Retrievals for a spoon and a spinner are slightly different. The spinner tends to create more drag because of the rotation of the blade. When the fish hits, the blade "stops spinning". A lot of time, this feels like a sudden loss of tension on your line, followed by a tug. Set the hook when that happens. For spoons, the tension is less because of the lack of drag. I sometimes like to twitch the rod to produce a better fluttering action on the spoon. Usually the bite on the spoon simply feels like a strong tug. In the last couple of seasons when fishing for pinks with spoons, I've found that a school of them would be "nibbling" on the spoon as it is being retrieved. Perhaps they are not bites, they are most likely due to the pink salmon bumping into the long shank hook before they reach the spoon. When this happens, keep retrieving or slow down the retrieving speed. Most of the time, the fish will commit soon after. Don't lift the lure out of the water until it is by your feet. Many times the fish strike just feet away from you.