first record of neoergasilus japonicus (poecilostomatoida: ergasilidae), a parasitic copepod new to the laurentian great lakes.the parasitic copepod neoergasilus japonicus, native to eastern asia, was first collected from 4 species of fish (fathead minnow, pimephales promelas; largemouth bass, micropterus salmoides; pumpkinseed sunfish, lepomis gibbosus; and yellow perch, perca flavescens) in july 1994 in saginaw bay, lake huron, michigan. further sampling in the bay in 2001 revealed infections on 7 additional species (bluegill, lepomis macrochirus; carp, cyprinus carpio; channel catfish, ictalurus punctatus; goldfish, ...200212197110
morphological, developmental and ecological evidence for a progenetic life cycle in neochasmus (digenea).seven species of fishes, catostomus commersonii (lacépède), etheostoma nigrum rafinesque, micropterus dolomieu lacépède, notemigonus crysoleucas (mitchill), notropis hudsonius (clinton), perca flavescens (mitchill), and percina caprodes (rafinesque) from the st. lawrence river, quebec, canada, were found infected with progenetic specimens of neochasmus spp. in the orbits and/or the body musculature. worms displayed varying degrees of maturation. eggs occupied the entirety of the worm in late sta ...200616696430
mortality of centrarchid fishes in the potomac drainage: survey results and overview of potential contributing lesions and spring mortality events of smallmouth bass micropterus dolomieu and selected other species were first noted in the south branch of the potomac river in 2002. since that year morbidity and mortality have also been observed in the shenandoah and monocacy rivers. despite much research, no single pathogen, parasite, or chemical cause for the lesions and mortality has been identified. numerous parasites, most commonly trematode metacercariae and myxozoans; the bacterial pathogens aer ...201021192549
mercury bioaccumulation and biomagnification in ozark stream ecosystems.crayfish (orconectes spp.), asian clam (corbicula fluminea), northern hog sucker (hog sucker; hypentelium nigricans), and smallmouth bass (smallmouth; micropterus dolomieu) from streams in southeastern missouri (usa) were analyzed for total mercury (hgt) and for stable isotopes of carbon (δ¹³c), nitrogen (δ¹⁵n), and sulfur (δ³⁴s) to discern hg transfer pathways. hgt concentrations were generally lowest in crayfish (0.005-0.112 μg/g dw) and highest in smallmouth (0.093-4.041 μg/g dw), as was δ¹⁵n ...201121868094
persistence of viral rna in fish infected with vhsv-ivb at 15°c and then moved to warmer temperatures after the onset of disease.smallmouth bass, micropterus dolomieu lacepède, bluegill, lepomis macrochirus rafinesque (coppernose strain), koi carp, cyprinus carpio l., and channel catfish ictalurus punctatus (rafinesque), were infected by intraperitoneal injection with viral haemorrhagic septicaemia virus genotype ivb (vhsv-ivb) at 15 °c. when clinical signs of disease developed, one-third of the fish was moved to 20°c and one-third to 25°c. mortality in challenged fish at all three temperatures ranged from 25 to 45% in sm ...201222582793
heterogeneity in levels of serum neutralizing antibodies against viral hemorrhagic septicemia virus genotype ivb among fish species in lake st. clair, michigan, usa.the presence of neutralizing antibodies against viral hemorrhagic septicemia virus (vhsv-ivb) was investigated in sera of 13 fish species collected from lake st. clair, michigan, usa, a vhsv-endemic water body. we tested 297 sera collected may 2004-june of 2010, using a complement-dependent 50% plaque neutralization test (50% pnt). neutralizing antibodies were detected in 23% (67/297) of the samples. the highest overall antibody prevalence (85%, 34/40) and mean positive antibody titer (12,113 ± ...201222493115
transcriptome discovery in non-model wild fish species for the development of quantitative transcript abundance assays.environmental studies increasingly identify the presence of both contaminants of emerging concern (cecs) and legacy contaminants in aquatic environments; however, the biological effects of these compounds on resident fishes remain largely unknown. high throughput methodologies were employed to establish partial transcriptomes for three wild-caught, non-model fish species; smallmouth bass (micropterus dolomieu), white sucker (catostomus commersonii) and brown bullhead (ameiurus nebulosus). sequen ...201627497300
the bass parasites of oneida lake, 80 years later.a survey of largemouth (micropterus salmoides) and smallmouth bass (micropterus dolomieu) parasite communities in oneida lake, new york, was conducted in the summer of 2012 and compared to an earlier survey conducted by van cleave and mueller during the summers of 1929 to 1931. the component helminth communities between surveys were 31% similar in composition for largemouth and 28% similar for smallmouth bass. between species, the component helminth communities were considerably more similar in ...201526001048
