| chemical contaminants, health indicators, and reproductive biomarker responses in fish from the colorado river and its tributaries. | common carp (cyprinus carpio), black bass (micropterus spp.), and channel catfish (ictalurus punctatus) were collected from 14 sites in the colorado river basin (crb) to document spatial trends in accumulative contaminants, health indicators, and reproductive biomarkers. organochlorine residues, 2,3,7,8-tetrachlorodibenzo-p-dioxin-like activity (tcdd-eq), and elemental contaminants were measured in composite samples of whole fish, grouped by species and gender, from each site. selenium (se) and ... | 2007 | 17418376 |
| estimating mercury exposure of piscivorous birds and sport fish using prey fish monitoring. | methylmercury is a global pollutant of aquatic ecosystems, and monitoring programs need tools to predict mercury exposure of wildlife. we developed equations to estimate methylmercury exposure of piscivorous birds and sport fish using mercury concentrations in prey fish. we collected original data on western grebes (aechmophorus occidentalis) and clark's grebes (aechmophorus clarkii) and summarized the published literature to generate predictive equations specific to grebes and a general equatio ... | 2015 | 26449260 |
| changes in fish diets and food web mercury bioaccumulation induced by an invasive planktivorous fish. | the invasion, boom, collapse, and reestablishment of a population of the planktivorous threadfin shad in clear lake, california, usa, were documented over a 20-year period, as were the effects of changing shad populations on diet and mercury (hg) bioaccumulation in nearshore fishes. threadfin shad competitively displaced other planktivorous fish in the lake, such as inland silversides, young-of-year (yoy) largemouth bass, and yoy bluegill, by reducing zooplankton abundance. as a result, all thre ... | 2008 | 19475926 |
| spatiotemporal trends in fish mercury from a mine-dominated ecosystem: clear lake, california. | clear lake, california, usa, receives acid mine drainage and mercury (hg) from the sulphur bank mercury mine, a u.s. environmental protection agency (u.s. epa) superfund site that was active intermittently from 1873 to 1957 and partially remediated in 1992. mercury concentrations were analyzed primarily in four species of clear lake fishes: inland silversides (menidia beryllina, planktivore), common carp (cyprinus carpio, benthic scavenger/omnivore), channel catfish (ictalurus punctatus, benthic ... | 2008 | 19475924 |
| mercury in sport fish from the sacramento-san joaquin delta region, california, usa. | total mercury (hg) concentrations were determined in fillet tissue of sport fish captured in the sacramento-san joaquin river delta and surrounding tributaries, a region particularly impacted by historic gold and mercury mining activity. in 1999 and 2000, mercury concentrations were measured in 767 samples from ten fish species. largemouth bass (micropterus salmoides), the primary target species, exhibited a median hg concentration of 0.53 mug g(-1) (n=406). only 23 largemouth bass (6%) were bel ... | 2008 | 18063015 |