As a generalisation I don't think we do when their minds are on the game. Its only when they take their eye off the ball whilst having a good munch that they slip up.
Great post Jeff, very interesting and informative.

There is no doubt in my mind, and there never was, that line is best pinned down. In fact when fishing in the edge, when the situation allows, I have been known to get in the lake and place small stones at intervals along my line before kicking debris, silt, sand etc over it in an attempt at total concealment. Looks a bit bizarre to see your line going straight down from your rod tip to a pebble before totally disappearing, but in my opinion it can and has made the difference.
There are times though, when pinning your line down, or at least total pin down, is not a practical option, hence my sudden paranoia about line colour. Reading the last few posts it would appear that opinion is swinging in the direction of line colour being an irrelevance, if it’s cutting through the environment they live, the carp will detect it.
God help us! Any innovators out there want to take up the challenge of coming up with a line with stealth technology, that doesn't reflect low audio frequencies.
