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also flooded the mouths of Little Missouri, Cheyenne and White rivers which may have been <br />suitable habitat for pallid sturgeon prior to impoundment, although they have never been <br />recorded from these tributaries. <br />RPMA 3(Monitoring and Assessment Segments 5 and 6) is an isolated section of river <br />habitat between Fort Randall Dam and Lewis and Clark Reservoir. This reach of the Missouri <br />River receives water from the Niobrara River. Although this reach had habitat which supported <br />pallid sturgeon (Keenlyne 1989), today this section of the Missouri River and the adjoining <br />portion of the lower Niobrara River contains only a stocked population of pallid sturgeon. The <br />population in this reach has been studied intensively (Wanner et al. 2007a; Wanner et al. 2007b) <br />Mississippi River and tributaries (RPMA 5, 6): <br />Downstream from the mouth of the Missouri River (RPMA 4) are RPMA's 5 and 6. <br />Pallid sturgeon are regularly collected in the Mississippi River from its confluence with the <br />Missouri River to near the river's mouth (Hurley et al. 2004b; Sheehan et al. 2000; Sheehan et al. <br />1998; Sheehan et al. 1999). Pallid sturgeon have also been collected in several small tributaries <br />of the Mississippi (Bailey and Cross 1954; Buchanan 1973; Ross 2001), such as the St. Francis <br />River in Arkansas the Big Sunflower River in Mississippi and most notably in the Atchafalaya <br />River in Louisiana (Bailey and Cross 1954; Killgore et al. 2007a). However, pallid sturgeon are <br />not known to use the Ohio River. RPMA 6 is the Atchafalaya River which is separated from the <br />Mississippi River by a river control structure. The river control structure separates pallid <br />sturgeon populations in the Atchafalaya River from those in the rest of the Mississippi River. <br />Life Cycle Stages: