As I am a bit of an anorak I counted up the times I went fishing last year - 108 times including only one night session all after roach. Blanked 3 times. Caught loads of roach, biggest roach last year was 1lb 13ozs.
Accidental catches included carp to 24lbs 1oz, chub to 4lbs 15oz, PB brown trout to 4lbs 13oz, perch to 2lbs 5oz, crucian to 2lbs 5oz (on the same day my wife caught a 3lbs 2oz crucian), bream to 8lbs, tench to 5lbs 7oz, plus silver bream, minnows, dace, bleak, jack pike, gudgeon - alas not a single barbel. One day last summer when fishing the Thames I lost an absolutely enormous perch which grabbed a roach I was landing. I saw it clearly in the clear water, far, far bigger than the 3 lbers I have caught! Surely there's a lesson there somewhere, deliberately try to catch roach and end up catching everything else by accident!
I fished far too many different lakes, searching for a big roach water. Last year fished 10 lakes, 4 different rivers and 2 different canals.
Today fished the river Kennet, yes for roach for a change! Blanked, not even a bite!