The salt concentration can be twice as much as in sea water. Sea Turtles feed in a variety of ways although all hatchlings are carnivores, eating slow moving animals near the surface. The adults are essentially carnivores though stomach contents often include vegetable matter. Each species has its own food preference but all tend to be opportunistic. Food ranges from bottom dwellers such as crabs to floating jellyfish.
Green turtles are herbivores, feeding on sea grasses, algae and mangrove shoots.
There is some evidence that young Sea Turtles can confuse oil droplets for food and that some adults eat plastic bags mistaking them for jellyfish. Jelly fish, Laganas Bay, Greece. see Threats to Survival section It may take 15-30 years for Marine Turtles to reach sexual maturity. Most species lay about 100 eggs in a flask shaped hole in the sand. From June to August the Loggerhead and Green turtle visit certain beaches of the Mediterranean to nest. The female turtle comes ashore at night, digs her nest and lays about 100 soft shelled eggs, which look similar to ping pong balls.