Jan Jeffrey Hoover

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The lower portion of the Sacramento River, California, has been highly engineered to protect low-lying surrounding communities from annual flood events. While engineered floodplains have provided adequate protection for the surrounding communities, there remain unintended consequences to migratory fish that become stranded during high flow events. In April(More)
BACKGROUND: The history and biology of silver carp in North America have been summarized previously by Robison and Buchanan (1988), Pflieger (1997), and Ross (2001). In 1973, the species was brought to the United States from Asia by a private fish farmer to control algae blooms in Arkansas aquaculture ponds. By the late 1970s, silver carp were cultured or(More)
Harvesting of liver samples for toxicologic and other laboratory analyses is frequently undertaken in free-ranging fish to evaluate accumulations of various pollutants and chemicals. However, commonly used, lethal techniques for collecting liver tissues are unacceptable when dealing with protected species. We report the use of a nonlethal, single-entry,(More)
Abundance estimates are essential for estimating the viability of populations and the risks posed by alternative management actions. An effort to estimate abundance via a repeated mark-recapture experiment may fail to recapture marked individuals. We present a framework for obtaining lower bounds on abundance in the absence of recaptures for both panmictic(More)
Hydraulic and vertical barriers to Silver Carp dispersal can be developed if maximum burst speeds and jump characteristics are quantified. Using videography of jumping fish (N = 27), representing four populations of Silver Carp, burst speeds were estimated using direct time-lapse technique as 5.30-8.39 m/s, equivalent to 8.16-11.30 body lengths per sec(More)
PURPOSE: Empirical swim speed data are needed to manage invasive bigheaded or “Asian” carps (Figure 1). However, such data are limited within the scientific literature. The large size and active temperament of the carp combined with current legislative restrictions concerning transport, make them difficult to acclimatize and test in traditional laboratory(More)