This reply is slightly related to carrots.
Where i live, there is a carrots processing plant, and during the washing phase, water is discharged from the plant into a nearby dyke.
The water is clean, but occasionally bits of mud and carrot used to be flushed through this pipe.
I noticed and fished this dyke and found bream, mostly double figure swim around this pipe.
Why ??
The typical answer would be oxygenated water, but i have seen them take the tiny pieces of carrot, and hence me using small pieces on a hook.
I have taken bream up to 14lbs from the dyke that is only 2 metres across.
So if it works for bream, it should work for carp.
I would love to see if anybody catches using carrots.
It could well be the new bait...