Schnip, that's not all carp do. They search for food on the bottom of a lake, river, or harbour. Meanwhile, they are stirring up sediment and mud, therefore causing clear water to be muddy. Then that mud ruins runs for our native fish, like salmon, steelhead, etc, that require quality,clear, coldwater. Each female can produce about 100,000 eggs each spwaning time. Also, weeds on the bottom and swamp plant along the shore die, due to the carp making muddy water and thrashing around. Carp are horrible fish. The two worst fish in ontario is the carp and gobie. That will change if "frankenfish" (snakehead) invade. Carp are garbage, all the way.