circulating androgens are influenced by parental nest defense in a wild teleost fish.while social interactions influence vertebrate endocrine regulation, the dynamics of regulation in relation to specific behaviors have not been clearly elucidated. in the current study, we investigated whether androgens (testosterone) or glucocorticoids (cortisol) play a functional role in aggressive offspring defense behavior in wild smallmouth bass (micropterus dolomieu), a teleost fish with sole paternal care. we measured circulating testosterone and cortisol concentrations in plasma samples ...201121327334
identification of centrarchid hepcidins and evidence that 17beta-estradiol disrupts constitutive expression of hepcidin-1 and inducible expression of hepcidin-2 in largemouth bass (micropterus salmoides).hepcidin is a highly conserved antimicrobial peptide and iron-regulatory hormone. here, we identify two hepcidin genes (hep-1 and hep-2) in largemouth bass (micropterus salmoides) and smallmouth bass (micropterus dolomieu). hepcidin-1 contains a putative atcun metal-binding site in the amino-terminus that is missing in hepcidin-2, suggesting that hepcidin-1 may function as an iron-regulatory hormone. both hepcidins are predominately expressed in the liver of largemouth bass, similar to other fis ...200919376234
intersex (testicular oocytes) in smallmouth bass from the potomac river and selected nearby drainages.intersex, or the presence of characteristics of both sexes, in fishes that are normally gonochoristic has been used as an indicator of exposure to estrogenic compounds. in 2003, during health assessments conducted in response to kills and a high prevalence of skin lesions observed in smallmouth bass micropterus dolomieu in the south branch of the potomac river, the presence of immature oocytes within testes was noted. to evaluate this condition, a severity index (0-4) was developed based on the ...200718333481
trophic transfer and biotransformation of polychlorinated biphenyls in zebra mussel, round goby, and smallmouth bass in lake erie, usa.trophic transfer of polychlorinated biphenyl (pcb) congeners in zebra mussels (dreissena polymorpha), round gobies (neogobius melanstomus), and smallmouth bass (micropterus dolomieu) were assessed in four sites along the south shore of the west and central basin of lake erie (all sites were in oh, usa). total pcb levels in smallmouth bass (1,091-1,520 ng/g wet weight) and round gobies (118-256 ng/g wet weight) were similar among sites despite a west-to-east decrease in total pcb concentrations i ...200616629146
climate response among growth increments of fish and trees.significant correlations were found among the annual growth increments of stream fish, trees, and climate variables in the ozark region of the united states. the variation in annual growth increments of rock bass (ambloplites rupestris) from the jacks fork river was significantly correlated over 22 years with the ring width of four tree species: white oak (quercus alba), post oak (quercus stellata), shortleaf pine (pinus echinata) and eastern red cedar (juniperus virginiana). rock bass growth an ...199528307582
the abiotic and biotic factors limiting establishment of predatory fishes at their expanding northern range boundaries in ontario, canada.there is a poor understanding of the importance of biotic interactions in determining species distributions with climate change. theory from invasion biology suggests that the success of species introductions outside of their historical ranges may be either positively (biotic acceptance) or negatively (biotic resistance) related to native biodiversity. using data on fish community composition from two survey periods separated by approximately 28 years during which climate was warming, we examine ...201525556555
environmental contaminants and biomarker responses in fish from the columbia river and its tributaries: spatial and temporal were collected from 16 sites on rivers in the columbia river basin (crb) from september 1997 to april 1998 to document temporal and spatial trends in the concentrations of accumulative contaminants and to assess contaminant effects on the fish. sites were located on the mainstem of the columbia river and on the snake, willamette, yakima, salmon, and flathead rivers. common carp (cyprinus carpio), black bass (micropterus sp.), and largescale sucker (catostomus macrocheilus) were the targeted ...200616406490
the acute toxicity of msma to black bass (micropterus dolomieu), crayfish (procambarua sp.) and channel catfish (ictalurus lacustris). 19751174748
description of two new gill myxozoans from smallmouth (micropterus dolomieu) and largemouth (micropterus salmoides) bass.two previously undescribed species of myxozoan parasites were observed in the gills of bass inhabiting the potomac and james river basins. they are described using morphological characteristics and small-subunit (ssu) rdna gene sequences. both were taxonomically identified as new species of myxobolus; myxobolus branchiarum n. sp. was found exclusively in smallmouth bass, and myxobolus micropterii n. sp. was found in largemouth and smallmouth bass. small, spherical, white plasmodia of m. branchia ...201222060822
