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USGS research frontiers on fish at the American Fisheries Society Conference
Date:9/6/2011

habitats is necessary. The USGS, National Park Service and its partners conducted snorkel and habitat surveys in the Elwha River from the headwaters to its mouth in 2007 and 2008. This "riverscape" approach enabled scientists to characterize extent, abundance, age, and community make-up (what species occurred) of Pacific salmonids along almost the entire river. Not surprisingly, the study revealed that species richness was highest below the dams, where anadromous salmonids still have access. It also demonstrated clear differences in habitat along the river because of natural and human-caused factors. This comprehensive approach helped highlight species-specific biological hotspots for example, it showed that nearly two-thirds of federally threatened bull trout occurred near or below the dams. The riverscape approach also helped address linkages between fish and aquatic habitats before dam removal. Such geographically continuous surveys will be vital in evaluating the effectiveness of upcoming dam removal projects at restoring anadromous salmonids. This study, A riverscape approach to assess fish and habitat relationships prior to dam removal on the Elwha River, Washington, will be presented Sept. 7 at 8:15 a.m. in room 608. To learn more, contact Jeff Duda at jduda@usgs.gov or at 206-526-6282; or contact Sam Brenkman at sam_brenkman@nps.gov or at 360-565-3081.

Designing a cookbook for Asian Carp control: The food and feeding behavior of invasive Asian carp may hold the key ingredients to designing a chemical or biological control that could reduce the population of these invaders in the Mississippi River. Asian carp have become a major threat to ecosystems in the Mississippi, Missouri and Ohio Rivers since their introduction in the 1970s. Asian carp filter feed selectively on microscopic algae and plankton, and scientists are exploring the size of preferred food particles and
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Contact: Catherine Puckett
cpuckett@usgs.gov
352-278-0165
United States Geological Survey
Source:Eurekalert

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