Is a green sea turtle a herbivore carnivore or an omnivore?

Adult Green Sea Turtles are herbivores feeding on various species of algae, sea grass, and seaweed. They spend most of their time in coastal waters and lagoons with lush seagrass beds. Juveniles, on the other hand, are carnivorous and feed on jellyfish, crustaceans, and other invertebrates. After emerging from the nest, hatchlings swim to offshore areas, where they are believed to live for several years, feeding close to the surface on a variety of pelagic plants and animals. Once the juveniles reach a certain age, they travel to nearshore coral reefs where limu is plentiful and become almost exclusively herbivores.

In Hawaii and off Florida, green turtles have been known to often eat jellies and octopus. How often this happens is unknown to researchers. (2014) REEFANNIE