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OSLO (Reuters) - Valuable mangrove forests that protect coastlines, sustain sealife and help slow climate change are being wrecked by the spread of shrimp and fish farms, a U.N.-backed study showed on Wednesday.

About a fifth of mangroves worldwide have been lost since 1980, mostly because of clearance to make way for the farms which often get choked with waste, antibiotics and fertilizers, according to the study.

Intact mangroves were almost always more valuable than shrimp farms, said its authors, who drew on forestry and conservation expertise from several U.N. organizations.