further observations upon the hemoglobin systems of thermally-acclimated freshwater teleosts: pumpkinseed (lepomis gibbosus), white sucker (catostomus commersoni), carp (cyprinus carpio), goldfish (carassius auratus) and carp-goldfish hybrids. 19764279
myxosporidan parasites for pumpkinseed (lepomis gibbosus l.) from ontario.five species of myxosporideans were found in pumpkinseed (lepomis gibbosus l.) from ryan lake, algonquin park, ontario. myxobolus osburni herrick 1936 was found in pancreatic tissue. myxobilatus ohioensis (herrick 1941) davis 1944 was found in the ureters and urinary bladder. three new species are described, namely, myxobolus uvuliferis sp. n. (in the fibrous capsule surrounding the metacercariae of uvulifer ambloplitis (hughes 1927), myxobolus magnaspherus sp. n. (in the parietal peritoneum) an ...1977407348
centrarchid fish as paratenic hosts of the giant kidney worm, dioctophyma renale (goeze, 1782), in ontario, canada.infective larvae of dioctophyma renale were found in the hypaxial musculature of pumpkinseed (lepomis gibbosus l.) from three lakes in algonquin provincial park, ontario, canada. this represents the first report of d. renale in centrarchid fish. in the three lakes surveyed prevalence and mean intensity ranged from 5 to 23% and one to two larvae respectively. larvae elicited a mild granulomatous reaction in pumpkinseed. two ferrets were each given five larvae from pumpkinseed. adult d. renale wer ...19853157009
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
pancreatic infections of myxobolus osburni herrick (myxozoa: myxosporea) in the pumpkinseed, lepomis gibbosus (linnaeus) in iowa.cysts of myxobolus osburni occurred throughout the pancreas in 119 of 150 (79.3%) pumpkinseed (lepomis gibbosus) from west lake okoboji, northwest iowa during the summer, 1980. none of 341 bluegill (lepomis macrochirus) were infected. lobate cysts (up to 3 mm diameters) adjacent to the gall bladder contained sporulating plasmodia and mature spore masses. inflammatory responses in the infected pancreas included engorged blood vessels, endocrine cell nuclei pyknosis, leukocyte (mostly lymphocyte) ...19826808159
population biology and host-parasite relationships of triganodistomum attenuatum (trematoda: lissorchiidae) infecting the white sucker, catostomus commersoni (lacépède).triganodistomum attenuatum demonstrated similar seasonal infection patterns in white suckers, catostomus commersoni, from the bellamy and oyster rivers, new hampshire. mean intensity was highest in spring 1975 and 1976. nongravid and gravid worms were common in the spring, and in the spring and summer, respectively. most individuals of t. attenuatum parasitized the posterior portion of the sucker's intestine. no definite changes in prevalence and mean intensity were evident at either river as fi ...19807391871
primary structure of solitary form of gonadotropin-releasing hormone (gnrh) in cichlid pituitary; three forms of gnrh in brain of cichlid and pumpkinseed fish.gnrh is a decapeptide family with at least nine distinct structures. vertebrates, except for most placental mammals, have more than one of these gnrh forms within the brain. we report chromatographical and immunological evidence that three forms of gnrh are in the brains of both cichlid (haplochromis burtoni) and pumpkinseed (lepomis gibbosus) fishes. we argue that the three forms correspond to those previously described as sea bream gnrh (sbgnrh), chicken gnrh-ii and salmon gnrh. in contrast, o ...19957644702
survey of the paratenic hosts of anguillicola crassus in lake velence, hungary.anguillicola crassus infection of paratenic hosts was investigated in lake velence, hungary, in october 1992. a total of 155 specimens of 8 species (gymnocephalus cernuus, lepomis gibbosus, stizostedion lucioperca, abramis brama, alburnus alburnus, cyprinus carpio, pseudorasbora parva and rutilus rutilus) were examined: all species proved to be infected. there were large differences in the prevalence of infection among fishes, but the prevalence was generally higher in perciform fishes and it wa ...19947810405
mercury content of small pan fish from new york state waters.yellow perch (perca flavescens) and pumpkin seed (lepomis gibbosus) were sampled from 16 waters in new york-state and analyzed for total mercury concentration. the levels of mercury in the fish were all well below the safe guideline for human consumption (1 ppm of mercury, fresh weight) of the u.s. food and drug administration. factors affecting the mobility, methylation and absorption of mercury by fish are discussed.19947953472
