Marine turtle diets vary depending upon the species. They are mostly carnivorous or omnivorous and feast on anything from seaweed to jellyfish; including squid, barnacles, sponges, fish, crabs and sea anemones. Green Turtles are carnivorous when they are juveniles and when they’re adults become herbivores eating seagrasses and algae
Marine Turtles are found mainly in tropical and sub-tropical ocean and coastal habitats including coral reefs, seagrass beds, mangrove forests and nesting beaches. Australia has some of the largest Marine Turtle nesting areas in the Indo-Pacific region, including the only nesting populations of the Flatback Turtle. Of the seven species of marine turtles in the world, six occur in Australian waters:
Marine turtles take 20 and 30 years to mature and remain reproductively active for around 10 years. Males and females mate near their nesting beach, which is the same nesting grounds where they were born. Whilst males never leave the sea, females come ashore to lay their eggs. Each female can lay 2-6 clutches of eggs (each with 65-180 eggs) in a single nesting season. Nest temperature determines the sex of the hatchlings; warmer nests produce females and cooler nests produce males. The incubation time for most marine turtles is 45 to 70 days and once the hatchlings are ready to emerge they use a carbuncle (temporary egg tooth) to help break open the shell. Young turtles take three to seven days to dig their way to the surface and usually wait until night to emerge from the nest and head to the water in groups.
Many species migrate for thousands of kilometres, even crossing entire oceans to make their way from feeding grounds to mating grounds. Mysteriously, Marine Turtles are rarely observed during the “lost years” - the time between hatching and when they return to coastal areas as mature adults decades later,