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Your search keyword '"Brevik, Øyvind Jakobsen"' showing total 13 results
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13 results on '"Brevik, Øyvind Jakobsen"'

4. Gut immune functions and health in Atlantic salmon (Salmo salar) from late freshwater stage until one year in seawater and effects of functional ingredients: A case study from a commercial sized research site in the Arctic region

Author

Wang, Jie, primary, Kortner, Trond M., additional, Chikwati, Elvis M., additional, Li, Yanxian, additional, Jaramillo-Torres, Alexander, additional, Jakobsen, Jan Vidar, additional, Ravndal, Jarle, additional, Brevik, Øyvind Jakobsen, additional, Einen, Olai, additional, and Krogdahl, Åshild, additional

Published
2020
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11. Variable Number of Tandem Repeats (VNTR) analysis of Flavobacterium psychrophilum from salmonids in Chile and Norway

Author

Apablaza, Patricia, Brevik, Øyvind Jakobsen, Mjøs, Svein Are, Valdebenito, Samuel, Ilardi, Pedro, Battaglia, Juan, Dalsgaard, Inger, and Nylund, Are

Subjects
Landbruks- og fiskerifag: 900::Fiskerifag: 920::Fiskehelse : 923 [VDP], Genotyping, Characterization, VNTR, Wild, Aquaculture, Minisatellite Repeats, Flavobacterium, Fish Diseases, SDG 3 - Good Health and Well-being, Flavobacteriaceae Infections, Landbruks- og fiskerifag: 900::Fiskerifag: 920::Akvakultur: 922 [VDP], Flavobacterium psychrophilum, Animals, Chile, Salmonid, Phylogeny, PCA, Norway, Agriculture and fisheries science: 900::Fisheries science: 920::Aquaculture: 922 [VDP], Commerce, Farmed, Gene Expression Regulation, Bacterial, veterinary(all), Salmonidae, Research Article, Agriculture and fisheries science: 900::Fisheries science: 920::Fish health: 923 [VDP]
Abstract

Background Flavobacterium psychrophilum causes serious fish diseases such RTFS and BCWD, affecting the aquaculture industry worldwide. Commercial vaccines are not available and control of the disease depends on the use of antibiotics. Reliable methods for detection and identification of different isolates of this bacterium could play an important role in the development of good management strategies. The aim of this study was to identify genetic markers for discrimination between isolates. A selection of eight VNTRs from 53 F. psychrophilum isolates from Norway, Chile, Denmark and Scotland were analyzed. The results were compared with previous work on the same pathogen using MLST for genetic differentiation. Results The VNTR analysis gave a separation between the F. psychrophilum isolates supporting the results of previous MLST work. A higher diversity was found among the Chilean isolates compared to those from Norway, which suggests a more homogenous reservoir in Norway. Transgenerational transmission of F. psychrophilum from other countries, exporting salmon embryos to Chile, may explain the differences in diversity. The same transmission mechanisms could also explain the wide geographical distribution of identical isolates in Norway. But, this could also be a result of movement of smolts and embryos. The selected VNTRs are stable genetic markers and no variation was observed after several passages on agar plates at different temperatures. Conclusions These VNTRs are important additions for genotyping of F. psychrophilum isolates. Future studies on VNTRs of F. psychrophilum should include isolates from more host species from a wider geographical area. To get a more robust genotyping the VNTRs should be used in concert with MLST. Future studies of isolates with high and low virulence should focus on identifying virulence markers using VTNRs and MLST. Electronic supplementary material The online version of this article (doi:10.1186/s12917-015-0469-7) contains supplementary material, which is available to authorized users.

Published
2015

13. Primary Isolation and Characterization of Tenacibaculum maritimumfrom Chilean Atlantic Salmon Mortalities Associated with a Pseudochattonellaspp. Algal Bloom

Author

Apablaza, Patricia, Frisch, Kathleen, Brevik, Øyvind Jakobsen, Småge, Sverre Bang, Vallestad, Camilla, Duesund, Henrik, Mendoza, Julio, and Nylund, Are

Abstract

This study presents the first isolation of Tenacibaculum maritimumfrom farmed Atlantic Salmon Salmo salarin Chile. The isolate, designated T. maritimumCh-2402, was isolated from gills of Atlantic Salmon at a farm located in region X, Los Lagos, Chile, during the harmful algal bloom caused by Pseudochattonellaspp. in February 2016. The algal bloom is reported to have caused 40,000 metric tons of mortality in this salmon farming area. The bacterium T. maritimum, which causes tenacibaculosis, is recognized as an important pathogen of marine fish worldwide. Genetic, phylogenetic, and phenotypic characterizations were used to describe the T. maritimumCh-2402 isolate. The isolate was similar to the type strain of T. maritimumbut was genetically unique. Tenacibaculum dicentrarchiisolates were also recovered during sampling from the same farm. Based on the fact that T. maritimumhas been shown to cause disease in Atlantic Salmon in other regions, the presence of this bacterium poses a potential risk of disease to fish in the Chilean aquaculture industry. Received November 6, 2016; accepted May 29, 2017 Published online July 26, 2017

Published
2017
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