species of myxobolus (myxozoa) from the bulbus arteriosus of centrarchid fishes in north america, with a description of two new species.three species of myxobolus (myxozoa, myxosporea) occur in heart tissue of centrarchids. myxobolus paralintoni li and desser, 1985 from lepomis gibbosus in algonquin park and in lake erie, ontario, has subcircular spores (in plane of spore length) in frontal view (11-13 microm long, 9-10 microm wide, and 5 microm thick) with a width-to-length ratio of 1:1.2. myxobolus jollimorei n. sp. from lepomis macrochirus in lake erie and in the pascagoula river system, mississippi, has subcircular spores (i ...19989576514
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
factors affecting food chain transfer of mercury in the vicinity of the nyanza site, sudbury river, massachusetts.the influence of the nyanza chemical waste dump superfund site on the sudbury river, massachusetts, was assessed by analysis of sediment, fish prey organisms, and predator fish from four locations in the river system. whitehall reservoir is an impoundment upstream of the site, and reservoir #2 is an impoundment downstream of the site. cedar street is a flowing reach upstream of the site, and sherman bridge is a flowing reach downstream of the site. collections of material for analysis were made ...200312858964
endocrine disruption and altered gonadal development in white perch (morone americana) from the lower great lakes region.high prevalences of gonadal intersex have been observed in wild fish populations in areas affected by domestic and industrial effluents. for this study, fish were collected in 1998 from the cootes paradise region of hamilton harbour in western lake ontario, canada, to determine whether gonadal abnormalities, including intersex, were present in young of the year (yoy) fish. no gonadal abnormalities were observed in goldfish (carassius auratus), common carp (cyprinus carpio), gizzard shad (dorosom ...200415175179
new records of alien monogeneans from lepomis gibbosus and silurus glanis in italy.the first geographical records of five alien monogeneans for italy is reported. four species have been detected from lepomis gibbosus (linnaeus, 1758): actinocleidus recurvatus mizelle et donahue, 1944, actinocleidus oculatus (mueller, 1934), urocleidus similis (mueller, 1936) and urocleidus dispar (mueller, 1936); one species from silurus glanis linnaeus, 1758: thaparocleidus vistulensis (siwak, 1932) n. comb.200315267103
resolving within- and between-population variation in feeding ecology with a biomechanical model.studies of phenotypic plasticity have emphasized the effect of the environment on the phenotype, but plasticity can also be used as a tool to study the functional significance of key traits. by inducing variation in phenotypes and testing quantitative models that predict performance based on biological mechanisms, we can develop functionally general models of performance. pumpkinseed sunfish from lakes with high snail availability have large levator posterior muscles (which are used to crush sna ...200415338265
investigation of histopathological and cytogenetic effects on lepomis gibbosus (pisces: perciformes) in the cine stream (aydin/turkey) with determination of water pollution.water quality and the distribution of some heavy metals in three different organs of lepomis gibbosus from the cine stream were studied. also, histopathological changes in gill, liver, and muscle tissue were examined at light microscopical level. micronucleus (mn) formation in fish erytrocytes, as an indicator of chromosomal damage, has been increasingly used to detect the genotoxic potential of environmental contaminants. the frequency of mn was examined from samples of fish from the cine strea ...200516302173
foodweb transfer, accumulation, and depuration of microcystins, a cyanobacterial toxin, in pumpkinseed sunfish (lepomis gibbosus).zooplankton accumulate microcystins (mc), a potent cyanobacteria toxin, and therefore may act as vectors of the toxin up the aquatic food web; however this transfer has not yet been quantified. in addition there is a lack of information regarding fish's ability to metabolize mc when administered a low dose over a longer period of time. we monitored mc concentrations in three levels of an aquatic food web: phytoplankton, zooplankton, and sunfish (lepomis gibbosus). bosmina appeared to be both a m ...200616928388
