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Last modified
7/14/2009 5:02:36 PM
Creation date
5/24/2009 7:17:16 AM
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UCREFRP
UCREFRP Catalog Number
9540
Author
Christopherson, K., G. J. Birchell and T. Modde.
Title
Larval Razorback Sucker and Bonytail Survival and Growth in the Presence of Nonnative Fish in the Stipprup Floodplain.
USFW Year
2004.
USFW - Doc Type
Salt Lake City, UT.
Copyright Material
NO
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<br />Water Quality Measurements <br />Water temperature, pH, and dissolved oxygen were monitored over a 24 hour period for <br />multiple days at approximately two week intervals between June 11 and August 6 with a <br /> <br />Hydrolab minisonde. Measurements alternated every other day between each enclosure during <br />the time period. A staff gage was placed at the deepest site in the high-density fish enclosure and <br />checked every few days to monitor maximum depth in the enclosures. Zooplankton was <br />sampled at one-week intervals between May 14 and July 15, 2002. Three samples each were <br />taken from the high-density enclosure, low-density enclosure and outside the enclosures on each <br />sampling date. The plankton net sampled an area of 0.07 m2 and were 80 micron mesh size. <br />Fish stocking and sampling <br />Two densities of razorback sucker and bonytail larvae with approximately equal numbers <br />of nonnative fish were tested (Table 1). The numbers of nonnative fish introduced were based <br /> <br />on densities observed during the Levee Removal study (Birchell et al. 2002). Prior to breaching ~ <br />the levees for the Levee Removal study, the floodplain sites were dry and so the fish populations <br />were reset. The fish assemblage, and relative density, that entered these reset floodplains during <br />the first year of the Levee Removal study was used to test the reset theory in this study. The i <br />high-density enclosure (high for endangered fish larvae) was stocked with 81 fathead minnow <br />(Pimephales promelas), 37 red shiner (Notropis lutrensis), 15 black bullhead (Amierus melas), <br />18 green sunfish (Lepomis cyanellus), and 3 carp (Cyprinus carpio) (154 fish) prior to ~ <br />introducing larval endangered fish. The low-density enclosure (low for endangered fish) <br />received 75 fathead minnow, 42 red shiner, 16 black bullhead, 12 green sunfish and 4 carp (149 <br />fish) also prior to introducing larval razorback (Table 1). The nonnative fish used in the 7 <br />experiment were collected from the Green River and local ponds, and they were of mixed age <br />1 +. <br />1 <br />4 <br />
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