Publications

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phylogenetic analysis and serotyping of vibrio splendidus-related bacteria isolated from salmon farm cleaner fish.cleaner fish, i.e. various wrasse (labridae) species and lumpsucker cyclopterus lumpus, are to an increasing extent used for biocontrol of the salmon louse lepeophtheirus salmonis in european salmon farming. although efficient de-licers, cleaner fish mortality levels in salmon farms are often high. bacterial infections are common, and vibrio splendidus-related strains are frequently identified during diagnostic investigations. the population structure of 112 v. splendidus-related isolates, deriv ...201526648104
nucleospora cyclopteri n. sp., an intranuclear microsporidian infecting wild lumpfish, cyclopterus lumpus l., in icelandic waters.commercial fisheries of lumpfish cyclopterus lumpus have been carried out in iceland for centuries. traditionally the most valuable part is the eggs which are harvested for use as a caviar substitute.previously reported parasitic infections from lumpfish include an undescribed intranuclear microsporidian associated with abnormal kidneys and mortalities in captive lumpfish in canada. during icelandic lumpfish fisheries in spring 2011, extensive enlargements to the kidneys were observed in some fi ...201323445616
previously unrecognised division within moritella viscosa isolated from fish farmed in the north atlantic.previously undocumented phenotypical and genetic variation was identified amongst isolates of moritella viscosa collected from various geographical locations and from different fish species. the studied isolates could be split into 2 major phenotypically and genetically different clusters, one of which was consistent with the species type strain (ncimb 13548). isolates consistent with the type strain originated exclusively from atlantic salmon farmed in norway, scotland and the faroe isles, alth ...201021290896
infection of wild fishes by the parasitic copepod caligus elongatus on the south east coast of norway.natural caligus elongatus nordmann infections of wild coastal fishes on the norwegian south east coast were monitored at various times of the year from 2002 to 2004. the prevalence for all coastal fish (n = 4427) pooled was 15%, and there were great differences between fish species and seasons. lumpfish cyclopterus lumpus l. spawners were the most infected fish, with a prevalence of 61% and a median intensity of 4 lice fish(-1), whereas gadids had a mean prevalence of 19% and a median infection ...200717972757
caligus elongatus nordmann genotypes on wild and farmed fish.two mitochondrial genotypes have been described for caligus elongatus nordmann in norway. this article reports on the distribution of c. elongatus mitochondrial cytochrome c oxidase 1 genotypes from wild fish hosts from the se norwegian coast. for comparison, lice from areas with fish farming were included in the study. the genotype distribution of 841 lice from wild coastal (n = 535), wild north sea pelagic (n = 26), farmed (n = 160) and wild hosts in areas of fish farming (n = 89) is presented ...200717298563
sublethal effects of a new antifouling candidate on lumpfish (cyclopterus lumpus l.) and atlantic cod (gadus morhua l.) larvae.sublethal effects of medetomidine, a new generation antifouling compound, on lumpfish (cyclopterus lumpus l.) and cod (gadus morhua l.) larvae were examined. the effects on respiration rate and on colour adaptation of newly hatched larvae were assessed after 24-96 h exposure. exposure of lumpfish larvae to the experimental concentrations resulted in a significant decrease in respiration rate (lowest observed effect concentration (loec) = 5-10 nm) and in the percentage of dark larvae (loec = 4 nm ...200516371340
first record of tetramicra brevifilum in lumpfish (cyclopterus lumpus, l.).a microsporidian species with 98.3-98.4% nucleotide identity to tetramicra brevifilum (journal of fish diseases, 3, 1980, 495) was diagnosed in lumpfish (cyclopterus lumpus, l.) broodstock held at a breeding and rearing facility in western ireland. the fish were wild-caught from the west coast of ireland, and the first case was diagnosed one year after capture. clinical signs included severe bloating, lethargy, exophthalmos, anorexia, white patches on the cornea and externally visible parasitic ...201627716959