pcb levels and accumulation patterns in waterbird eggs and in their prey at lake kerkini, a north-eastern mediterranean wetland of international "target" pcb levels were determined and compared in waterbird eggs, in their prey, and in water at lake kerkini, northern greece, to investigate pcb bioaccumulation patterns and to define the best bioindicator of target pcbs for this area. pcbs were analysed from eggs of phalacrocorax carbo, podiceps cristatus, ardea cinerea, egretta garzetta, and nycticorax nycticorax and from prey types alburnus alburnus, rutilus rutilus, lepomis gibbosus. carassius auratus, and rana sp. pcbs analysed we ...200717549546
restoration of visual function following optic nerve regeneration in bluegill (lepomis macrochirus) x pumpkinseed (lepomis gibbosus) hybrid sunfish.simple (dorsal light reflex) and complex (predator-prey interactions) visually mediated behaviors were used concurrently with morphological examination to assess restoration of visual function following optic nerve crush in bluegill (lepomis macrochirus) x pumpkinseed (lepomis gibbosus) hybrid sunfish. regenerating optic nerve axons projected into the stratum opticum-stratum fibrosum et griseum superficiale by week 2, the stratum griseum centrale by week 4, and stratum album centrale by week 6. ...200717550642
allometric scaling in centrarchid fish: origins of intra- and inter-specific variation in oxidative and glycolytic enzyme levels in muscle.the influence of body size on metabolic rate, muscle enzyme activities and the underlying patterns of mrna for these enzymes were explored in an effort to explain the genetic basis of allometric variation in metabolic enzymes. we studied two pairs of sister species of centrarchid fish: black bass (largemouth bass micropterus salmoides and smallmouth bass micropterus dolomieui) and sunfish (pumpkinseed lepomis gibbosus and bluegill lepomis macrochirus). our goal was to assess the regulatory basis ...200717951421
a molecular genetic examination of the mating system of pumpkinseed sunfish reveals high pay-offs for specialized sneakers.intrasexual variation in reproductive behaviour and morphology are common in nature. often, such variation appears to result from conditional strategies in which some individuals (e.g. younger males or those in poor condition) adopt a low pay-off phenotype as a 'best of a bad job'. alternatively, reproductive polymorphisms can be maintained by balancing selection, with male phenotypes having equal fitnesses at equilibrium, but examples from nature are rare. many species of sunfish (genus lepomis ...200818429852
parasitic nematodes of pumpkinseed sunfish (lepomis gibbosus l., 1758) from warm-water canal of a power plant in szczecin, poland.parasitological examination of 273 pumpkinseed sunfish, caught in the warm water channel at the dolna odra power plant in stare czarnowo near szczecin was carried out. the total lengths of the fish ranged from 6.8 to 18.1 cm (13.3 cm means), infected fish 9.8 to 17.5 cm. in 48 individuals the presence of nematodes representing 4 species has been found: schulmanela petruschewskii, raphidascaris acus, spiroxys contortus and contracaecum sp. in total the number of nematodes found was 319, the mean ...200819055062
paternity, parental behavior and circulating steroid hormone concentrations in nest-tending male many teleost fishes, bluegill (lepomis macrochirus) are characterized by sole male parental care of offspring. in addition, bluegill parental males experience cuckoldry by specialized parasitic male morphs. this cuckoldry has previously been shown to influence the expression of parental care behavior. to better understand some of the proximate mechanisms mediating parental behavior, we examined the relationships between circulating steroid hormones, paternity, and parental behavior during t ...200919446557
post-mating reproductive barriers in two unidirectionally hybridizing sunfish (centrarchidae: lepomis).the evolutionary sequence of events in the evolution of reproductive barriers between species is at the core of speciation biology. where premating barriers fail, post-mating barriers, such as conspecific sperm precedence (csp), gamete incompatibility (gi) and hybrid inviability (hi) may evolve to prevent the production of (often) costly hybrid offspring with reduced fitness. we tested the role of post-mating mechanisms for the reproductive isolation between two sunfish species [bluegill (bg) le ...201021029236
