Roach rarely grow larger than 35 centimeters. They are found in stationary as well as moving water. Roach swim in schools which forage in the vicinity of vegetation (reed, rush), therefore shallow waters, but also in deeper open water. They are true omnivores. Young roach eat mostly water fleas while older specimen eat small snails, zebra mussels, insect larvae, worms and crustaceans. They use the teeth in their throat to crack open shellfish. Adult roach eat mainly plant material, such as algae and detritus.