| [parasites of salmo trutta l. from the tirino river. ii. host-parasite interactions of helminth species]. | the hundred and sixteen brown trout (salmo trutta l.) which were examined for helminth parasites were captured in the river tirino, (l'acquila - italy). six parasite species (phyllodistomum simile, crowcrocaecum testiobliquum, crepidostomum metoecus, cyathocephalus truncatus, truttaedacnitis truttae and dentitruncus truttae) were recovered. ecological studies on each helminth species recovered have been carried out analysing the following aspects; the preference of each parasite species for cert ... | 1978 | 553267 |
| [parasites of salmo trutta l. from the titino river. part iii. histological observations of parasites of the intestinal tract]. | during researches on helminth parasites of salmo trutta l. from the river tirino (l'aquila - italy) histological studies of the intestinal tract of brown trout infected by the following species: crowcrocaecum testiobliquum (wisnewski, 1932) skrjabin e koval, 1956; cyathocephalus truncatus (pallas, 1781);o truttaedacnitis truttae (fabricius, 1794) petter, 1974 and dentitruncus truttae sinzar, 1955 have been carried out. the attachment of the single species and the histological changes in the host ... | 1978 | 553268 |
| [parasites of salmo trutta l. from the tirino river. part iv. intermediate hosts of cyathocephalus truncatus (pallas, 1781) and dentitruncus truttae sinzar, 1955]. | during studies on helminth parasites of brown trout (salmo trutta l.) from the river tirino (l'aquila - italy), the intermediate hosts of cyathocephalus truncatus (pallas, 1781) and dentitruncus truttae sinzar, 1955 have been searched for. a total of 15,444 amphipoda belonging to the following 3 species: echinogammarus roco karman, 1973, echinogammarus tibaldii pinkster and stock, 1970, and gammarus italicus goedmakers and pinkster, 1977, have been dissected. e. roco, e. tibaldii and g. italicus ... | 1978 | 553269 |
| observations on cyathocephalus truncatus pallas, 1781 (cestoda:spathebothriidea) in its intermediate and definitive hosts in a trout stream, north wales. | | 1966 | 6006730 |
| a chromosome study in the progenetic cestode cyathocephalus truncatus (cestoda:spathebothriidea). | the chromosomes of somatic cells of progenetic cyathocephalus truncatus, parasite of amphipod crustaceans, gammarus lacustris, from north-west chukotka were investigated using standard giemsa staining. the karyotype, not described previously, consists of 9 pairs of chromosomes (2n = 18), the most widespread number among cestodes. a considerable number of polypoid cells (34.7%) was noted in preparations. the chromosomes are comparatively large, up to 12.26 microns. according to centromeric index ... | 1996 | 9024864 |
| helminths in an intensively stocked population of lake trout, salvelinus namaycush, from lake huron. | eighty stocked lake trout salvelinus namaycush (salmonidae), collected from 2 locations in lake huron in may 1995, were examined for parasites. the parasite fauna of this top predator in lake huron was characterized by only 6 helminth species. echinorhynchus salmonis infected all lake trout with a mean intensity of 163.9. the intensity of this acanthocephalan species significantly increased with host length and weight. eubothrium salvelini infected 78 lake trout with a maximum number of 81 scole ... | 2000 | 10864274 |
| copulation of acanthocephalus anguillae (acanthocephala). | a total of 114 specimens of brown trout, salmo trutta linnaeus, 1758, was sampled by electrofishing between october 1998 and july 1999 from the ceresone stream (north of padua, italy). over 63% of fish were infected with three species of helminth: a tapeworm, cyathocephalus truncatus (pallas, 1781), and two acanthocephalan species, echinorhynchus truttae (schrank, 1788) and acanthocephalus anguillae (muller 1780). on three occasions, in the fore-gut of three brown trout, three pairs of a. anguil ... | 2000 | 10894483 |
| associations and interactions among intestinal helminths of the brown trout, salmo trutta, in northern italy. | species co-occurrences and interspecific associations between intensity of infection were studied in helminth communities of three populations of brown trout, salmo trutta, from northern italy. of the eight helminth species, only four were common enough to be included in the analyses: pomphorhynchus laevis, acanthocephalus anguillae, echinorhynchus truttae and cyathocephalus truncatus. the observed frequencies of co-occurrences of the different species, based on presence/absence data, did not di ... | 2001 | 11818049 |