monogenean parasites of introduced pumpkinseed lepomis gibbosus (centrarchidae) in the danube river basin.the pumpkinseed, lepomis gibbosus, a centrarchid fish native to eastern north america, was introduced into europe at the end of the 19th century. lepomis gibbosus now represents one of the most successful of introduced fish species, having spread widely throughout many european countries. in this study, we collected monogenean parasites of l. gibbosus from four sites in the danube river basin. we recorded four monogenean species: gyrodactylus sp., probably acquired in the area of introduction, a ...201021208472
intra- and inter-specific variation in metabolic gene expression in relationship to environmental this study, we explored how environmental oxygen levels affect the metabolic phenotype of sympatric sunfish known to differ in their hypoxia tolerance. we examined bluegill (lepomis macrochirus) and pumpkinseed (lepomis gibbosus), two species commonly found in the same water bodies, though pumpkinseed are considered more hypoxia tolerant, and survive in hypoxic lakes that exclude bluegill. freshly caught lake opinicon pumpkinseed possessed significantly higher glycolytic enzyme activities (pg ...201121266200
fish abundances in shoreline habitats and submerged aquatic vegetation in a tidal freshwater embayment of the potomac river.submerged aquatic vegetation (sav) is considered an important habitat for juvenile and small forage fish species, but many long-term recruitment surveys do not effectively monitor fish communities in sav. to better understand the impact of recent large increases of sav on the fish community in tidal freshwater reaches of the potomac river, we compared traditional seine sampling from shore with drop ring sampling of sav beds (primarily hydrilla) in a shallow water (depths, <1.5-ám) embayment, gun ...201121713468
an invasion record for the swimbladder nematode anguillicoloides crassus in european eel anguilla anguilla in a deep cold-monomictic lake, from invasion to steady state.this study is the first account of the establishment and development of the neozoic nematode parasite anguillicoloides crassus in its host, the european eel anguilla anguilla, in a deep, cold-monomictic lake. a 21 year study of a. crassus took place in upper lake constance (ulc), europe's second largest pre-alpine lake. the study included two extensive surveys, one in 1991 during the initial parasite invasion phase and the second in 2006 when the infection was well established. the subtropical s ...201121884109
susceptibility of common carp and sunfish to a strain of francisella noatunensis subsp. orientalis in a challenge experiment.francisellosis, an emerging disease in many fish species, can cause high mortality in affected populations. here we investigated the susceptibility of common carp cyprinus carpio and sunfish lepomis gibbosus to francisella noatunensis subsp. orientalis (fno), and possible transmission of the bacteria between the 2 fish species. in a challenge experiment, 3 groups of each species were injected intraperitoneally (ip) with 3 different doses of an fno strain no. 9449 of the norwegian veterinary inst ...201627667813
impact of the cestode triaenophorus nodulosus on the exotic lepomis gibbosus and the autochthonous perca fluviatilis.the effects of plerocercoids of the cestode triaenophorus nodulosus infecting the livers of native eurasian perch perca fluviatilis and non-native pumpkinseed lepomis gibbosus was investigated in 17 sites along the moselle watershed. with a single exception, infected individuals were not observed in the main channel whether or not northern pike esox lucius, a final host, was present. in ponds where the pike was present, the prevalence of t. nodulosus averaged 86% in eurasian perch and 15% in pum ...201525475253
enantioselective analysis of non-steroidal anti-inflammatory drugs in freshwater fish based on microextraction with a supramolecular liquid and chiral liquid chromatography-tandem mass spectrometry.toxicity of pharmaceuticals to aquatic biota is still largely unknown, and no research on the stereoselective toxicity of chiral drugs to these organisms has been undertaken to date. because of the lack of analytical methods available for this purpose, this manuscript deals, for the first time, with the enantioselective analysis of the non-steroidal anti-inflammatory drugs (nsaids) ibuprofen, naproxen and ketoprofen in freshwater fish. the method was based on the microextraction of nsaids from f ...201525869485
historical process lead to false genetic signal of current connectivity among populations.identification of the effects of historical processes on spatial genetic variation is of major importance in landscape genetics, especially in recent systems where the signal of recent isolation is often hardly perceptible. the goal of this study was to assess how differences in colonization patterns could influence spatial genetic variation using two centrarchidae species, the pumpkinseed sunfish (lepomis gibbosus) and the rock bass (ambloplites rupestris), from two adjacent drainage systems. t ...201122388987
