Potomac 'intersex' fish worry scientists
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Scientists say abnormal "intersex" fish, with both male and female characteristics, have been discovered in the Potomac River and its tributaries across the Capitol Region, raising questions about how contaminants are affecting millions of people who drink tap water there.
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A rare reef fish called the humphead wrasse should be guarded from the trade that is threatening its future, conservation agencies have claimed.
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By Kathirasen  THERE'S something fishy going on in rivers and seas.  An increasing number of male fish are changing sex midway to become female. And they don't have to pay exorbitant sums of money to some surgeon somewhere to do it either.
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It's a mystery even for researchers at the Smithsonian Institution:
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With spring approaching, Virginia scientists are planning a more comprehensive effort to find the cause of the mysterious fish kills in the Shenandoah River and its tributaries.
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The U.S. Fish and Wildlife Service,  accused of letting a political appointee meddle in the science  of endangered species, said on Friday it could reverse eight  decisions if it finds they were inappropriately influenced by  political concerns.
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A 20-year government effort to restore the population of an endangered native trout in Colorado has made little progress because biologists have been stocking some of the waterways with the wrong fish, a new study says.
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A genetic study sheds light on the mystery of how fish made the move from water to land millions of years ago.
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It hardly seems fair, but water creatures nimble enough to avoid being gobbled up by predators might harm their species more than help, new research suggests.
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U.S. scientists have found a new species of Antarctic fish that are about 13-inches long, thrive in the cold and have an interorbital pit with two openings.
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A parasite that causes trout to swim in circles until they die has been found in two hatcheries in western Maryland, meaning 80,000 fish that would have been stocked in lakes and streams this year will instead be destroyed, an official said Thursday.
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Studying the zebra fish spinal cord, grooming habits of the Barbary macaque and the regional impact of dams.
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Scientists have discovered a fish that imitates the extraterrestrial beast of the âAlienâ series: it possesses a second set of jaws.
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By John McCoy  Ever since they discovered that male South Branch smallmouth bass had started developing female characteristics, scientists have been scratching their heads trying to figure out why.   A recent University of Colorado study might solve at least part of the mystery.
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A tiny fish that no one eats or cares about may tell researchers a lot about the health of Caribbean coral reefs and where to focus conservation efforts.
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Scientists baffled by massive springtime fish kills on the Shenandoah River over several years now have additional confusing information: several hundred dead fish in December.
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Biologists, smarting from research showing that they may have been protecting the wrong fish for decades, are regrouping in their efforts to restore a rare type of trout to Colorado waters.