Several U.S. research teams report reproductive problems in Gulf Coast fish that periodically encounter oxygen at concentrations as low as those in so-called dead zones (SN: 6/5/04, p. 360: Dead ...

Using the maximum size and mean size at first maturity of over 200 fish populations in 133 species of fishes, Chinese and Canadian researchers indirectly estimated the ratio of oxygen consumption of ...

The hybrid freshwater fish actually reproduces exclusively female clones, doing so for much longer than scientists thought ...

WASHINGTON — An all-female freshwater fish species called the Amazon molly that inhabits rivers and creeks along the Texas-Mexico border is living proof that sexual reproduction may be vastly ...

Low oxygen levels in coastal waters interfere with fish reproduction by disrupting the fishes' hormones, a marine scientist has found. Incidents of seasonal low levels of oxygen, known as hypoxia, ...

Polar fish experience lower mortality than tropical fish, allowing them to delay reproduction until later in life when they are larger and can produce more eggs, according to a study by Mariana ...

The ability of fish to breed has been drastically affected, a study reveals, by 'gender bending' chemicals which are washed into rivers and oceans as a result of human activities. The ability of fish ...

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 ...