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Registros recuperados: 37 | |
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Denayer, B.; De Ranter, K.; Van Poele, J.; Ollevier, F.P.. |
Biofouling is a very frequent and serious problem in the cooling systems of electrical power stations. An investigation is being carried out at the Doel nuclear power station to discover ways of combating micro-fouling. Micro-fouling is combated preventively and curatively using a combination of chlorine, biofilm wetting agent and dispersing agent. This treatment removes the slime layer, which can act as a primary attachment point for macro-organisms.In the study of the macro-fouling in the cooling circuits, a monitoring method was developed which uses artificial substrates to provide direct data on the colonization and growth of these organisms. On the basis of the data obtained, the treatment frequency for the prevention or combating of biofouling was... |
Tipo: Info:eu-repo/semantics/article |
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Ano: 1992 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2746 |
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Thomas, K.M.; Ollevier, F.P.. |
Hatching of eggs of <i>Anguillicola crassus</i> was studied at temperatures between 5 and 30°C. Hatching occurred between 10 and 30°C and the incubation time was inversely related to temperature. Survival, spontaneous and excitatory rate of activity of 2nd-stage larvae of <i>A. crassus</i> were also affected by temperature. The percentage of larvae eaten by <i>Paracyclops fimbriatus</i> was not always influenced by the activity of the larvae. Penetration efficiency into the haemocoel of the intermediate host was highest for freshly hatched larvae and declined gradually with age. Completely non-active larvae were still able to penetrate, although penetration efficiency was lower. |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anguillicola crassus. |
Ano: 1993 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2788 |
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Grisez, L.; Ollevier, F.P.. |
The different serotyping systems, based on thermostable O antigens, reported for <i>Vibrio anguillarum</i> and <i>V. ordalii</i> were compared by quantitative agglutination, sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and subsequent silver staining or Western blotting (immunoblotting) of purified lipopolysaccharide (LPS), using polyclonal rabbit antisera. The results demonstrate that 16 different serotypes within <i>V. anguillarum</i> (designated 01 to 016) can be distinguished. Each of these serotypes is characterized by a distinct polysaccharide banding pattern, as revealed by silver-stained gels of purified LPS. The comparative analysis allowed a complete alignment of the different stereotypes for the... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pathogens; Serology; Vibrio anguillarum. |
Ano: 1995 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2970 |
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Geets, A.; Ollevier, F.P.. |
The parasitic fauna of the alimentary tract of adult whitespotted rabbitfish, <i>Siganus sutor</i>, sampled in December 1990 at the Kenyan coast, was investigated. Five endoparasites were found: the digenean trematodes <i>Opisthogonoporoides hanumanthai, Gyliauchen papillatus</i> and <i>Hexangium sigani</i>, the acanthocephalan <i>Sclerocollum rubrimaris</i> and the nematode <i>Procammalanus elatensis</i>. No uninfected fish, nor single species infections occurred. Parasite population data showed very high prevalences for all endoparasites, ranging from 68.18% to 100%. <i>G. papillatus</i> occurred with the highest mean intensity, 201.68 ± 12.54 parasites per infected fish. The... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Siganus sutor [shoemaker spinefoot] ISW; Kenyan Coast. |
Ano: 1996 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2966 |
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Van Damme, P.; Pacolet, W.; Sulem Yong, S.; Fremaut, D.; Ollevier, F.P.. |
Two experiments were performed in order to determine the effect of supplementation of dry foods with live <i>Artemia</i> nauplii on the growth, survival, rate of cannibalism, and length-weight relationships of <i>Clarias gariepinus</i> larvae. It was found that <i>Artemia</i> -supplementation resulted in a significantly higher growth rate. The "condition", expressed as a length-weight relationship, was likewise altered after supplementation. The survival and rate of cannibalism were not influenced by supplementation. <i>Artemia</i> -supplementation of dry foods was compared with other approaches which are based on the concept of the 'adaptation weight'. |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Adaptations; Freshwater fish; Weight; Artemia; Clarias gariepinus. |
Ano: 1989 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3193 |
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Merchie, G.; Lavens, P.; Dhert, Ph.; Pector, R.; Mai Soni, A.F.; Nelis, H.; Ollevier, F.P.; De Leenheer, A.P.; Sorgeloos, P.. |