characterization of c-reactive protein from the eggs of the marine teleost. cyclopterus lumpus l.further evidence is presented for the existence in teleost fish of proteins homologous with mammalian c-reactive protein. the amino acid composition is given for a c-reactive protein isolated from the eggs of a marine teleost, cyclopterus lumpus, by extraction with lecithin in the presence of ca2+, followed by electrofocusing. a molecular weight of 150,000 was calculated from gel filtration and electrophoresis at different polyacrylamide gel concentrations, while the s20,w was 7.4 s. the 1.5-s s ...19816796127
clinical vibrio anguillarum infection in lumpsucker cyclopterus lumpus in scotland. 201324008994
negative effects of kudoa islandica n. sp. (myxosporea: kudoidae) on aquaculture and wild fisheries in iceland.in the early 2000s, experimental rearing of spotted wolffish, anarhichas minor, was started in iceland. health surveillance, carried out at regular intervals during the rearing period, revealed persistent and highly prevalent kudoa infections of fish muscles which caused great financial losses due to post mortem myoliquefaction. in addition, during the traditional process of drying and smoking wild atlantic lumpfish, cyclopterus lumpus, the muscles from some fish almost completely disappear and ...201425161912
isolation and characterization of somatolactin genes from two cold water marine teleosts, lumpfish (cyclopterus lumpus) and halibut (hippoglossus hippoglossus).somatolactin (sl) is a newly discovered pituitary hormone structurally related to both growth hormone and prolactin. we isolated the sl gene from two cold water marine teleosts, lumpfish (cyclopterus lumpus) and halibut (hippoglossus hippoglossus). the sl genes for lumpfish were isolated from a complementary dna (cdna) library by random gene tagging and sequencing. two full-size clones of 1.2 (lfsl-6) and 1.6 (lfsl-9) kilobases (kb) were characterized. the sl genes for halibut were identified fr ...19937689905
acute and long-term biological effects of mechanically and chemically dispersed oil on lumpsucker (cyclopterus lumpus).concentration dependent differences in acute and long-term effects of a 48 h exposure to mechanically or chemically dispersed crude oil were assessed on juvenile lumpsucker (cyclopterus lumpus). acute or post-exposure mortality was only observed at oil concentrations representing higher concentrations than reported after real oil spills. acute mortality was more apparent in chemically than mechanically dispersed oil treatments whereas comparable ec50s were observed for narcosis. there was a posi ...201525637877
pasteurellosis in lumpsucker cyclopterus lumpus, farmed in norway. 201625828053
co-infection of nucleospora cyclopteri (microsporidia) and kudoa islandica (myxozoa) in farmed lumpfish, cyclopterus lumpus l., in norway: a case report.this study describes a co-infection of kudoa islandica (myxozoa) and nucleospora cyclopteri (microsporida) in farmed lumpfish, cyclopterus lumpus l., in norway. several other parasites (cryptocotyle sp., protozoan ciliates and gyrodactylus sp.) were also found in gills. in june 2013, the mortality in a farmed lumpfish population increased to 65%. lumpfish showed erratic swimming behaviour and loss of weight. at necropsy, nodules in the kidney were the only visible lesions. histologically, all fi ...201625865243
functional characterization of igm+ b cells and adaptive immunity in lumpfish (cyclopterus lumpus l.).the innate immune responses in lumpfish (cyclopterus lumpus l.) have been shown to be functional, but little is currently known about the b cells, immunoglobulins or adaptive immune responses in this species. we have used anti-igm antiserum to isolate b cells and compared them morphologically and functionally with other cell types. the fraction of igm(+) cells among isolated peripheral blood leukocytes (pbl), head kidney leukocytes (hkl) and spleen leukocytes (sl) was in the range of 40%, 12% an ...201526021455
cryopreservation of lumpfish cyclopterus lumpus (linnaeus, 1758) milt.this study has established a successful protocol to cryopreserve lumpfish cyclopterus lumpus (linnaeus, 1758) milt. three cryosolutions were tested based on mounib's medium; the original medium including reduced l-glutathione (gsh), the basic sucrose and potassium bicarbonate medium without gsh, or with hen's egg yolk (ey). dimethyl sulphoxide (dmso) was used as the cryoprotectant along with all three diluents in a 1-2 dilution. cryopreservation was performed with the mentioned cryosolutions at ...201526056612
