Very close to the shore, south of Sanur and close to the mouth of Benoa Harbour, is Pulau Serangan (Turtle Island). At low tide you can actually walk across to the island. Here turtles are captured and fattened in pens before being sold for village feasts. Turtles are now being protected on the west coast of Bali due to dwindling numbers and tourists are advised to refrain from eating any turtle meat or buying products made from turtles.
http://balipurnama.com/bali-tour-turtleisland-tour.php