Lack of oxygen stunts fish reproduction

By Sarah Webb, 15:57 PM April 15, 2008

Seasonal hypoxia, when dissolved oxygen concentrations in water drop below 2 milligrams per liter, is a normal summer occurrence in estuaries. Over the past 20 years, however, pollution has increased the severity and frequency of hypoxia in waters worldwide. That trend could put a crimp in the reproductive capacity of coastal fish, new research shows.

Earlier laboratory studies indicated that in species that can survive hypoxia, reproduction shuts down (SN: 3/1/03, p. 132). Peter Thomas and h...

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