Leeches control
A measure which can be successful in controlling leeches is bait trapping. A metal can with a reclosable lid (a one pound tobacco or coffee can is ideal) drilled with small holes (depending on the size of the nuisance species) and baited with raw meat may trap large numbers of leeches from a heavily infested area. After feeding, the leeches will have difficulty leaving the can. Destruction of the contents of the can will help in reducing the size of the leech population.
Ducks have also been used to control leech populations, but an over abundance of ducks can create other more serious problems. In order to keep ducks near your area for leech control they will also have to be fed. Duck feed is high in phosphorus and travels rapidly through the duck's digestion system.
Water level manipulation can be used to control bloodsuckers
Regds