Perch-Hegenen 3-5 Nymphs per system The highly successful and most commonly used bait system for whitefish angler in the alpine lakes. Favored for whitefish, perch, and other types of coregonen. The hegenen are in successful color variations; mounted and ready to go, wound up on a styrofoam card. Whitefish: Length: 1,80 m: 0,20 mm. Perch: Length 1,60 m: 0,22/0,25 mm.