| taxonomy, prevalence, and experimental transmission of a protozoan parasite, trichodina oviducti polyanskii (ciliata: peritrichida) of the thorny skate, raja radiata donovan. | | 1972 | 4626892 |
| revision of the grillotia erinaceus (van beneden, 1858) species complex (cestoda: trypanorhyncha), with the description of g. brayi n. sp. | members of the trypanorhynch cestode genus grillotia guiart, 1927 belonging to the grillotia erinaceus (van beneden, 1858) species complex are redescribed. the type-species of the genus, g. erinaceus, is redescribed from raja spp. in the eastern and western north atlantic and the mediterranean. the redescription establishes the presence of: an hermaphroditic sac; internal and external seminal vesicles (but absence of an accessory seminal vesicle); a uterine pore; and the attachment of the retrac ... | 2007 | 17417717 |
| establishment of the onset of host specificity in four phyllobothriid tapeworm species (cestoda: tetraphyllidea) using a molecular approach. | a parasitological survey in the bay of fundy, canada, resulted in the recovery of mature specimens from 5 species of phyllobothriid tapeworms (cestoda: tetraphyllidea) from 4 rajid skates: echeneibothrium canadensis and e. dubium abyssorum specimens from amblyraja radiata; e. vernetae and pseudanthobothrium n.sp. from leucoraja erinacea and l. ocellata; and p. hanseni from a. radiata and malacoraja senta. partial sequence data of a variable region (d2) from the large subunit ribosomal dna (lsu) ... | 2007 | 17462121 |
| redescription of pseudanthobothrium hanseni baer, 1956 and description of p. purtoni n. sp. (cestoda: tetraphyllidea) from different pairs of rajid skate hosts, with comments on the host-specificity of the genus in the northwest atlantic. | during a parasitological survey of leucoraja erinacea, l. ocellata, malacoraja senta and amblyraja radiata from passamaquoddy bay and waters surrounding the west isles of the bay of fundy, nb, canada, seven species of cestodes were recovered. examination of these skates revealed the presence of two distinct species of pseudanthobothrium baer, 1956: one was retrieved from m. senta and a. radiata, identified as p. hanseni baer, 1956 and redescribed herein; the other was retrieved from l. erinacea ... | 2008 | 18373219 |
| determinants of host specificity and comments on attachment site specificity of tetraphyllidean cestodes infecting rajid skates from the northwest atlantic. | the objectives of this study were to (1) describe the host range for 6 tetraphyllidean species and quantify their host specificity using 5 specificity indices; (2) determine the role of morphological determinants in the host specificity of tetraphyllideans by comparing villar and bothridial measurements of species examined herein; and (3) determine the role of a physiological component in the host specificity of tetraphyllideans by exposing tetraphyllideans to blood sera from different fish spec ... | 2008 | 18564745 |
| reproductive characteristics and population decline of four species of skate (rajidae) off the eastern coast of canada. | four of the most common species of skate (rajidae) were studied off eastern canada to determine if their reproductive characteristics were linked to their population trajectories. the fecundity of the winter skate leucoraja ocellata, the little skate leucoraja erinacea, the thorny skate amblyraja radiata and the smooth skate malacoraja senta averaged between 41 and 56 egg cases per year for each species. for all species but l. ocellata, males matured at larger sizes and at later ages than female ... | 2009 | 20738493 |
| permanent genetic resources added to molecular ecology resources database 1 december 2009-31 january 2010. | this article documents the addition of 220 microsatellite marker loci to the molecular ecology resources database. loci were developed for the following species: allanblackia floribunda, amblyraja radiata, bactrocera cucurbitae, brachycaudus helichrysi, calopogonium mucunoides, dissodactylus primitivus, elodea canadensis, ephydatia fluviatilis, galapaganus howdenae howdenae, hoplostethus atlanticus, ischnura elegans, larimichthys polyactis, opheodrys vernalis, pelteobagrus fulvidraco, phragmidiu ... | 2010 | 21565062 |
