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Seaweed farming is not restricted to native or naturally occurring seaweeds. Cultivation of other non native species like Kappaphycus alvarezii have been on the rise in the last few years. But a quick study reveals that this particular species is not native to Indian waters and is part of the world’s 100 most invasive species list (according to IUCN). So, why is there still an active encouragement from the government’s side to grow this species? What is the economic model of this seaweed variety? Does its cultivation have long term consequences on the environment? To understand what’s happening on ground, Down to Earth visited several sites across different states of India, including Gujarat, where early trials of non-native varieties like Kappaphycus failed; Tamil Nadu, where the practice has been ongoing for over a decade and Goa, where new sites are being considered. Down to Earth is Science and Environment fortnightly published by the Society for Environmental Communication, New Delhi. We publish news and analysis on issues that deal with sustainable development, which we scan through the eyes of science and environment.