1-2 lbs is a good range. At the upper range it's like you're getting a bit more than 3g of long-chain omega-3 per day, which seems like a pretty good dose. More is possibly pushing it with regards to polyunsaturated shenanigans, although higher fish intake in populations tends to look favorable so that's just my speculation.
Did this personal trainer list a reason for that? If it is the mercury, salmon has little mercury and much of it doesn't get absorbed due to the selenium chelating it and preventing absorption.