| influence of enteric helminths on the distribution of intestinal endocrine cells belonging to the diffuse endocrine system in brown trout, salmo trutta l. | the presence of intestinal helminths in the alimentary canal of brown trout, salmo trutta l., can alter the number of cells that synthesize modulatory peptides. a total of 167 brown trout were collected from tributaries of the river brenta (northern italy), of which 119 (71.3%) specimens were infected with enteric helminths, 28 with the acanthocephalan pomphorhynchus laevis müller, 1776 with intensity of infection ranging from 1 to 162 (18.57 +/- 30.79) worms per host and 67 fish with the cestod ... | 2003 | 12962225 |
| two new hosts for cyathocephalus truncatus (pallas, 1718) (cestoda; cyathocephalidae) in lake huron. | | 1965 | 14322439 |
| fine structure of the male reproductive ducts, vagina and seminal receptacle of cyathocephalus truncatus (cestoda: spathebothriidea). | fine structure of the vas efferens, vas deferens, ejaculatory duct with accessory glands and vagina with seminal receptacle is described in the spathebothriidean tapeworm, cyathocephalus truncatus (pallas, 1781) kessler, 1868. the numerous well-developed prostate glands are characterised by having secretory granules with an electron-dense core surrounded by a matrix of lower electron density. coalescence of the outer part of the granules with each other takes place in the terminal end of the sec ... | 2005 | 16270805 |
| fine structure of the female reproductive ducts of cyathocephalus truncatus (cestoda: spathebothriidea), from salmonid fish. | the fine structure of the ovary, ovicapt, oviduct, fertilisation canal, vitelline ducts, vitelline reservoir, ovovitelline duct, ootype and mehlis' gland, and proximal, middle and distal parts of the uterus of the spathebothriidean cestode, cyathocephalus truncatus (pallas, 1781), from salmoniform fish, has been studied for the first time by transmission electron microscopy (tem). emphasis was given to characteristics which might shed light on the unclarified phylogenetic position of spathebothr ... | 2005 | 16405296 |
| an immunocytochemical, histochemical and ultrastructural study of the nervous system of the tapeworm cyathocephalus truncatus (cestoda, spathebothriidea). | this study is the first detailed study of the organisation of the neuromuscular system of cyathocephalus truncatus (cestoda, spathebothriidea). five techniques have been used: (1) immunocytochemistry, (2) staining with tritc-conjugated phalloidin, (3) nadphdiaphorase histochemistry, (4) confocal scanning laser microscopy and (5) transmission electron microscopy. the patterns of nerves immunoreactive (ir) to antibodies towards serotonin (5-ht) and the invertebrate neuropeptide fmrfamide are descr ... | 2009 | 18802724 |
| parasites of the deepwater sculpin (myoxocephalus thompsonii) across its canadian range. | deepwater sculpin (myoxocephalus thompsonii) were collected from 19 lakes across the species' distribution in canada and examined for parasites. six helminth species (crepidostomum farionis, bothriocephalus cuspidatus, proteocephalus sp., cyathocephalus truncatus, raphidascaris acus, and echinorhynchus salmonis), 1 crustacean species (ergasilus nerkae), and 1 molluscan species (glochidia) parasitized these hosts. crepidostomum farionis, proteocephalus sp., r. acus, e. nerkae, and the glochidia r ... | 2009 | 19382824 |
| spatio-temporal dynamics of gastrointestinal helminths infecting four lake whitefish (coregonus clupeaformis) stocks in northern lakes michigan and huron, u.s.a. | abstract this study was undertaken to identify the community composition and structure of helminths infecting the gastrointestinal tract (git) of lake whitefish (coregonus clupeaformis) collected from four sites in northern lakes huron (cheboygan and de tour village) and michigan (big bay de noc and naubinway) from fall 2003 through summer 2006. a total of 21,203 helminths were retrieved from the gits of 1,284 lake whitefish. approximately 42% of the lake whitefish examined harbored at least one ... | 2011 | 21612422 |
| effects of the cestode parasite, cyathocephalus truncatus, on the fecundity and feeding rate of gammarus pulex (crustacea: amphipoda). | the amphipod gammarus pulex is an intermediate host to the cestode fish parasite cyathocephalus truncatus. in this study, we investigate effect of parasitism on female fecundity and feeding rate and compare ours results to those obtained previously with acanthocephalan parasite. similar reduction of the female fecundity was measured, whereas ours results on feeding rate were inconsistent, with a decrease of feeding rate induced by c. truncatus. the impacts of c. truncatus on g. pulex and similar ... | 2016 | 26545908 |
| [occurrence of helminths in amphipods gammarus lacustris sars, 1863 (amphipoda: gammaridae) from kronotskoe lake (kamchatka)]. | metacercariae of crepidostomum metoecus (prevalence 2.0%), procercoids of cyathocephalus truncatus (2.9%), and nematodes of the family cystidicolidae (17.6%) were found in the body cavity of amphipods gammarus lacustris from the kronotskoe lake. the nematodes were presented by cystidicola farionis (third-stage juvenile) and ascarophis sp. (adult and fourth-stage juvenile). | 2015 | 25702505 |