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
stress in the neighborhood: tissue glucocorticoids relative to stream quality for five species of fish.anthropogenic alterations to terrestrial habitat (e.g., urbanization, deforestation, agriculture) can have a variety of negative effects on watercourses that flow through disturbed landscapes. currently, the relationship between stream habitat quality and fish condition remains poorly understood. the use of physiological metrics such as glucocorticoids (gcs) provides a useful tool for quantifying these effects by relating the health of resident fishes to stream quality. to date, however, most st ...201626780133
comparative study of acetylcholine synthesis in organs of freshwater teleosts.the activity of acetylcholine (ach) synthesizing enzyme, choline acetyltransferase (chat), and the content of ach were determined in the brain, heart, red trunk muscle and midgut of 12 freshwater teleost species belonging to eight families: carp (cyprinus carpio), tench (tinca tinca), silver carp (hypophthalmichtys molitrix), bighead (hypophthalmichtys nobilis), wels (silurus glanis), cat fish (ictalurus nebulosus), eel (anguilla anguilla), rainbow trout (oncorhynchus mykiss), pike (esox lucius) ...199124214667
morphology and molecules reveal the alien posthodiplostomum centrarchi hoffman, 1958 as the third species of posthodiplostomum dubois, 1936 (digenea: diplostomidae) in europe.metacercariae of two species of posthodiplostomum dubois, 1936 (digenea: diplostomidae) were subjected to morphological and molecular studies: p. brevicaudatum (von nordmann, 1832) from gasterosteus aculeatus (l.) (gasterosteiformes: gasterosteidae), bulgaria (morphology, cox1 and its1-5.8s-its2) and perca fluviatilis l. (perciformes: percidae), czech republic (morphology, cox1, its1-5.8s-its2 and 28s); and p. centrarchi hoffman, 1958 from lepomis gibbosus (l.) (perciformes: centrarchidae), bulg ...201728062983
ionoregulatory aspects of the osmorespiratory compromise during acute environmental hypoxia in 12 tropical and temperate the traditional osmorespiratory compromise, as seen in the hypoxia-intolerant freshwater rainbow trout (oncorhynchus mykiss), the branchial modifications that occur to improve o2 uptake during hypoxia result in unfavorable increases in the fluxes of ions and water. however, at least one hypoxia-tolerant freshwater species, the amazonian oscar (astronotus ocellatus), shows exactly the opposite: decreased branchial flux rates of ions, water, and nitrogenous wastes during acute hypoxia. in order ...201526052633
dna barcoding common non-native freshwater fish species in turkey: low genetic diversity but high population structuring.negative impacts of introduced non-native freshwater species on native species have been increasingly recognized in the world as well as in turkey. however, there has been relatively little attention on genetic characterization of alien freshwater fishes in their non-native distribution range and virtually no study has been conducted in turkey despite its crucial importance in invasion biology. the purpose of this study was to elucidate genetic diversity of common non-native freshwater fish spec ...201323298166
hearing in fishes under noise conditions.our current knowledge on sound detection in fishes is mainly based on data acquired under quiet laboratory conditions. however, it is important to relate auditory thresholds to background noise in order to determine the signal-detecting abilities of animals in the natural environment. we investigated the influence of two noise levels within the naturally occurring range on the auditory sensitivity of two hearing specialists (otophysines) and a hearing generalist. audiograms of the goldfish caras ...200515735936
vip-like immunoreactivity in the intestinal tract of fish with different feeding habits.we studied the distribution of vasoactive intestinal polypeptide immunoreactive (vip-ir) cells and fibres in the intestine of three fish species with different feeding habits: the silver carp (hypophthalmichthys molitrix), the goldfish (carassius auratus), and the pumpkinseed sunfish (lepomis gibbosus). each species was divided into two groups: (1) fish fed once a day up until sacrifice and (2) fish fed once a day and then fasted three days before sacrifice. immunoreactive endocrine cells and fi ...19979174846
