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U.S. Geological Survey

Ultrasonic and endoscopic examination of Missouri River sturgeons has been shown effective for sex and reproductive stage determination (Wildhaber et al., 2005; Bryan et al., in press; Wildhaber et al., in press). In the application of both methodologies, sturgeon are inverted and submerged in water (Fig. 1 and 2). Sturgeon are docile enough in the inverted position that anesthesiology is not needed. During ultrasonic examination the entire body cavity is scanned using the probe (Fig. 1). During endoscopic examination, the vent area is positioned out of the water and the probe is inserted into the gonoduct (Fig. 2). The gonoduct is similar in both sexes, starting from the urogenital pore it forks into two long...
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