Karpoed has the form of a flat rounded translucent turtle gray-green with four pairs of feathery swimming legs. In the initial stage, the crustacean is barely visible to the naked eye, but in the adult state it can reach 4-6 mm. It is very mobile, floats freely, but prefers to accumulate in the midst of plants. Attacking fish, carp eater bites into the skin, bites through it and sucks blood. From biting it on the body of the fish produced wounds that often become a gateway for infection. Destroy carp eating mechanically, removing from the aquarium affected fish and removing the parasite with tweezers. This method is not easy, but the application in the General aquarium chemicals against argulus practically excluded, because he dies at the doses that are dangerous to fish. In order to prevent the carp eater from entering the aquarium, it is necessary to carefully check the composition of live food caught from natural reservoirs.