| behavioural and physiological effects of the trophically transmitted cestode parasite, cyathocephalus truncatus, on its intermediate host, gammarus pulex. | some parasites with complex life-cycles are able to manipulate the behaviour of their intermediate hosts in a way that increases their transmission to the next host. gammarids infected by the tapeworm cyathocephalus truncatus (cestoda: spathebothriidea) are known to be more predated by fish than uninfected ones, but potential behavioural manipulation by the parasite has never been investigated. in this study, we tested the hypothesis that c. truncatus is able to manipulate the behaviour of one o ... | 2007 | 17640401 |
| vitellogenesis in two spathebothriidean cestodes. | vitellogenesis in two spathebothriidean tapeworms, dixenous adult cyathocephalus truncatus and monoxenous progenetic diplocotyle olrikii, has been examined using transmission electron microscopy and cytochemical staining with periodic acid-thiosemicarbazide-silver proteinate for glycogen. each vitelline follicle consists of vitellocytes at various stages of development and one irregularly shaped interstitial cell. projections of the interstitial cell enclose the vitellocytes and extend as a cyto ... | 2005 | 15940521 |
| histochemistry of glycoconjugates in mucous cells of salmo trutta uninfected and naturally parasitized with intestinal helminths. | mucus secreted onto the surface of the intestine forms a physical barrier to invading parasites so that a possible attachment of helminths to the surface is prevented and their expulsion by peristalsis facilitated. in mammals, intestinal parasites induce hyperplasia and hypertrophy of intestine goblet cells and provoke changes in the mucus composition. in fish, this topic has received less attention. in the present investigation, histochemical methods were employed to compose intestinal mucous c ... | 2005 | 15900687 |
| aggregation of helminths: the role of feeding behavior of fish hosts. | individual arctic charr (salvelinus alpinus) from fjellfrøsvatn, northern norway, could be categorized by their stomach contents as zooplanktivores or benthivores. feeding specialization among these fish was evident from negative correlations between helminths transmitted by pelagic copepods (diphyllobothrium dendriticum and d. ditremum) and those transmitted by the benthic amphipod gammarus lacustris (cystidicola farionis and cyathocephalus truncatus). occurrences of parasite species acquired f ... | 2004 | 15040660 |
| effects of conspecifics and heterospecifics on individual worm mass in four helminth species parasitic in fish. | intraspecific and interspecific effects on the growth and body size of helminths are rarely studied in natural situations, yet knowing what determines helminth sizes and thus fecundity is crucial to our understanding of helminth ecology and epidemiology. the determinants of average individual worm mass were investigated in four common species of helminths parasitic in trout, salmo trutta. in the acanthocephalan echinorhynchus truttae, there was a negative relationship between the intensity of in ... | 2003 | 12756550 |
| identification of life cycle stages of cyathocephalus truncatus (cestoda: spathebothriidea) using molecular techniques. | morphological identification of tapeworm species at larval stages (procercoids and cysticercoids) is often difficult because few diagnostic characters are available. in the present study, a molecular approach (sequencing of partial 18s rdna gene) was used to evaluate the genetic similarity between adult specimens of cyathocephalus truncatus (pallas, 1871) (cestoda: spathebothriidea) found in fish, its definitive host, and procercoids of the same species recovered from amphipod, echinogammarus st ... | 2002 | 12099443 |
| selective predation on parasitized prey--a comparison between two helminth species with different life-history strategies. | in lake fjellfrøsvatn, northern norway, the larval helminths cyathocephalus truncatus and cystidicola farionis use gammarus lacustris as intermediate hosts and arctic charr (salvelinus alpinus) as final hosts. there was sampled 1,433 live g. lacustris from the lake and 1,964 g. lacustris from stomach contents of the charr. prevalence of infection were, respectively, 0.49% and 3.72% for c. truncatus, and 0.21% and 0.20% for c. farionis. usually, only 1 parasite was present in each host, and the 2 ... | 2001 | 11695412 |
| the ecology of endoparasitic helminth infections of brown trout (salmo trutta) and rainbow trout (oncorhynchus mykiss) in scotland. | two hundred and forty brown trout (salmo trutta) and 49 rainbow trout (oncorhynchus mykiss), obtained from 21 locations in central scotland between october 1990 and august 1993, were examined for endoparasitic helminth infections. crepidostomum farionis (digenea) was the most widely distributed helminth species, followed by eubothrium crassum (cestoda), diphyllobothrium dendriticum and d. ditremum (cestoda), neoechinorhynchus rutili (acanthocephala), echinorhynchus truttae (acanthocephala), eust ... | 1995 | 9599425 |
