Pond turtles mostly eat insects, worms or small fish. When the turtles get older, they begin to eat more vegetables and plants. Lettuce, shredded carrots and some fruits such as apples can also become part of their diet.
1 Additional Answer
Some things that pond turtles eat water plants, other plants, insects, worms, shellfish, rhubarb, poison ivy, avocadoes, arthropods and snails.