the hydrodynamic trails of lepomis gibbosus (centrarchidae), colomesus psittacus (tetraodontidae) and thysochromis ansorgii (cichlidae) investigated with scanning particle image velocimetry.the hydrodynamic trails of fish belonging to the families centrarchidae, tetraodontidae and cichlidae were investigated. water movements were measured in six horizontal planes, spaced 10-12 mm apart, for up to 5 min after the passage of a fish, using a computer controlled array of modulated laser diodes. we measured continuously and non-continuously swimming fish. water velocities decayed rapidly in the leading seconds after the passage of a fish, but could still be measured for a period conside ...200415037652
use of seasonally flooded marshes by fish in a mediterranean wetland: timing and demographic consequencesin the camargue (southern france), movements of fish between a canal and two seasonally flooded marshes were monitored continuously by fish traps for 3 years for one marsh and for 2 years for the other. the timing of the entry and exit of the main species was determined together with species annual demographic balance, defined as the difference between the number of fish leaving and the number of fish entering. only some of the species inhabiting the canal colonized the marshes. except those spe ...19979236092
altered trophic pathway and parasitism in a native predator (lepomis gibbosus) feeding on introduced prey (dreissena polymorpha).populations of invasive species tend to have fewer parasites in their introduced ranges than in their native ranges and are also thought to have fewer parasites than native prey. this 'release' from parasites has unstudied implications for native predators feeding on exotic prey. in particular, shifts from native to exotic prey should reduce levels of trophically transmitted parasites. we tested this hypothesis in native populations of pumpkinseed sunfish (lepomis gibbosus) in lake opinicon, whe ...201424562470
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
henneguya episclera sp. n. (protozoa: myxosporida), a new myxosporidan from the eye of the pumpkinseed sunfish.henneguya episclera sp. n. is described from the episclera of the eye of the pumpkinseed sunfish (lepomis gibbosus). mean spore dimensions (in micrometers) are: total length 62.6; spore length 21.7; spore thickness 8.0; spore breadth 8.7; tail lengths 37.1 and 40.9; polar capsule lengths 6.0 and 6.5; polar capsule breadths 2.7 and 3.0; polar capsule thickness 3.5; and vacuole 5 by 5.1977407349
laboratory and field validation of a simple method for detecting four species of non-native freshwater fish using edna.this paper presents the first phase in the development and validation of a simple and reliable environmental (e)dna method using conventional pcr to detect four species of non-native freshwater fish: pumpkinseed lepomis gibbosus, sunbleak leucaspius delineatus, fathead minnow pimephales promelas and topmouth gudgeon pseudorasbora parva. the efficacy of the approach was demonstrated in indoor tank (44 l) trials in which all four species were detected within 24 h. validation was through two field ...201627465299
invasibility of mediterranean-climate rivers by non-native fish: the importance of environmental drivers and human pressures.invasive species are regarded as a biological pressure to natural aquatic communities. understanding the factors promoting successful invasions is of great conceptual and practical importance. from a practical point of view, it should help to prevent future invasions and to mitigate the effects of recent invaders through early detection and prioritization of management measures. this study aims to identify the environmental determinants of fish invasions in mediterranean-climate rivers and evalu ...201425372284
parasite fauna of introduced pumpkinseed fish lepomis gibbosus: first british record of onchocleidus dispar (monogenea).a survey of pumpkinseed lepomis gibbosus from a stillwater fishery in southern england revealed infections by the ancyrocephalid monogenean onchocleidus dispar at 100% prevalence. host specificity of o. dispar to north american centrarchid fish suggests that it is a non-native parasite, introduced to britain with l. gibbosus. mean intensity of o. dispar was significantly higher in male (25.5 parasites) compared to female (15) and immature (7) hosts, but was not influenced by host standard length ...201122235596
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