Publications

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colonization and establishment of pomphorhynchus laevis (acanthocephala) in an isolated english river.the successful colonization, establishment and spread of pomphorhynchus laevis in a small, isolated, devon river 128 km from the parasite's nearest focus in dorset was followed over 11 years from 1985. the parasite was first detected in anguilla anguilla and platichthys flesus in 1988: by 1995 it had attained prevalence levels of 22.6% in a. anguilla and 43.6% in p. flesus and also occurred in 100% salmo trutta, 50% cottus gobio and noemacheilus barbatulus. as judged by prevalence, abundance, pr ...19968991914
an investigation into the prevalence of renibacterium salmoninarum in farmed rainbow trout, oncorhynchus mykiss (walbaum), and wild fish populations in selected river catchments in england and wales between 1998 and 2000.a cross-sectional survey of renibacterium salmoninarum infection in farmed rainbow trout (rbt) and wild fish populations was carried out in 10 farms and six river catchments, respectively, in england and wales. the majority of the wild fish were sampled in 1998 and the farmed fish in 2000. grayling, thymallus thymallus, and brown trout, salmo trutta, were the main wild species sampled. two fish, one grayling and one salmon, salmo salar, were r. salmoninarum culture-positive, compared with 40 con ...200818234016
The effect of metal pollution on the population genetic structure of brown trout (Salmo trutta L.) residing in the River Hayle, Cornwall, UK.The River Hayle in south-west England is impacted with metals and can be divided into three regions depending on the copper and zinc concentrations: a low-metal upper section; a highly-contaminated middle section and a moderately contaminated lower section. Hayle river water is toxic to metal-naive brown trout, but brown trout are found in the upper and lower regions. The study aimed to evaluate the population genetic structure of River Hayle brown trout and to determine if the highly-contaminat ...201121885173
phylogeographic structure of brown trout salmo trutta in britain and ireland: glacial refugia, postglacial colonization and origins of sympatric populations.the phylogeographical structure of brown trout salmo trutta in britain and ireland was studied using polymerase chain reaction-restriction fragment length polymorphism (pcr-rflp) analysis of four mitochondrial dna segments (16s/nd1, nd5/6, coxiii/nd5 and nd5/12s). analysis of 3636 individuals from 83 sites-morphotypes revealed a total of 25 haplotypes. these haplotypes were nested in seven two-step clades. although there was a clear geographical patterning to the occurrence of derived clades, ad ...201020738710
stochastic simulation of live salmonid movement in england and wales to predict potential spread of exotic pathogens.the anthropogenic movement of live fish has been identified as the most important route for the transmission of disease between river catchments. to assist in contingency planning for exotic salmonid disease outbreaks, a stochastic model was developed to assess the potential geographic distribution of an introduced pathogen with time to first detection. the live fish movement database (a resource funded by the uk department for environment, food and rural affairs [defra] and managed by the centr ...200617140134
comparison of morphological characters in irish and english populations of the acanthocephalan pomphorhynchus laevis (müller, 1776).pomphorhynchus laevis is believed on ecological evidence to exist as three strains in the british isles. however, the strains have never been shown to be capable of being distinguished using morphological characters. a morphological comparison was made between a sample of p. laevis from salmo trutta in l. feeagh in the west of ireland and a sample from leuciscus cephalus in r. culm in the south of england. the length and width of the trunk, neck, bulb, proboscis and hooks were measured. the numb ...200415477755
ectoparasitic species of the genus trichodina (ciliophora: peritrichida) parasitising british freshwater fish.seven species of the genus trichodina ehrenberg, 1838 were identified during a sampling programme of twenty freshwater fish species from approximately sixty sites in scotland, england and wales. species found include: trichodina acuta lom, 1961 from cyprinus carpio l., carassius auratus l., oncorhynchus mykiss (walbaum), salmo trutta l. and phoxinus phoxinus l.; trichodina domerguei wallengren, 1897 from gasterosteus aculeatus l.; trichodina tenuidens faure-fremiet, 1944 from gasterosteus aculea ...19989805782
an assessment of the variation in the prevalence of renal myxosporidiosis and hepatitis in wild brown trout, salmo trutta l., within and between rivers in south-west england.the prevalence of renal myxosporidiosis in wild brown trout, salmo trutta, in seven river catchments in south-west england was investigated. three hundred and twenty-seven fish were sampled from 16 sites, of which 54 (16.5%) were found, by histological examination of the kidney, to be infected with tetracapsuloides bryosalmonae, the causative agent of proliferative kidney disease. no t. bryosalmonae infected fish were found in one river catchment, in other catchments the prevalence ranged from 2 ...200818681903
evaluating the effectiveness of restoring longitudinal connectivity for stream fish communities: towards a more holistic approach.a more holistic approach towards testing longitudinal connectivity restoration is needed in order to establish that intended ecological functions of such restoration are achieved. we illustrate the use of a multi-method scheme to evaluate the effectiveness of 'nature-like' connectivity restoration for stream fish communities in the river deerness, ne england. electric-fishing, capture-mark-recapture, pit telemetry and radio-telemetry were used to measure fish community composition, dispersal, fi ...201627423105
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