Hi One of the major concerns will be the increased water...

Hi

One of the major concerns will be the increased water temperature. Even if it is only a couple of degrees C it will put the fish (soon to be harvest fish especially) under more pressure.
This usually results in loss of fish and/or reduced appetite. Reduced appetite effects growth and overall tonnage
It can also mean more chance of a jellyfish or bacteria bloom around the sites. This can also be deadly to the salmon.

Cheers