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Movements <br />Analysis of shovelnose sturgeon movements has revealed that these fish are generally <br />sedentary during late summer, fall, and winter months. Sturgeon movements peaked during the <br />spring and early summer of 2001 (April -June) (Figure 1). Beginning April 2, 2001, four of 10 <br />shovelnose sturgeon exhibited coordinated upstream movements averaging 110 km upstream. <br />Fishes 101, 121, and 641 all moved to locations between Fremont and Rogers, Nebraska. Fish <br />161 exhibited the most extreme migration, moving to an area within 7 km of the highway 81 <br />bridge (Columbus). By July 17, 2001, all of these fish had moved back downstream to within 5 <br />km of their initial starting locations. The other six shovelnose sturgeon displayed little movement <br />relative to their counterparts, each remaining within 10 km of their respective release sites <br />throughout 2000 and 2001. <br />Following implantation on May 3, the pallid sturgeon moved downstream approximately <br />1500 m, where it remained for approximately four weeks. Following this sedentary period, fish <br />621 traveled downstream, entering the Missouri River on June 9, 2001 (Figure 1.1). The <br />estimated expiration date for transmitter 621 is January 3, 2003. <br />Movements of shovelnose sturgeon were consistent with previous findings. Quist et al. <br />(1999) found that most shovelnose moved less than 2 km during winter months (November- <br />March). Hurley et al. (1987) found shovelnose sturgeon in the upper Mississippi River were <br />generally sedentary with most movement occurring in May and July. Tews (1994), tracking <br />pallid sturgeon movement in the upper Missouri and Yellowstone Rivers, documented significant <br />migrations during April and May with little movement occurring throughout summer and winter <br />months <br />7 <br />