The new report, published in Fisheries, was conducted by a U.S. Geological Survey-led team of scientists from the United States, Canada and Mexico, who examined the status of continental freshwater and diadromous (those that migrate between rivers and oceans) fish. "Freshwater fish have continued to decline since the late 1970s, with the primary causes being habitat loss, dwindling range and introduction of non-native species," said Mark Myers, director of the USGS. "In addition, climate change may further affect these fish."
The groups of fish most at risk are the highly valuable salmon and trout of the
A threatened sicklefin redhorse from the Tennessee River. Photo courtesy of Steve Fraley, North Carolina Wildlife Resources Commission -- from the US Geological Survey web page