Post '82 a figure was added for net dropout (NDO) to all net fisheries. At least through 87. I know of salmon only, as the agencies were separate then. NDO was an add-on that was not included in the data bases. The data bases used at that time included the escapement and documented net catch (for salmon). Adding in NDO, then, provided a buffer that provided some protection for the escapement.

At that time, there was a file of studies (by other entities-including Russia) that had studied the size-selective nature of retention in a gill net and NDO.

From a political point of view, the impact of NDO fell more heavily soon the Tribes as they took essentially significantly more of their share in gill nets while the Cowboys used hook and line and seines.

Note that the order was pre Co-Management.