of the other cultured fish that we have are cultured because they're not too susceptible to diseases.

Nonetheless, diseases occur anywhere you culture a very large number of organisms in close proximity, you increase the chances that a disease will become an epidemic within that population. So it's all about population size ultimately.

So, the bigger the number of fish, the more risk there is of a disease...