Live food enrichment techniques, using formulated diets and emulsions for improving the nutritional quality of <i>Brachionus</i> and <i>Artemia</i> , were studied as a tool for transferring ascorbic acid (AA) to fish larvae. <i>Artemia</i> nauplii enriched for 24h with an experimental emulsion containing 20% HUFA and 0%, 10% and 20% ascorbyl palmitate (AP) were administered to catfish larvae in a 20-day feeding trial. Survival was not affected by the dietary AA, but from day 7 onwards a significantly positive effect of supplemental AA on growth was demonstrated. At the end of the experiment the 20% AP group weighed 30% more than the control (0% AP), i.e. 9.5 and 6.3mg DW, respectively. Evaluation of the physiological... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Clarias gariepinus Dicentrarchus labrax (Linnaeus; 1758) [Bass]. |
Ano: 1995 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2581 |
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Huys, L.; Dhert, P.; Robles, R.; Ollevier, F.P.; Sorgeloos, P.; Swings, J.. |
The aerobic bacterial flora in the gut of turbot larvae and their influence on larval survival was examined. Two turbot experiments were run with six replicates each time. Large variation, from 0% up to 44%, was observed in the survival percentage of turbot larvae. There was no correlation between the number of bacteria present in the gut of turbot larvae and the larval survival rate. During both experiments, all replicates followed nearly the same rate of bacterial development in the gut of turbot larvae going from circa 10<sup>2</sup> CFU larva<sup>-1</sup> just before first feeding at day 3 post hatch to 10<sup>5</sup> CFU larva<sup>-1</sup> at day 9 post hatch.In total, 127 bacterial isolates from 12... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aerobic bacteria; Aquaculture; Commensals; Digestive system; Fish culture; Fish larvae; Gastrointestinal tract; Microorganisms; Rearing; Scophthalmus maximus; Survival; Bacteria; Scophthalmus maximus; Vibrio mediterranei. |
Ano: 2001 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=5720 |
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Pedersen, K.; Grisez, L.; van Houdt, R.; Tiainen, T.; Ollevier, F.P.; Larsen, J.L.. |
The present paper summarizes the serotyping scheme of the fish pathogenic bacterium <i>Vibrio anguillarum</i> and defines seven additional O-serogroups. Strains, collected in our laboratories that were nontypable with antisera against the previously defined 16 O-serotypes, were used for generating new antisera and were characterized further by means of LPS profiles, Western blots, and serological reactions. On the basis of the results, it is suggested that the seven new O-serogroups are to be included in the existing serotyping system as serotypes O17-O<sub>2</sub>3. However, the existence of further <i>V. anguillarum</i> strains that were not typable with any of the 23 O-antisera suggested the existence of additional... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacterial diseases; Fish diseases; Pathogenic bacteria; Pathogens; Serological studies; Serotypes; Strains; Vibrio anguillarum. |
Ano: 1999 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=9525 |
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Van Damme, P.A.; Ollevier, F.P.. |
Two species of <i>Lernaeocera</i> are present in the southeastern North Sea. <i>Lernaeocera lusci</i> infects bib <i>Trisopterus luscus</i>, dragonet <i>Callionymus lyra</i> and sand goby <i>Pomatoschistus minutus. L. minuta</i> is a junior synonym of <i>L. lusci.</i>. The second valid species, <i>L. branchialis</i>, infects whiting <i>Merlangius merlangus</i>. The two species can be morphologically separated by the antennary processes, which are present in <i>L. lusci</i> and absent in <i>L. branchialis</i>. Discriminant functions allow complete separation between <i>L. lusci</i> and <i>L. branchialis</i>. There... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lernaeocera Blainville; 1822. |
Ano: 1995 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3130 |
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Daemen, E.; Volckaert, F.A.M.J.; Cross, T.F.; Ollevier, F.P.. |
Clones (<i>Anguilla anguilla</i>) were obtained from a size-selected library (300-800 bp HaeIII, PvuII, EcoRV-digested inserts), by hybridization with gamma super(32)P-labelled (dG-dT) sub(15). The sequences of the loci Aan01, Aan02, Aan03 and Aan04 have been submitted to GenBank/EMBL (acc. nos U67163, U67164, U67165 and U67166). |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biomarkers Genetics Anguilla anguilla (Linnaeus; 1758). |
Ano: 1997 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2930 |
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Kime, D.E.; Ebrahimi, M.; Nysten, K.; Roelants, I.; Rurangwa, E.; Moore, H.D.M.; Ollevier, F.P.. |
Computer assisted sperm analysis (CASA) has been used to analyse the effects of cadmium and zinc on the motility of fish sperm treated either for 24h after partial dilution in an extender, or during the final dilution step on the microscope stage during video recording. The progressive motility of catfish sperm, which was not affected by storage for 24h, was decreased after exposure to 100 ppm cadmium or 2000 ppm zinc in extender for 24h. Only 1000 ppm cadmium or 2000 ppm zinc had any effect on motility when added to sperm at the final dilution stage. These results suggest that concentrations of cadmium which have been found to be present in fish gonads as a result of bioaccumulation from the water or diet may decrease the motility of sperm during... |
Tipo: Info:eu-repo/semantics/article |
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Ano: 1996 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2993 |
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Registros recuperados: 37 | |
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