| quantification of testosterone and testosterone glucuronide in testicular and peripheral plasma of mature thorny skate (raja radiation). | | 2015 | 4635471 |
| ultrastructural characteristics of the caeca of basal polyopisthocotylean monogeneans of the families chimaericolidae and hexabothriidae parasitic on cartilaginous fishes. | ultrastructural differences are shown between the caecal organization in three blood-feeding polyopisthocotylean monogeneans, i.e., the chimaericolid chimaericola leptogaster from the holocephalan chimaera monstrosa and two hexabothriids, callorhynchocotyle callorhynchi from the holocephalan callorhynchus capensis and rajonchocotyle emarginata from the elasmobranch amblyraja radiata. in c. leptogaster, digestive cells and connecting syncytium, joined close to the luminal surface by septate junct ... | 2015 | 25869960 |
| spermatological characteristics of the enigmatic monogenean dictyocotyle coeliaca nybelin, 1941 (monopisthocotylea: monocotylidae) reveal possible adaptation to endoparasitism. | spermatological characters of dictyocotyle coeliaca nybelin, a unique endoparasitic monogenean from the body cavity of the ray amblyraja radiata (elasmobranchii: rajidae), was investigated by means of scanning and transmission electron microscopy for the first time. the process of the spermatozoon formation begins with the appearance of the differentiation zone which contains two centrioles. subsequently developed two free flagella rotate to lie parallel before their fusing. after fusion, both t ... | 2017 | 28030332 |
| surface ultrastructural characteristics of dictyocotyle coeliaca nybelin, 1941 (monopisthocotylea: monocotylidae), an endoparasitic monogenean of rays. | scanning and transmission electron microscopical observations were made of the surface topography of dictyocotyle coeliaca (nybelin, 1941) (monopisthocotylea: monocotylidae), a unique endoparasitic monogenean from the body cavity of the ray amblyraja radiata (elasmobranchii: rajidae). scanning investigation show the presence on the ventral side of the anterior body of smooth areas with pit-like depressions and shallow ridges, whereas the tegument of the middle and posterior regions of the body i ... | 2016 | 26614359 |
| numerical and functional responses of intestinal helminths in three rajid skates: evidence for competition between parasites? | host-parasite interactions generally involve communities of parasites. within these communities, species will co-exist and/or interact with one another in a manner either benefiting the species involved or to the detriment of one or more of the species. at the level of helminth infracommunities, evidence for intra- and inter-specific competition includes numerical responses, i.e. those regulating helminth intensity of infection, and functional responses, i.e. where the presence of competitors mo ... | 2012 | 22894877 |
| descriptions and revised key to the eggcases of the skates (rajiformes: rajidae) and catsharks (carcharhiniformes: scyliorhinidae) of the british isles. | updated descriptions and measurements for the eggcases of 10 rajiform and three scyliorhinid species occurring in the shelf seas around the british isles are given, based on museum material, specimens collected during the 'great eggcase hunt' (a shark trust recording project), and specimens obtained from fishery surveys. quantitative data are given for amblyraja radiata (n = 94), dipturus batis (n = 24), d. cf. intermedia (n = 33), leucoraja naevus (n = 94), raja brachyura (n = 53), r. clavata ( ... | 2016 | 27515657 |
| ultrastructural observations of the attachment organs of the monogenean rajonchocotyle emarginata (olsson, 1876) (polyopisthocotylea: hexabothriidae), a gill parasite of rays. | the present study uses scanning and transmission electron microscopical observations to examine the haptoral features of the hexabothriid polyopisthocotylean monogenean rajonchocotyle emarginata from the gills of the elasmobranch amblyraja radiata. the haptor possesses six equal, pedunculate suckers, each armed with a large, curved, hooked sclerite, and an appendix bearing two small, terminal suckers and a pair of minute hamuli. the outer side of the distal region of the hooked sclerite forms a ... | 2016 | 26927870 |
