When research is funded by a party with a vested interest in the results, the conclusions drawn from the data are usually skewed. In some instances, contradictory data will be omitted. If the data is exceedingly contrary to expectation, the results get quashed.
Example, butter. Back in the 50's, after extensive world wide research, it was determined that butter, and other dairy fats were bad for you, and since then the big dietary doctrine is that we should all eat margerine.
In the research samplings were done in over 150 countries. Results from countries where results were contrary/ anomalous to the expected finding were quietly omitted. No one bothered to look at fat content in margerine. Fact is the conclusion was drawn long before the research was completed.
Merely one of hundreds of examples of profit generated science. Certainly not good scientific prectice.
Closer to our own time were recent studies on hand sanitizer. The results were not well published with good reason. A soap company, and manufacturer of hand sanitizer products commissioned a study on hand sanitizer efficacy. The result was that many such products often prove to be no more, sometimes less, effective than conventional soap and water. Needless to say, this was not on the 6 o'clock news. Media makes far too much advertising revenue on sanitary products to tip the apple cart.
The salmon fisheries issue is no different. You have foreign and domestic vested interests vying for control over market share and money knows only one ethic; "Keep it in the BLACK".