Last weekend my uncle and I went to south Kenai. It was slow. We slid our nets in and within 10 minutes we both had a fish. The 2 guys on either side hadn't caught anything for over an hour. After that we didn't catch for a long time either.
I've experienced this before. Catch a fish straight off (to the cursings from other dippers that have been shivering next to you) then nothing for a long time.
I wonder if the flotsam that collects on a net after its been in the water for a while deters the fish?