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Last modified
7/14/2009 5:02:30 PM
Creation date
5/22/2009 4:52:49 PM
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UCREFRP
UCREFRP Catalog Number
7402
Author
Nesler, T. P.
Title
Aquatic Nongame Research, Endangered Fishes Investigations.
USFW Year
1989.
USFW - Doc Type
Fort Collins, Colorado.
Copyright Material
NO
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<br />completely unidentifiable. Corixidae were the most common other item consumed <br />by bass with or without fish prey in their stomachs. Green sunfish consumed <br />mostly Corixidae and Chironomidae. Black crappie consumed mostly zooplankton <br />(Daphnia and Bosmina spp.), and Corixidae. <br />In 1988, 17 of the 22 largemouth bass sampled (77%) had consumed fish <br />prey. Thirty-five prey fish were observed in the 17 bass stomachs. These <br />included 5 red shiners, 1 fathead minnow, 1 sand shiner (Notropis stramineus), <br />1 Gila sp., 2 unidentifiable cyprinids, and 25 other unidentifiable fish. <br />Other frequent items found in bass stomachs included eorixidae and <br />Chironomidae. Only 1 green sunfish out of 63 (1.6%) had consumed fish prey <br />(red shiner). Common prey items in green sunfish stomachs included Corixidae, <br />Chironomidae, and Copepoda. Other less common food items included <br />Ephemeroptera, Tipulidae, eoleoptera, and terrestrial insects. One of the 4 <br />bluegill had consumed fish prey (unidentifiable species). Other food items <br />included in bluegill stomachs included terrestrial insects, Corixidae, and <br />Chironomidae. <br />Other fish species sampled in standardized seine hauls were also <br />identified (Larval Fish Laboratory, eolorado State University, personal <br />communication). In 1987, fish species collected in order of abundance <br />included fathead minnows (67%), red shiner (21%), Gila sp. (7%), sand shiner <br />(3%), bluehead sucker (Catostomus discobolus) (<1%), flanne1mouth sucker <br />(<1%), carp (Cyprinis carpio) (<1%), speckled dace (<1%), and ColQrado <br />squawfish (<1%). In 1988, fish species collected in order of abundance <br />included fathead minnows (75%), red shiner (17%), sand shiner (6%), Gila sp. <br />(<1%), carp (<1%), bluehead sucker (<1%), white sucker (Catostomus commersoni) <br />(<1%), flannelmouth sucker (<1%), speckled dace (<1%), and Colorado squawfish <br />(<1%). All gamefish species collected comprised less.than 0.5% of the total <br />seine fish samples in both years. <br />Channel catfish collected in seine samples ranged from 40-80 mm total <br />length. Black bullhead ranged from 30-160 mm total length, but 71% of the <br />bullheads sampled were 30-50 rom in length. Seven of the 14 channel catfish <br />collected had empty stomachs. The remaining channel catfish had consumed <br />terrestrial insects, Ephemeroptera, Trichoptera, and Chironomidae. Only 8 of <br />the 68 black bullheads (12%) had consumed fish prey, but all 8 fish ingested <br /> <br />22 <br />
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