It might be they were feeding on some natural food after spawning, getting certain essentials back inside them and would ignore other stuff. On some of my local stretches of the thames the bream can go beserk topping first light and really snatching at bait. Often though it takes a while after spawning for the bream to start feeding properly and taking baits on the rivers, often everybody has a bad opening of the season for bream. Wouldn't worry about using fishmeal (bream love it) and turning perch on as getting them feeding might give competion to the bream and they may start too?
Try small baits over lots of particles on a long tail length, they do seem to love filter feeding at the start of the season(try a slightly bouyant fake caster which will waft up with the other small bits).
Apart from that, sit back watch the fish, enjoy the sun and quiet river, and hope!