Joseph E. Hightower

Effect of Water Quality on Hatching Success of Blueback Herring Eggs in the Chowan River Basin, North Carolina

River herring (alewife [Alosa pseudoharengus] and blueback herring [A. aestivalis]) within the Albemarle Sound basin in North Carolina once supported large commercial fisheries that have declined dramatically since the 1970s. Overfishing, poor water quality, and habitat loss have been suggested as causes of this decline. The objective of this study was to examine the effect of water quality on the hatching success of blueback herring eggs in the Chowan River, a major tributary to Albemarle Sound. We combined eggs and milt obtained from running-ripe fish and placed incubators containing...

Year
2007

Preliminary Assessment of an Alaska Steeppass Fishway on a North Carolina Blackwater Creek

Despite the large number of low-head dams on North Carolina streams and rivers, fishways have rarely been used to restore access to habitat upstream of dams. The goal of this study was to determine the use of a prefabricated Alaska steeppass fishway installed at a low-head dam on Black Creek, a blackwater tributary of the Neuse River near Smithfield, North Carolina. Between 21 February and 2 June 2003 study period, the ladder was used by 949 gizzard shad (Dorosoma cepedianum), 2 American shad (Alosa sapidissima), and 1 golden shiner (Notemigonus crysoleucas). Upstream passage of gizzard...

Year
2004