title: Selenium impacts on razorback sucker, Colorado River, Colorado I. Adults.
abstract: Adult razorback sucker (Xyrauchen texanus) were exposed to various selenium concentrations in ponds and isolated river channels of the Colorado River near Grand Junction, CO, to determine effects on their growth and residue accumulation over an 11-month period. Adults at Horsethief ponds were fed a commercial diet, whereas fish at Adobe Creek channel and North Pond foraged on natural food items. Selenium concentrations at Horsethief were 2.2 microg/L in water, 0.1-1.4 microg/g in sediment, and 2.3-3.1 microg/g in food organisms (1.1 microg/g in commercial fish food), at Adobe Creek were 3.8 microg/L in water, 0.5-2.1 microg/g in sediment, and 4-56 microg/g in food organisms, and at North Pond were 9.5 microg/L in water, 7-55 microg/g in sediment, and 20-81 microg/g in food organisms. The selenium concentrations in muscle plugs from adults at Adobe Creek (11.7 microg/g, SD = 0.4, n = 6) and North Pond (16.6 microg/g, SD = 1.0, n = 6) were greater than at Horsethief (4.5 microg/g, SD = 0.2, n = 6). During a depuration period adults from Adobe Creek and North Pond lost 1-2% of their selenium burden in 32 days and 14-19% in 66 days. Selenium accumulated in razorback sucker above toxic thresholds reported in other studies, yet those residues were less than those reported in muscle plugs of 40% of wild razorback sucker caught in the Green River, Utah.
authors.affiliation: US Geological Survey, Columbia Environmental Research Center, Field Research Station, 31247 436th Avenue, Yankton, SD 57078-6364, USA.
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Hamilton
authors.forename: Kathy M
authors.initials: KM
authors.lastname: Holley
authors.forename: Kevin J
authors.initials: KJ
authors.lastname: Buhl
authors.forename: Fern A
authors.initials: FA
authors.lastname: Bullard
authors.forename: L
authors.initials: L
authors.lastname: Ken Weston
authors.forename: Susan F
authors.initials: SF
authors.lastname: McDonald
mesh_terms: D000375:Aging / Q000502:physiology; D000821:Animal Feed / Q000032:analysis; D000818:Animals; D003120:Colorado; D005399:Fishes / Q000254:growth & development / Q000502:physiology*; D020387:Food Chain; D005618:Fresh Water / Q000032:analysis; D019015:Geologic Sediments / Q000032:analysis; D007287:Inorganic Chemicals / Q000032:analysis; D007814:Larva / Q000378:metabolism; D018482:Muscle, Skeletal / Q000378:metabolism; D010063:Ovum / Q000378:metabolism; D010316:Particle Size; D012643:Selenium / Q000493:pharmacokinetics / Q000633:toxicity*; D014018:Tissue Distribution; D015048:Zooplankton / Q000737:chemistry
chemical_list: D007287:Inorganic Chemicals; D012643:Selenium