method for quantifying nsaids and clofibric acid in aqueous samples, lumpfish (cyclopterus lumpus) roe, and zebrafish (danio rerio) eleutheroembryos and evaluation of their bioconcentration in zebrafish eleutheroembryos.pharmaceuticals such as nonsteroidal anti-inflammatory drugs (nsaids) and lipid regulators are being repeatedly detected at low concentrations (pg · ml(-1)-ng · ml(-1)) in the environment. a large fraction of these compounds are ionizable. ionized compounds show different physico-chemical properties and environmental behavior in comparison to their neutral analogs; as a consequence, the quantification methods currently available, based on the neutral molecules, might not be suitable to detect th ...201627164891
genetic structure of west greenland populations of lumpfish cyclopterus lumpus.in this study, 11 microsatellite markers were used to determine the structure of west greenlandic lumpfish cyclopterus lumpus populations across six spawning locations spanning >1500 km and compared with neighbouring populations in canada and iceland. to evaluate whether data allow for identification of origin of c. lumpus in greenlandic waters, genetic assignment analysis was performed for 86 c. lumpus sampled on a feeding migration. significant structuring with isolation by distance was observ ...201627753091
redescription and phylogenetic position of myxobolus aeglefini and myxobolus platessae n. comb. (myxosporea), parasites in the cartilage of some north atlantic marine fishes, with notes on the phylogeny and classification of the platysporina.myxobolus 'aeglefini' auerbach, 1906 was originally described from cranial cartilage of north sea haddock (melanogrammus aeglefinus), but has subsequently been recorded from cartilaginous tissues of a range of other gadoid hosts, from pleuronectids and from lumpsucker (cyclopterus lumpus) in the north atlantic and from a zoarcid fish in the japan sea (pacific). we obtained partial small-subunit rdna sequences of myxobolus 'aeglefini' from gadoids and pleuronectids from norway and iceland. the se ...201727773829
oxygen dependence of upper thermal limits in fishes.temperature-induced limitations on the capacity of the cardiorespiratory system to transport oxygen from the environment to the tissues, manifested as a reduced aerobic scope (maximum minus standard metabolic rate), have been proposed as the principal determinant of the upper thermal limits of fishes and other water-breathing ectotherms. consequently, the upper thermal niche boundaries of these animals are expected to be highly sensitive to aquatic hypoxia and other environmental stressors that ...201627591316
characterization of igm in norwegian cleaner fish (lumpfish and wrasses).the use of cleaner fish in norwegian aquaculture has to a large extent been based on wild catches, but breeding of lumpfish and ballan wrasse is currently increasing. due to disease problems and required vaccine development, tools to study immune responses and a better understanding of the immune system in these species is demanded. the present study comprises lumpfish (cyclopterus lumpus) and five species of wrasses: ballan wrasse (labrus bergylta), rock cook (centrolabrus exoletus), cuckoo wra ...201627702679
redescription and phylogenetic position of myxobolus aeglefini and myxobolus platessae n. comb. (myxosporea), parasites in the cartilage of some north atlantic marine fishes, with notes on the phylogeny and classification of the platysporina.myxobolus aeglefini auerbach, 1906 was originally described from cranial cartilage of north sea haddock (melanogrammus aeglefinus), but has subsequently been recorded from cartilaginous tissues of a range of other gadoid hosts, from pleuronectids and from lumpsucker (cyclopterus lumpus) in the north atlantic and from a zoarcid fish in the japan sea (pacific). we obtained partial small-subunit rdna sequences of myxobolus 'aeglefini' from gadoids and pleuronectids from norway and iceland. the sequ ...201627989832
