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Published online 2 May 2006 | Nature | doi:10.1038/news060501-1

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Lack of oxygen proves a gender bender

Fish starved of air more likely to turn into boys.

Aquatic 'dead zones', oxygen-depleted areas throughout the world's waterways, are not only suffocating marine life but may also be transforming female fish into males.

There are about 150 significant oxygen-starved patches of water throughout the world, according to a recent United Nations report1.

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