Browsing Brage IMR by Subject "VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923"
Now showing items 141-160 of 753
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Evidence of salmon lice-induced mortality of anadromous brown trout (Salmo trutta) in the Hardangerfjord, Norway
(Journal article; Peer reviewed, 2013-10-15)The Hardangerfjord, western Norway, is an area with a high concentration of salmon farms, high levels of infection of salmon lice in anadromous brown trout, and declining trout populations. This study assessed the marine ... -
Evidence of sampling induced biases in mortality estimates from experiments investigating mortality in fish escaping from towed fishing gears
(ICES CM Documents;2002/V:25, Working paper, 2002)When studying escapes from trawl codends and other selective devices, the most common method of capturing or ‘sampling’ escaping fish is using a codend cover (Figure 1). This paper will summarise a programme of work providing ... -
Evidence of sampling induced biases in mortality estimates from experiments investigating mortality in fish escaping from towed fishing gears
(ICES CM Documents;2002/V:25, Working paper, 2002)When studying escapes from trawl codends and other selective devices, the most common method of capturing or ‘sampling’ escaping fish is using a codend cover (Figure 1). This paper will summarise a programme of work providing ... -
Experimental Evidence of Threat-Sensitive Collective Avoidance Responses in a Large Wild-Caught Herring School
(Journal article; Peer reviewed, 2014-01-29)Aggregation is commonly thought to improve animals' security. Within aquatic ecosystems, group-living prey can learn about immediate threats using cues perceived directly from predators, or from collective behaviours, for ... -
Extensive gas bubble release in Norwegian spring spawning herring (Clupea harengus) during predator avoidance
(ICES CM Documents;1998/J:20, Working paper, 1998)Events of extensive gas bubble releases in overwintering Norwegian spring spawning herring (Clupea harengus) were repeatedly observed acoustically and visually in Vestfjorden, northem Norway, during attacks from killer ... -
Extinction cross section of herring: New measurements and speculation
(ICES CM Documents;1994/(B+D+G+H):2, Working paper, 1994)Acoustic abundance estimation of dense, vertically extended aggregations of fish requires knowledge of the extinction cross section. An established method based on a comparison of the area backscattering coefficients ... -
Factors affecting the distribution of wrasses in a fjord system: analysis by generalised linear models
(ICES CM Documents;2000/N:31, Working paper, 2000)Background: Generalised linear models (GLMs, see McCullagh & Nelder 1989) form a modern, flexible and unified approach to statistical modelling. GLMs are of particular value to the analysis of data from ecological surveys, ... -
Fangst og bruk av leppefisk - innenfor bærekraftige rammer?
(Havforskningsnytt;Nr. 6 - 2011, Working paper, 2011)Bruk av leppfisk regnes som den eneste metoden for bekjempelse av lakselus som ikke har negative konsekvenser for miljøet. Bruken har økt kraftig de siste årene – i takt med problemene med lakselus. At lakselus enkelte steder ... -
Fant lite lakselus under villaksens utvandring i 2009 : Reduced levels of salmon lice found during wild salmon migration in 2009
(Havforskningsnytt, Working paper, 2009)When the Atlantic salmon migrate to the sea during spring and early summer, the levels of salmon lice are recorded in selected fjord systems. In 2009, in both the Hardangerfjord and the Hjeltefjord, the levels of salmon ... -
Fate of Francisella noatunensis, a pathogen of Atlantic cod Gadus morhua, in blue mussels Mytilus edulis
(Journal article; Peer reviewed, 2012-02-17)Francisellosis, caused by the bacterium Francisella noatunensis, is one of the most severe diseases affecting farmed cod, and has caused great economic loss for the cod farming industry in Norway. We studied the fate of ... -
Får oppdrettslaks nok oksygen?
(Havforskningstema;1-2013, Working paper, 2013) -
Fecundity and maturity of cod (Gadus morhua L.) from northern Norway
(ICES CM Documents;1988/G:28, Working paper, 1988)The fecundity was determined for cod caught during March 1986 and 1987 in the region Lofoten - Malangsgrunnen, northern Norway. No significant difference in fecundity appeared between the two years. -
Fecundity of sprat from the Norwegian coast
(ICES CM Documents;1985/H:56, Working paper, 1985) -
Feeding and migration of Norwegian spring spawning herring in the Norwegian Sea
(ICES CM Documents;1994/R:9, Working paper, 1994)After spawning on the shelf off Møre, Western Norway, the spawning stock of Norwegian spring spawning herring migrates to the Norwegian Sea for feeding. Simultaneously, the adolescent part of the stock leaves the wintering ... -
Feeding in a heterogeneous environment: spatial dynamics in summer foraging Barents Sea cod
(Journal article; Peer reviewed, 2012-07-03)Cod Gadus morhua are important predators in many ecosystems in the North Atlantic, but their ecological importance has diminished in many areas due to stock size reductions. In contrast, the Barents Sea cod stock is ... -
Feeding preference of recaptured Atlantic salmon Salmo salar following simulated escape from fish pens during autumn
(Journal article; Peer reviewed, 2010-12-21)Escapes of farmed fish from coastal farms around the world are believed to have genetic and ecological consequences for wild fish populations. Each year there are numerous escapes of adult farmed Atlantic salmon Salmo ... -
Feeding preference of recaptured Atlantic salmon Salmo salar following simulated escape from fish pens during autumn
(Journal article; Peer reviewed, 2010-12-21)Escapes of farmed fish from coastal farms around the world are believed to have genetic and ecological consequences for wild fish populations. Each year there are numerous escapes of adult farmed Atlantic salmon Salmo ... -
Field studies of harp seal (Phoca Groenlandica) distribution and feeding ecology in the Barents Sea in september 1990
(ICES CM Documents;1991/N:3, Working paper, 1991)The harp seal Phoca groenlandica is the most abundant seal species in the Barents Sea, and it may be a significant predator on other marine resources in this area. In order to evaluate the ecological role of harp seals, ... -
First detection of piscine reovirus (PRV) in marine fish species
(Journal article; Peer reviewed, 2012-01-24)Heart and skeletal muscle inflammation (HSMI) is a disease that affects farmed Atlantic salmon Salmo salar L. several months after the fish have been transferred to seawater. Recently, a new virus called piscine reovirus ... -
Fiskeridirektoratets skrifter serie havundersøkelser vol. 17, no. 4
(Fiskeridirektoratets skrifter, Serie Havundersøkelser;vol 17 no 4, Research report, 1981)