ecological risk of methylmercury to piscivorous fish of the great lakes region.contamination of fish populations with methylmercury is common in the region of the laurentian great lakes as a result of atmospheric deposition and methylation of inorganic mercury. using fish mercury monitoring data from natural resource agencies and information on tissue concentrations injurious to fish, we conducted a screening-level risk assessment of mercury to sexually mature female walleye (sander vitreus), northern pike (esox lucius), smallmouth bass (micropterus dolomieu), and largemou ...201121691859
prey capture behavior of native vs. nonnative fishes: a case study from the colorado river drainage basin (usa).the colorado river drainage basin is home to a diverse but imperiled fish fauna; one putative challenge facing natives is competition with nonnatives. we examined fishes from colorado river tributaries to address the following questions: do natives and nonnatives from the same trophic guild consume the same prey items? will a given species alter its behavior when presented with different prey types? do different species procure the same prey types via similar feeding behaviors? roundtail chub (g ...201222514041
reproductive health indicators of fishes from pennsylvania watersheds: association with chemicals of emerging concern.fishes were collected at 16 sites within the three major river drainages (delaware, susquehanna, and ohio) of pennsylvania. three species were evaluated for biomarkers of estrogenic/antiandrogenic exposure, including plasma vitellogenin and testicular oocytes in male fishes. smallmouth bass micropterus dolomieu, white sucker catostomus commersonii, and redhorse sucker moxostoma species were collected in the summer, a period of low flow and low reproductive activity. smallmouth bass were the only ...201424934131
evidence of estrogenic endocrine disruption in smallmouth and largemouth bass inhabiting northeast u.s. national wildlife refuge waters: a reconnaissance study.intersex as the manifestation of testicular oocytes (to) in male gonochoristic fishes has been used as an indicator of estrogenic exposure. here we evaluated largemouth bass (micropterus salmoides) or smallmouth bass (micropterus dolomieu) form 19 national wildlife refuges (nwrs) in the northeast u.s. inhabiting waters on or near nwr lands for evidence of estrogenic endocrine disruption. waterbodies sampled included rivers, lakes, impoundments, ponds, and reservoirs. here we focus on evidence of ...201626454754
response latencies to postural disturbances in three species of teleostean fishes.flow in aquatic systems is characterized by unsteadiness that creates destabilizing perturbations. appropriate correction responses depend on response latency. the time between a disturbance induced by either removal of a flow refuge or striking various parts of the body with a narrow water jet was measured for three species, chosen as examples of modes in teleostean body/fin organization that are expected to affect stability. creek chub semotilus atromaculatus is representative of fusiform-bodi ...200414766954
methylmercury in fish from owyhee reservoir in southeast oregon: scientific uncertainty and fish collected during 1987-1994 showed elevated levels of mercury (hg) in fish tissue from the owyhee reservoir in southeastern oregon. sixty-five percent of the samples analyzed had total hg levels exceeding the us environmental protection agency's (epa) health screening value of 0.6 mg/kg. eighteen out of 89 (20%) fish tissue samples also had total hg levels greater than the us food and drug administration's (fda) mercury action level of 1.0 mg/kg. the overall mean hg content for all fish coll ...19979335158
histopathology of brown bullhead (ameiurus nebulosus), smallmouth bass (micropterus dolomieu), and yellow perch (perca flavescens) in relation to polychlorinated biphenyl (pcb) contamination in the hudson river.from the 1940s through 1977, at least 590,000kg of polychlorinated biphenyls (pcbs) were released into the hudson river from general electric manufacturing plants located in hudson falls and fort edward, new york. in 1984, the u.s. environmental protection agency designated a nearly 322km reach as the hudson river pcbs superfund site. here we describe a fish health assessment study, part of a natural resource damage assessment, that evaluated the prevalence of toxicopathic lesions in adult brown ...201727751691
immunocytochemical applications of specific antisera raised against synthetic fragment peptides of mummichog gth subunits: examining seasonal variations of gonadotrophs (fsh cells and lh cells) in the mummichog and applications to other acanthopterygian fishes.two distinct types of gonadotrophs, fsh (gth i) cells and lh (gth ii) cells, were immunocytochemically identified from mummichog (fundulus heteroclitus; cyprinodontiformes, acanthopterygii) pituitary using antisera raised against synthetic fragment peptides of fshbeta and lhbeta. both cell types were abundant during the spawning period (spring and early summer) and decreased in number during the post-spawning immature period. the number of fsh cells increased again during the early phases of gon ...200312765642
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