fisheries

Three Dams Coming Out: Cold Water Fisheries Will Benefit

At a meeting last week, city and county commissioners voted to remove the Boardman, Brownbridge, and Sabin Dams while keeping the Union Street dam, all in Grand Traverse County.

On April 9, 2009, the Traverse City Council and the Grand Traverse County Board of Commissioners met in a joint session to act on the recommendations of the Implementation Team and the Boardman Rivers Dam Committee (BRDC).  After several presentations, public comments and discussion the Council and the Commissioners approved the removal of the three dams.

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Assessing Influcence of Hydrology, Physiochemistry, and Habitat on Stream Fish Assemblages Across a Changing Landscape

Source: 
Journal of the American Water Resources Association
Volume: 
45-1
Year: 
2009
Abstract: 

We evaluated the impact of land cover on fish assemblages by examining relationships between stream hydrology, physicochemistry, and instream habitat and their association with fish responses in streams draining 18 watersheds of the Lower Piedmont of western Georgia. Several important relationships between land use and physicochemical, hydrological, and habitat parameters were observed, particularly higher frequency of spate flows, water temperatures, and lower dissolved oxygen (DO) with percentage impervious surface (IS) cover, higher habitat quality with percentage forest cover, and elevated suspended solid concentrations with percentage pasture cover. Fish assemblages were largely explained by physicochemical and hydrological rather than habitat variables. Specifically, fish species diversity, richness, and biotic integrity were lower in streams that received high frequency of spate flows. Also, overall fish assemblage structure as determined by nonmetric multidimensional scaling was best described by total dissolved solids (TDS) and DO, with high TDS and low DO streams containing sunfish-based assemblages and low TDS and high DO streams containing minnow-based assemblages. Our results suggest that altered hydrological and physicochemical conditions, induced largely by IS, may be a strong determinant of fish assemblage structure in these lowland streams and allow for a more mechanistic understanding of how land use ultimately affects these systems.

Author(s): 

Brian S. Helms, Jon E. Schoonover, and Jack W. Feminella 

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Demolish It and They Will Come: Estimating the Economic Impacts of Restoring A Recreational Fishery

Source: 
Journal of the American Water Resources Association
Volume: 
44 (6)
Year: 
2008
Abstract: 

This paper presents the results of an ex post survey of recreational anglers for the lower Kennebec River, post-Edwards Dam removal. To the best of our knowledge, this study represents one of the first ex post analyses of fisheries restoration from dam removal. We find significant benefits have accrued to anglers using the restored fishery. Specifically, anglers are spending more to visit the fishery, a direct indication of the increased value anglers place on the improved fishery. Anglers are also willing to pay for increased angling opportunities on the river. These findings have policy implications for other privately owned dams that are currently undergoing relicensing and ⁄ or dam removal considerations. Our findings may also hold implications for fisheries that have deteriorated due to historic dam construction.  

Author(s): 

Robbins, Jesse Lance and Lynne Y. Lewis

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Instream Flow Assessment Methods: Guidance for Evaluting Instream Flow Needs in Hydropower Licensing

Volume: 
1000554
Year: 
2000
Abstract: 

Most recent instream flow studies used one of three approaches. (1) PHABSIM remains popular but has major flaws, including the failure to establish and appropriate spatial resolution and use it throughout the method: a decision variable, Weighted Usable Area, that lacks biological meaning; and lack of a sound conceptual basis, which encourages ad hoc and poorly conceived methods for applying the approach. Some of PHABSIM

Author(s): 

EPRI (Electric Power Research Institute)

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