Same way you target massive schools of second run reds - by taking a look a the OTF and going just up inlet where the numbers were taken.  There was a Coho OTF that identified a huge school of coho.  Two days later ADF&G commfish put the fleet on the school which was outside the corridors.  Interesting timing, that.

Here's the fun question:  Given that we have at least 4 stocked silver runs in UCI (Ship, Bird, Campbell & Eklutna), how many of those fish were stocked silvers?  Cheers -