| parasites of the deepwater sculpin, myoxocephalus thompsoni (cottidae), from lake michigan and lake huron. | a total of 190 deepwater sculpins, myoxocephalus thompsoni, collected in 1995 from michigan waters of lake michigan and lake huron was examined for parasites. five parasite species occurred in sculpins from lake michigan with echinorhynchus salmonis being most common. six parasite species infected sculpins from lake huron, with haplonema sp. the most common. haplonema sp. is the only gravid helminth species reported from deepwater sculpins. pleistophora sp. and trichodina sp. infected sculpins f ... | 1997 | 9057717 |
| cyathocephalus truncatus (cestoda: spathebothridea) in its intermediate host echinogammarus stammeri (amphipoda) from the river brenta, northern italy. | a study was carried out on the occurrence of the tapeworm cyathocephalus truncatus (pallas, 1781) (cestoda: spathebothridea) in its intermediate host, the amphipod echinogammarus stammeri, in the river brenta. a total of 18,860 e. stammeri was examined from july 1990 to june 1994; only 25 of them (prevalence 0.13%) were infected with tapeworm larvae (intensity of infection 1 larva/host). co-occurrence of c. truncatus larvae with the larva of the acanthocephalan pomphorhynchus laevis (müller, 177 ... | 1995 | 8532369 |
| [histopathology of cyathocephalus truncatus infections in the rainbow trout]. | | 1987 | 3552565 |
| on some cestodes parasitizing freshwater fish in italy. | the paper presents a systematic survey of some cestodes parasitizing freshwater fish in italy. the following eight species were recorded: monobothrium wageneri, cyathocephalus truncatus, triaenophorus nodulosus (plerocercoids and adults), bothriocephalus acheilognathi, b. claviceps, ligula intestinalis (plerocercoids), schistocephalus sp. (plerocercoids) and proteocephalus percae from perca fluviatilis which is reported from freshwater fish in italy for the first time. all the tapeworms recovere ... | 1992 | 1339972 |
| pairing success and sperm reserve of male gammarus pulex infected by cyathocephalus truncatus (cestoda: spathebothriidea). | summarymanipulative parasites with complex life cycles are known to induce behavioural and physiological changes in their intermediate hosts. cyathocephalus truncatus is a manipulative parasite which infects gammarus pulex as intermediate host. g. pulex males display pre-copulatory mate guarding as a response to male-male competition for access to receptive females. in this paper, we tested the influence that c. truncatus-infection might have on male g. pulex sperm number and pairing success. we ... | 2011 | 21810304 |
| the response of intestinal mucous cells to the presence of enteric helminths: their distribution, histochemistry and fine structure. | histochemical and ultrastructural investigations were conducted on the mucous cells of the intestine of brown trout, salmo trutta l., naturally infected with the cestode cyathocephalus truncatus (pallas, 1781) and the acanthocephalan echinorhynchus truttae shrank, 1788. a subpopulation of 45 s. trutta were examined of which 15 specimens harboured e. truttae, 15 of which were infected with c. truncatus and 15 fish, the control group, were uninfected. in histological sections, hyperplasia and hype ... | 2010 | 20298449 |
| ultrastructure of microtriches on the scolex of cyathocephalus truncatus (cestoda: spathebothriidea). | the scolex surface of the mature spathebothriidean cyathocephalus truncatus (pallas, 1781), a parasite of the brown trout salmo trutta fario l., was studied using scanning and transmission electron microscopy. a particular attention was paid to microtriches, unique structure on the surface of the cestoda. the scolex of c. truncatus is covered with two types of filiform microtriches (filitriches): aciculate (approximately 3 microm long) and capillate (approximately 10 microm long). capillate micr ... | 2008 | 19175209 |
| spermiogenesis and sperm ultrastructure of cyathocephalus truncatus (pallas, 1781) kessler, 1868 (cestoda: spathebothriidea). | spermiogenesis and sperm ultrastructure of adult cyathocephalus truncatus, a member of presumably basal group of "true" cestodes (eucestoda), have been examined for the first time by using transmission electron microscopy. the process of sperm formation corresponds in basic pattern to that of the pseudophyllidea. in addition, the 2 pairs of electron-dense attachment zones are present in median cytoplasmic process of c. truncatus. however, mature spermatozoa of c. truncatus differ significantly f ... | 2006 | 17152927 |