cryptobia cataractae from the blood of semotilus atromaculatus: structure and division in the fish.a cryptobiid was found in the blood of 2 of 9 semotilus atromaculatus from a tributary of the saugeen river in ontario, canada. blood inoculation produced an infection in 2 uninfected s. atromaculatus but not in any oncorhynchus mykiss, catostomus commersoni, or carassius auratus. the flagellate was identified as cryptobia cataractae, based on host restriction. cryptobia cataractae occurred as slender and broad forms (body width 3.0-8.7 microns). the length of the anterior flagellum was equal to ...19902213407
encapsulation of myxobolus pendula (myxosporidia) by epithelioid cells of its cyprinid host semotilus atromaculatus.spores of myxobolus pendula develop within the cores of complex cysts on the gill arch of creek chub semotilus atromaculatus. adjacent to, and surrounding, the spores are concentric layers of stratified interdigitating cells, whose nature was examined by transmission electron microscopy and by immunohistochemical and molecular biological techniques. in situ hybridization data using parasite-derived ribosomal dna as a probe indicate that infection leads to the encapsulation of developing plasmodi ...200415715236
taxonomy of myxobolus ridouti n. sp. and m. ridgwayi n. sp. (myxozoa) from pimephales notatus and semotilus atromaculatus (cypriniformes) in ontario.myxobolus ridouti n. sp. and m. ridgwayi n. sp. are described, respectively, from pimephales notatus (rafinesque) and semotilus atromaculatus (mitchill) in algonquin park, ontario, canada. both are intracellular in striated muscles of the body flank. spores of m. ridouti n. sp. are subcircular (9.5-10.5 μm long by 9.4-10.9 μm wide); those of m. ridgwayi n. sp. are oval (10.0-12.1 μm long by 9.5-10.5 μm). both species have spores with a small, distinct swelling (1 μm) on the spore valve near the ...200919663535
evidence of debromination of decabromodiphenyl ether (bde-209) in biota from a wastewater receiving stream.decabromodiphenyl ether (bde-209) is a high production volume flame retardant. to date, regulation and control of its environmental release have been minimal. once in the environment, bde-209 may encounter conditions favoring debromination, potentially forming congeners with greater toxicity, bioaccumulation potential, and persistence. however, (photolytic and in vivo) debromination has only been demonstrated under laboratory scenarios. to examine whether debromination was likely in the field, p ...200717969678
community structure and seasonal dynamics of dactylogyrus spp. (monogenea) on the fathead minnow (pimephales promelas ) from the salt valley watershed, lancaster county, nebraska.the gill monogene communities of pimephales promelas (fathead minnow) in 3 distinct sites on converging streams were investigated from 2004 to 2006 in 3 different seasons. thirty collections of p. promelas were made in southeastern nebraska along 3 converging tributaries: elk creek (40.88534°n, 96.83366°w), west oak creek (40.9082°n, 96.81432°w), and oak creek (40.91402°n, 96.770583°w), lancaster county, nebraska. in all, 103 p. promelas were collected from elk creek, 115 from west oak creek, an ...200919642810
spatial heterogeneity in the parasite communities of creek chub (semotilus atromaculatus) in southeastern nebraska.the intestinal helminth communities of creek chub (semotilus atromaculatus) were studied in the streams of southeastern nebraska to characterize spatial variation, to determine whether drainages act as regional species pools, and to examine the spatial patterning of individual parasite species within and among drainages. creek chub were sampled in the summer of 2003 and the spring of 2004 at each of 12 sites distributed evenly among 3 drainages in the big nemaha river watershed. four intestinal ...200616729677
changes in host and parasite-derived cellular and extracellular matrix components in developing cysts of myxobolus pendula (myxozoa).cysts of myxobolus pendula from the gill arch of creek chub (semotilus atromaculatus) were examined at various stages of development using light and electron microscopy. the subepithelial host connective tissue underwent dramatic changes, including degradation and remodelling of collagen and vascularisation, in response to the infection. inflammatory cells lay in a fluid-filled space beneath the host's connective tissue and surrounded a distinctive parasite-derived matrix, composed of collagen f ...200212043964