| reproductive biology of the southern thorny skate amblyraja doellojuradoi (chondrichthyes, rajidae). | the total lengths (l(t)) of 193 males (209-556 mm) and 130 females (275-515 mm) of amblyraja doellojuradoi, a commercial by-catch species on the argentinean continental shelf, which are increasingly retained, were analysed. no sexual dimorphism was observed in the l(t) at which 50% of individuals were sexually mature; males matured at 448 mm and females at 411 mm, c. 80 and 82% of maximum l(t). the hepato-somatic index was similar among sexes, but significantly different between maturity stages, ... | 2016 | 26923668 |
| spatial distribution of fishes in a northwest atlantic ecosystem in relation to risk of predation by a marine mammal. | 1. numerous studies have shown that, at spatial scales of metres to several kilometres, animals balance the trade-off between foraging success and predation mortality by increasing their use of safer but less profitable habitats as predation risk increases. however, it is less clear whether prey respond similarly at the larger spatiotemporal scales of many ecosystems. 2. we determine whether this behaviour is evident in a large marine ecosystem, the southern gulf of st. lawrence (sgsl, 75 000 km ... | 2015 | 25976520 |
| merizocotyle euzeti sp. n. (monogenea: monocotylidae) from the nasal tissue of three deep sea skates (rajidae) in the southwestern atlantic ocean. | a new species of merizocotyle cerfontaine, 1894 (monogenea: monocotylidae) is described from the nasal tissues of three deep sea rajid skates: the southern thorny skate, amblyraja doellojuradoi (pozzi), broadnose skate, bathyraja brachyurops (fowler), and yellownose skate, zearaja chilensis (guichenot), collected off buenos aires province, argentina, southwest atlantic ocean. two additional species of sympatric rajid, the white-dotted skate, bathyraja albomaculata (norman), and the patagonian sk ... | 2014 | 25065126 |
| enantiomer-specific analysis of hexabromocyclododecane in fish from etnefjorden (norway). | high-performance liquid chromatography tandem mass spectrometry (hplc-ms/ms) was applied to sterospecifically quantify the content of alpha-, beta-, and gamma-hexabromocyclododecane (hbcd) in six fish species from the norwegian etnefjorden. a combination of a beta-pm cyclodextrin and an achiral column enabled the paired chromatographic separation of the stereoisomers in the order (-)-alpha-, (+)-alpha-, (-)-beta-, (+)-beta-, (+)-gamma- and, (-)-gamma-hbcd. the limits of detection were in the ran ... | 2010 | 20605040 |
| captive breeding of the barndoor skate (dipturus laevis) at the montreal biodome, with comparison notes on two other captive-bred skate species. | in 1997, the montreal biodome obtained five barndoor skates (dipturus laevis) from the waters off boston, massachusetts. six years later, those specimens began reproducing, and the first egg case was collected in november 2003. since then, 73 hatchlings have been born and raised. egg cases were observed year round, and annual fecundity was measured for the first time: one female laid 69 eggs in 2005, 85 in 2006 and 115 in 2007. egg incubation was longer than believed previously, ranging from 342 ... | 2008 | 19360612 |
| disposition of 1-[14c]phenyl-1-(3,4-dimethyl) phenylethane, a component of some pcb replacement materials, following intravenous administration to the thorny skate, raja radiata. | 1-[14c]phenyl-1-(3,4-dimethyl)phenylethane ([14c]pxe), a labelled analogue of a component of some commercial pcb replacement materials, was cleared rapidly from plasma of the thorny skate, raja radiata, after i.v. injection. a polyexponential fit to the clearance data yielded three linear components with half-lives of 7, 128 and 924 min. the metabolic clearance rate for the mean animal was approximately 41 x kg-1 x d-1. the main storage site for [14c]pxe was the liver, which contained about 40% ... | 1986 | 2871995 |
| disposition of diphenyl ether following intravenous administration to thorny skate (raja radiata). | | 1978 | 33000 |
| the fate of 2-, 3-, and 4-chlorobiphenyl following intravenous administration to the thorny skate (raja radiata) and the winter skate (raja ocellata). | | 1974 | 4208175 |