Depends on the water and whether the fish are shy or not.
If they are heavily fished for on Natural baits, used man-mades.
If the are on man-mades, try naturals.
If they are used to a single hook bait, use try a mass particle baiting program, I used to favour chick peas or maize (properly prepared), I would then fish a single contrasting hook bait. Such as a Scopex pop up.
It also depends on what other fish are in the water. If there is predominately carp in the water, try 3-4 pints of maggots and a maggot medusa type bait........(if eels are present, forget it.)
In warmer temperatures, h