I had a brief session on the Thames last night - a new stretch, so just a recce really. I started by feeding some 'gros gardon' groundbait (it was a cut, narrow enough to ball it in), then tackled up and put 2 maggots on the hook with maggot feeder. Straight away I had two small but reasonable fish, perch and chublet, around 4 oz. But then the micro fish moved in, 2-3" long. Hard to hit the bites, and no more reasonable fish. I switched to corn for 20 minutes, but no bites and went home.
So, I guess the mistake was using maggot feeder in summer? It seemed that the maggot feeder had attracted the micro fish when the groundbait hadn't?
Any theories why that should be? And how so you avoid micro fish in rivers in the summer?