| life history and habitat analysis of the eye fluke diplostomum spathaceum (trematoda: diplostomatidae) in utah. | diplostomum spathaceum which is widespread throughout utah in desert, mountain valley, and high alpine lakes, causes a disease known as diplostomatosis or eye fluke disease. snails (756) were examined and two species, lymnaea stagnalis and l. palustris were positive for d. spathaceum. examination of 838 fish, which included 19 species, revealed 10 species (salmo trutta, catostomus discobulus, salmo clarki, micropterus salmoides, catostomus platyrhynchus, salmo gairdneri, gila atraria, catostomus ... | 1977 | 864559 |
| glochidiosis of salmonid fishes. i. comparative susceptibility to experimental infection with margaritifera margaritifera (l.) (pelecypoda: margaritanidae). | this is the first report on the susceptibility of salmonid fishes to infection with the glochidia of the freshwater mussel margaritifera margaritifera using known numbers of parasites under controlled conditions. the relative susceptibility of six species of salmonid fish, 20 to 80 mm in total length, to glochidiosis was determined by exposing fish individually to different numbers of parasites and plotting mortalities against these exposure levels at 70 days postexposure and also against the nu ... | 1977 | 886411 |
| permeability of trout erythrocytes to nonelectrolytes. | using a densimeter technique, a kinetic analysis was made, employing both entrance and exit studies, of the permeability of erythrocytes of brook trout (salvelinus fontinalis), rainbow trout (salmo gairdneri), german brown trout (salmo trutta) and cutthroat trout (salmo clarki) to glycerol, ethylene glycol, thiourea and urea. all of the data indicate that these four nonelectrolytes cross the membrane of the erythrocytes of these four species of fishes by simple diffusion only. | 1976 | 974163 |
| metacercariae of diplostomum spathaceum in the eyes of fishes from yellowstone lake, wyoming. | fish were collected from yellowstone lake, wyoming (usa). metacercariae of diplostomum spathaceum was found in the lens of 11 of 12 longnose suckers (catostomus catostomus). the mean number of metacercariae per sucker was 59 and the average age of the fish was 11.6 yr. there was no correlation between age and intensity of parasites (r = 0.24). of 10 cutthroat trout (salmo clarki) examined, there were metacercariae present in six. the metacercariae were found outside of the lens tissue in the tro ... | 1989 | 2915395 |
| nitrate toxicity to aquatic animals: a review with new data for freshwater invertebrates. | published data on nitrate (no3-) toxicity to freshwater and marine animals are reviewed. new data on nitrate toxicity to the freshwater invertebrates eulimnogammarus toletanus, echinogammarus echinosetosus and hydropsyche exocellata are also presented. the main toxic action of nitrate is due to the conversion of oxygen-carrying pigments to forms that are incapable of carrying oxygen. nitrate toxicity to aquatic animals increases with increasing nitrate concentrations and exposure times. in contr ... | 2005 | 15667845 |
| molecular and morphological analysis of myxobolus spp. of salmonid fishes with the description of a new myxobolus species. | while investigating the parasite fauna of wild coho salmon. oncorhynchus kisutch (walbaum, 1792), histological examination provided evidence of a new species of myxobolus (myxozoa: myxosporea) infecting nerves of skeletal muscle. spores were morphologically similar to those of the intramuscular myxobolus insidiosus wyatt and pratt, 1963, both having pyriform spores with clavate polar capsules. however, the former developed exclusively in the nerves of skeletal muscle rather than in myocytes. we ... | 2008 | 19127969 |
| hybridization rapidly reduces fitness of a native trout in the wild. | human-mediated hybridization is a leading cause of biodiversity loss worldwide. how hybridization affects fitness and what level of hybridization is permissible pose difficult conservation questions with little empirical information to guide policy and management decisions. this is particularly true for salmonids, where widespread introgression among non-native and native taxa has often created hybrid swarms over extensive geographical areas resulting in genomic extinction. here, we used parenta ... | 2009 | 19324629 |
| a novel member of the family hepeviridae from cutthroat trout (oncorhynchus clarkii). | beginning in 1988, the chinook salmon embryo (chse-214) cell line was used to isolate a novel virus from spawning adult trout in the state of california, usa. termed the cutthroat trout (oncorhynchus clarkii) virus (ctv), the small, round virus was not associated with disease, but was subsequently found to be present in an increasing number of trout populations in the western usa, likely by a combination of improved surveillance activities and the shipment of infected eggs to new locations. here ... | 2011 | 21458509 |
| correlation of environmental attributes with histopathology of native yellowstone cutthroat trout naturally infected with myxobolus cerebralis. | infection by the invasive parasite myxobolus cerebralis (causing whirling disease in salmonids) is strongly influenced by a stream's physico-chemical characteristics, which might affect host pathology. we examined whether environmental variables of a m. cerebralis-positive tributary to yellowstone lake, yellowstone national park, u.s.a., correlated with the histopathology of naturally infected native cutthroat trout oncorhynchus clarkii bouvieri. host inflammatory response and cranial cartilage ... | 2011 | 21516975 |