pfaas in fish and other seafood products from icelandic waters.perfluorinatedalkyl acids (pfaas) are of growing concern due to possible health effects on humans. exposure assessments indicate that fish consumption is one of the major sources of perfluorooctane sulfonate (pfos) exposure to humans, one of the major pfass, whereas concerns of overestimation of this exposure source have been raised. therefore, pfaas concentrations in fish from the north atlantic (icelandic fishing grounds) in the flesh of different fish species were investigated along with more ...201424782899
characterisation of hyaluronic acid and chondroitin/dermatan sulfate from the lumpsucker fish, c. lumpus.the lumpsucker, cyclopterus lumpus, a cottoid teleost fish found in the cold waters of the north atlantic, and north pacific, was identified as a possible source of gags. the gags present in the c. lumpus dorsal hump and body wall tissue were isolated and purified. two fractions were analysed by nmr and their gag structures determined as hyaluronic acid and cs/ds chains. the latter fraction contained glca (65% of the total uronic acids) and idoa (the remaining 35%). all uronic acid residues were ...201424721047
possible causes of a harbour porpoise mass stranding in danish waters in 2005.an unprecedented 85 harbour porpoises stranded freshly dead along approximately 100 km of danish coastline from 7-15 april, 2005. this total is considerably above the mean weekly stranding rate for the whole of denmark, both for any time of year, 1.23 animals/week (ranging from 0 to 20 during 2003-2008, excluding april 2005), and specifically in april, 0.65 animals/week (0 to 4, same period). bycatch was established as the cause of death for most of the individuals through typical indications of ...201323460787
phagocytosis and respiratory burst activity in lumpsucker (cyclopterus lumpus l.) leucocytes analysed by flow cytometry.in the present study, we have isolated leucocytes from peripheral blood, head kidney and spleen from lumpsucker (cyclopterus lumpus l.), and performed functional studies like phagocytosis and respiratory burst, as well as morphological and cytochemical analyses. different leucocytes were identified, such as lymphocytes, monocytes/macrophages and polymorphonuclear cells with bean shaped or bilobed nuclei. in addition, cells with similar morphology as described for dendritic cells in trout were ab ...201223112870
myxobolus albi infection in cartilage of captive lumpfish (cyclopterus lumpus).myxobolus albi was diagnosed in the cartilage of captive lumpfish (cyclopterus lumpus) from 2 public aquaria. eleven fish were affected, with the most common clinical signs being exophthalmos and grossly visible 1- to 2-mm white to tan scleral nodules. myxozoan cysts were identified in the cartilage of the skull, branchial arch, sclera, vertebrae, tongue, all fin insertions, and the pectoral girdle. cysts resulted in expansile, deforming, space-occupying lesions, resulting in exophthalmos but of ...201222529118
protection and antibody reactivity following vaccination of lumpfish (cyclopterus lumpus l.) against atypical aeromonas salmonicida.atypical aeromonas salmonicida is frequently associated with disease and mortality in farmed lumpfish (cyclopterus lumpus l). challenge experiments using different modes of exposure identified both high and low pathogenic isolates. intraperitoneal vaccination induced production of high levels of specific antibodies particularly in fish given multiple injections. the immune sera contained antibodies cross reactive with both high and low pathogenic isolates. sds-page and lc/msms analyses showed th ...201728344167
the effect of prey density on foraging mode selection in juvenile lumpfish: balancing food intake with the metabolic cost of foraging.1. in many species, individuals will alter their foraging strategy in response to changes in prey density. however, previous work has shown that prey density has differing effects on the foraging mode decisions of ectotherms as compared with endotherms. this is likely due to differences in metabolic demand; however, the relationship between metabolism and foraging mode choice in ectotherms has not been thoroughly studied. 2. juvenile lumpfish cyclopterus lumpus forage using one of two modes: the ...200717584387
startle responses of fish without mauthner neurons: escape behavior of the lumpfish (cyclopterus lumpus). 200011081724
