Take Dams Down and the Fish Will Come scienceline.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from scienceline.org Daily Mail and Mail on Sunday newspapers.
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Upper Delaware Scenic and Recreational River notes a timeless rite of spring, the spawning run of American shad.
An ancient and impressive wildlife migration is occurring in our midst. The spring spawning run of American shad in the Delaware River is a timeless rite of spring that has taken place here for the past 10,000 years.
Determined fish are now swimming 330 miles or more upriver from the ocean, on this last major river on the Atlantic Coast undammed the entire length of its main stem. Some of these 3 to 6-year-old fish have travelled over 12,000-miles at sea during their ocean odyssey, wintering off the Carolinas and venturing north on annual summer feeding forays to the Gulf of Maine and the Bay of Fundy. Most are now completing their final journey.
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Freshwater fish are under threat, with as many as a third of global populations in danger of extinction, according to an assessment.
Populations of migratory freshwater fish have plummeted by 76 per cent since 1970, and large fish those weighing more than 30 kilograms have been all but wiped out in most rivers. The global population of megafish is down by 94 per cent, and 16 freshwater fish species were declared extinct last year.
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The report by 16 global conservation organizations, called The World’s Forgotten Fishes, said that global populations of freshwater fish were in freefall. The problems are diverse and include pollution, overfishing and destructive fishing practices, the introduction of invasive non-native species, climate change and the disruption of river ecologies. Most of the world’s rivers are now d
World s forgotten fishes vital for hundreds of millions of people but one-third face extinction, warns new report panda.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from panda.org Daily Mail and Mail on Sunday newspapers.