The world&rsquos first sea cucumbers conservation reserve is being set up in Lakshadweep and will be spread across a 239 km² area. And that's good news. Here's why. Their numbers have been declining at an alarming rate thanks to the huge demand for sea cucumbers in places like China, Southeast Asia and Japan where it's considered a delicacy. They are also believed to have medicinal properties, and are used in traditional Chinese medicine.