inter-decadal patterns of population and dietary change in sea otters at amchitka island, alaska.after having been hunted to near-extinction in the pacific maritime fur trade, the sea otter population at amchitka island, alaska increased from very low numbers in the early 1900s to near equilibrium density by the 1940s. the population persisted at or near equilibrium through the 1980s, but declined sharply in the 1990s in apparent response to increased killer whale predation. sea otter diet and foraging behavior were studied at amchitka from august 1992 to march 1994 and the data compared wi ...200028308190
further observations on cryptobia dahli (mastigophorea: kinetoplastida) parasitizing marine fish.studies were conducted primarily to ascertain the mode of transmission of cryptobia dahli parasitizing the digestive tract of lumpfish (cyclopterus lumpus). another flagellate, morphologically similar to c. dahli, was also observed in the gut of a deepsea fish (macrourus berglax). several invertebrates, which are food for lumpfish, were examined for flagellates, but were neither infected nor showed evidence of cystic stages. parasites were more abundant in the stomach, especially at about ph 5, ...20091787422
mucochondroid (mucous connective) tissues in the heads of teleosts.the distribution and structure of mucochondroid tissues in the heads of teleosts has been studied in 56 species from 26 families. the tissues could also be called mucous connective tissue and have previously been known as basophilic gelatinous tissue. they are a heterogeneous group of tissues that contain fibroblasts (type example--the subcutaneous mucochondroid of the cobitidae) or hyaline cells (type example--the mucochondroid around the medulla oblongata and spinal cord of rasbora heteromorph ...19883177897
lernaeocera branchialis: a potential pathogen to cod ranching.a study was carried out to determine the effect of lernaeocera branchialis on atlantic cod infected in the laboratory and in the field and also to ascertain its effect on cod-ranching. sixty-four percent (308) of 481 cod acquired infections in the laboratory and 33% (159) of the infected fish died over a 4-yr period. about 74% of the deaths occurred within 4 mo of the infection. monthly samples of cod collected adjacent to a cod-ranching operation showed an initial prevalence of 30% that subsequ ...19902254826
characteristics of a proteinase from ovarian fluid of the lumpsucker (cyclopterus lumpus l.).1. a proteinase has been isolated from the ovarian fluid of the lumpsucker (cyclopterus lumpus). 2. the enzyme was purified essentially to homogeneity by a one step purification procedure using anion-exchange chromatography. 3. the mol. wt of the denatured enzyme is approximately 20,000 as judged by sds-polyacrylamide gel electrophoresis. 4. the enzyme is inhibited by serine-proteinase inhibitors and acts in the manner of a trypsin-type proteinase both with respect to specific peptide substrates ...19883224504
flow cytometry analyses of phagocytic and respiratory burst activities and cytochemical characterization of leucocytes isolated from wrasse (labrus bergylta a.).we have isolated leucocytes from peripheral blood (pbl), head kidney (hkl) and spleen (sl) of wrasse (labrus bergylta a.) and studied the innate immune responses phagocytosis and respiratory burst using flow cytometry. further, we have characterized the phenotypic properties of the leucocytes by cytochemical staining. we could differentiate between several subsets of leucocytes; lymphocytes, monocytes/macrophages, neutrophils, eosinophils, basophils and small leucocytes that might be precursor o ...201424798992
observations of growth and postspawning survival of lumpfish cyclopterus lumpus from mark-recapture studies.growth and postspawning survival of lumpfish cyclopterus lumpus are described by mark-recapture experiments using juveniles in offshore areas in the north-east atlantic ocean and spawning adults in coastal norway and iceland. a female fish tagged as a juvenile and recaptured as an adult matured in a period of 18 months, providing the first observation on development in a wild c. lumpus. the von bertalanffy growth function, fitted to data from recaptured fish, was used to estimate k and l∞ and re ...201424890411
isolation of a c-reactive protein-like precipitin from the eggs of the lumpsucker (cyclopterus lumpus l.). 197833003
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