Grass carp? read the bit above on green sunfish. Grass carp will take out all vegetation in the pond, wrecking protection areas for small fish and their tendency to stir up the elements play havoc with the eggs. My father tried to "improve" three of his MO farm ponds and turned them into bowls of muck instead. I actually hooked up with one of the grass carp on a wooly bugger (peacock herl base) and had a tremendous fight. Hurled the pig over the bank. Must have weighed 10-12 lb. Enjoy the vegetation, for that is part of the delicate balance. JGW