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7/14/2009 5:02:31 PM
Creation date
5/17/2009 11:28:21 PM
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UCREFRP
UCREFRP Catalog Number
7864
Author
Modde, T. and E. J. Wick.
Title
Investigations Of Razorback Sucker Distribution, Movements And Habitats Used During Spring In The Green River, Utah.
USFW Year
1997.
USFW - Doc Type
Recovery Program Project No. 49,
Copyright Material
NO
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<br />averaged 67%, whereas survival in backwater sites averaged 40%. Both growth and <br />survival was low in Old Charley Wash. A net loss in weight occurred among all fish in <br />backwater cages. Conversely, gains in weight occurred in two of the three wetland <br />sites, with a loss in weight occurring in fish in one of the Old Charley Wash cages (no <br />fish survived in the other cage in Old Charley Wash). <br /> <br />Competition experiments in 1993 resulted in extremely low razorback sucker <br />survival in both larval and juvenile comparisons. Larval razorback sucker and red <br />shiners were counted into buckets for transfer to cages already in place at Old Charley <br />Wash. In the buckets containing a mixture of red shiners and razorback sucker larvae, <br />100% of the larvae were consumed by the red shiner. No additional larval razorback <br />sucker were available for experimentation so this portion of the study was discontinued. <br />The juvenile razorback sucker experiment was initiated 29 July and terminated 26 <br />August, 1993. Similarly, low survival of juvenile razorback sucker occurred in cages in <br />Old Charley Wash (Table 4). Only one juvenile razorback sucker survived the length of <br />the experiment representing 0.33% treatment survival. Conversely, red shiners survival <br />was high in two of the three cages averaging 66.7%. The single razorback sucker was <br />7 mm greater than the average size stocked and average red shiner total length was <br />7.6 mm greater than the average size stocked. <br /> <br />DISCUSSION <br /> <br />Growth experiments in this study provided limited information on the relationship <br />of wetlands to the growth and survival of early life stages of razorback sucker. Growth <br />and survival in two of three wetlands were much higher than all backwater sites tested <br />in 1991. Mortality of fish in Old Charley Wash was determined to be caused by <br />bacterial septicemia (USFWS, Fort Morgan Fish Health Laboratory). Field observations <br />noted that fish in Old Charley Wash had the heaviest infestation of Lemea sp. among <br />all wetland or backwater replicates. Tyus and Karp (1989, 1990) suggested that <br />emergence of razorback sucker larvae from spawning sites during peak runoff indicated <br />a link between floodplain habitat and nursery habitat. Modde et al. (1996) supported <br />the linkage of floodplain habitat with recruitment by correlating the number of small <br />adult razorback sucker collected in the middle Green River with previous high flow <br />events. Successful recruitment of many species occupying floodplain habitat has been <br />linked to high flow events in both tropical and temperate river systems (Welcomme <br />1985). Since the completion of this study, Fish and Wildlife Service personnel collected <br />eleven wild yearling razorback sucker (250-370 mm total length) in the Leota Pond <br />complex in 1994 (U.S. Fish and Wildlife Service, Vernal, unpublished data), and 73 <br />age-O juvenile razorback sucker in Old Charley Wash in 1995 and 1996 (Modde 1996, <br />USFWS unpublished data). These fish were spawned during high water years of 1993, <br />1995, and 1996 (peak flows at Jensen exceeding 566 m3/s). The occurrence of age-O <br />and subadult life stages in wetland habitat, together with high invertebrate production <br />(Mabey 1993) and rapid growth capabilities reported by Osmundson and Kaeding <br />(1989), supports the contention~of Tyus and Karp (1990), Modde et al. (1995), and <br />Modde et al. (1996) that floodplain habitat is important nursery environment for <br />razorback sucker. <br /> <br />26 <br />
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