... bass, bluegills, redearsunfish, and catfish, grass carp are not stocked for sport or to eat, but to control or eliminatenuisance aquatic vegetation. Additional informa-tion about grass carp ... butcan grow several feet high.Floating-leaf pondweedCurly-leaf pondweedSago pondweedSmall pondweedElodeaCharaNajasManaging Aquatic Vegetation254Planktonic algaeDuckweed and watermealFilamentous ... different natural and man-made materials.Easily obtained materials such as discardedChristmas trees can be banded together, weightedand sunk, although trees such as oak, hickory,and cedar work...