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IMAS @utas surveys off Tasmania's East Coast reveal rise in invasive urchin numbers from 11 million to 18m since 2001/02. Urchin barrens created by overgrazing kelp now cover 15 per cent of reefs 4-40m, up from 3 per cent bit.ly/2Uo23zb imas.utas.edu.au/urchins

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