trypanosoma danilewskyi: host specificity and host's effect on morphometrics.carassius auratus, barbus conhus, danio malabaricus, catostomus commersoni, notropis cornutus, etheostoma caeruleum, and ictalurus nebulosus were susceptible to trypanosoma danilewskyi by intraperitoneal inoculation. trypanosomes isolated from all species of susceptible fishes were infective to goldfish. no trypanosomes were detected in inoculated semotilus atromaculatus, ambloplites rupestris, lepomis gibbosus and perca flavescens. fifty specimens were measured from each of 3 c. auratus, 2 b. c ...19846512642
short-term exposures of fish to perfluorooctane sulfonate: acute effects on fatty acyl-coa oxidase activity, oxidative stress, and circulating sex steroids.this study investigated the effects of exposure to waterborne perfluorooctane sulfonate (pfos) on oxidative stress and reproductive endpoints in fish. exposures utilized species commonly used in toxicological testing, including the fathead minnow (pimephales promelas) and rainbow trout (oncorhynchus mykiss), as well as relatively insensitive taxa such as creek chub (semotilus atromaculatus), spottail shiner (notropis hudsonius), and white sucker (catostomus commersoni). in all fish species, shor ...200516110997
downstream changes in the composition of the parasite community of fishes in an appalachian stream.the spatial distribution of 6 parasite species (myxobolus sp., dactylogyrus sp., sterliadochona ephemeridarum, plagioporus sinitsini, allopodocotyle chiliticorum, allocreadium lucyae) was studied in 5 species of fishes (oncorhynchus mykiss, clinostomus funduloides, notropis chiliticus, rhinichthys atratulus, semotilus atromaculatus) in basin creek, an appalachian stream in north carolina. nonmetric multidimensional scaling and vector fitting were used to determine if the proximity of sampling si ...200111318552
in vivo and in vitro studies on the host specificity of trypanoplasma salmositica.the host specificity of trypanoplasma salmositica was studied by experimental inoculation into 13 species of common teleosts (notropis cornutus, notropis heterolepis, notropis spiloperus, nocomis biguttatus, rhinichthys atratulus, semotilus atromaculatus, carassius auratus, ambloplites rupestris, lepomis gibbosus, etheostoma nigrum, hypentelium nigricans, ictalurus melas, and eucalia inconstans). t. salmositica was not recovered at 14 and 40 days post inoculation. however, large numbers of the p ...19807431516
infection by a black spot-causing species of uvulifer and associated opercular alterations in fishes from a high-desert stream in spot is a common disease syndrome of freshwater fishes. this study provides information on the rank of density of the black spot agent and opercular bone alterations associated with at least one digenean, uvulifer sp., infecting native and non-native catostomids and cyprinids of the upper colorado river basin. we evaluated the density rank of pigmented metacercariae and associated alterations in the operculum of the bluehead sucker catostomus discobolus, flannelmouth sucker c. latipinnis, ...200718286809
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
population biology of allocreadium lobatum wallin, 1909 (digenea: allocreadiidae) in the creek chub, semotilus atromaculatus, mitchill (osteichthyes: cyprinadae), in a nebraska creek, usa.allocreadium lobatum wallin, 1909 has been reported in cyprinid species of freshwater fish in canada and in the united states. the population biology of a. lobatum in the host semotilus atromaculatus mitchill was studied from may through december 1991, in a usa creek. overall prevalence (64%) and mean intensity (4.4 +/- 0.4) were greater than previously reported while abundance, reported for the first time, was 2.8 +/- 0.3. several trends in a. lobatum population biology as a function of s. atro ...200111313639
overwinter alterations in energy stores and growth in juvenile fishes inhabiting areas receiving metal mining and municipal wastewater effluents.the winter stress syndrome hypothesis proposes that the combination of winter conditions and contaminant exposure reduces overwinter survival in juvenile fishes, mainly due to increased depletion of stored energy (lipids). to test this hypothesis in the field, juvenile fathead minnows (pimephales promelas), creek chub (semotilus atromaculatus), and white sucker (catostomus commersoni) were collected from three exposure sites along junction creek, sudbury, ontario, canada, representing cumulative ...200918939888
myxosoma pendula n. sp. (protozoa, myxosporida) from the creek chub semotilus atromaculatus. 19674962563
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