| flow regime, temperature, and biotic interactions drive differential declines of trout species under climate change. | broad-scale studies of climate change effects on freshwater species have focused mainly on temperature, ignoring critical drivers such as flow regime and biotic interactions. we use downscaled outputs from general circulation models coupled with a hydrologic model to forecast the effects of altered flows and increased temperatures on four interacting species of trout across the interior western united states (1.01 million km(2)), based on empirical statistical models built from fish surveys at 9 ... | 2011 | 21844354 |
| the influence of changing prey availability on the prevalence of diphyllobothrium in river otters from yellowstone national park. | parasite prevalence in predatory mammals is influenced by numerous factors including diet, sex, season, and habitat. we examined the effect of such factors on the prevalence of gastrointestinal helminths in north american river otters ( lontra canadensis ) in yellowstone lake, yellowstone national park. otters in this ecosystem have recently experienced a decline in their main prey, yellowstone cutthroat trout ( oncorhynchus clarkii bouvieri), and have, in turn, increased consumption of alternat ... | 2015 | 25192057 |
| acute toxicity of zinc to several aquatic species native to the rocky mountains. | national water-quality criteria for the protection of aquatic life are based on toxicity tests, often using organisms that are easy to culture in the laboratory. species native to the rocky mountains are poorly represented in data sets used to derive national water-quality criteria. to provide additional data on the toxicity of zinc, several laboratory acute-toxicity tests were conducted with a diverse assortment of fish, benthic invertebrates, and an amphibian native to the rocky mountains. tes ... | 2012 | 21811884 |
| prebiotic supplementation has only minimal effects on growth efficiency, intestinal health and disease resistance of westslope cutthroat trout oncorhynchus clarkii lewisi fed 30% soybean meal. | prebiotics have successfully been used to prevent infectious diseases in aquaculture and there is an increasing amount of literature that suggests that these products can also improve alternative protein utilization and digestion. therefore, the objective of this study was to examine whether prebiotic supplementation increased the growth efficiency, intestinal health, and disease resistance of cutthroat trout fed a high level of dietary soybean meal. to achieve this objective, juvenile westslope ... | 2015 | 26379662 |
| linkage relationships reflecting ancestral tetraploidy in salmonid fish. | fifteen classical linkage groups were identified in two salmonid species (salmo trutta and salmo gairdneri) and three fertile, interspecific hybrids (s. gairdneri x salmo clarki, salvelinus fontinalis x salvelinus namaycush and s. fontinalis x salvelinus alpinus) by backcrossing multiply heterozygous individuals. these linkage relationships of electrophoretically detected, protein coding loci were highly conserved among species. the loci encoding the enzymes appeared to be randomly distributed a ... | 2013 | 3623080 |
| electrophoretic variation in muscle lactate dehydrogenase in snake valley cutthroat trout, salmo clarki subsp. | 1. electrophoretic variation observed in muscle a group lactate dehydrogenase in snake valley cutthroat trout (salmo clarki subsp.) suggested the presence of two variant alleles at the a1 locus and a null allele at the a2 locus. 2. the taxonomic status of the snake valley cutthroat trout was reviewed. | 1989 | 318316 |
| food chain model based on field data to predict westslope cutthroat trout (oncorhynchus clarkii lewisi) ovary selenium concentrations from water selenium concentrations in the elk valley, british columbia. | previous studies conducted in the elk river watershed showed that selenium concentrations are higher in aquatic biota in lentic compared to lotic habitats of the system having similar water selenium concentrations. studies have also shown that water selenium concentrations have increased over time (∼10% per year) and recent annual average concentrations have ranged up to 0.044 mg/l in areas downstream from mine discharges. for the present study, trophic transfer of selenium was characterized in ... | 2011 | 22189838 |
| modeling predicts that redd trampling by cattle may contribute to population declines of native trout. | unrestricted livestock grazing can degrade aquatic ecosystems, and its effects on native vertebrate species are generally mediated by changes to physical habitat. recently, high estimated rates of cattle trampling on artificial redds within federal grazing allotments in southwestern montana, usa, has raised concern that direct mortality from trampling may contribute to imperilment of native westslope cutthroat trout (oncorhynchus clarkii lewisi). to explore the implications of cattle trampling, ... | 2010 | 20597282 |
| acute toxicity of cadmium, lead, zinc, and their mixtures to stream-resident fish and invertebrates. | the authors conducted 150 tests of the acute toxicity of resident fish and invertebrates to cd, pb, and zn, separately and in mixtures, in waters from the south fork coeur d'alene river watershed, idaho, usa. field-collected shorthead sculpin (cottus confusus), westslope cutthroat trout (oncorhynchus clarkii lewisi), two mayflies (baetis tricaudatus and rhithrogena sp.), a stonefly (sweltsa sp.), a caddisfly (arctopsyche sp.), a snail (gyraulus sp.), and hatchery rainbow trout (oncorhynchus myki ... | 2012 | 22488500 |