scholarly journals System-specific salmon louse infestation thresholds for salmon farms to minimize impacts on wild sea trout populations

2021 ◽  
Author(s):  
S Shephard ◽  
P Gargan
Keyword(s):  
Louse Infestation ◽  
Salmon Louse ◽  
Sea Trout

scholarly journals Salmon louse infestation levels on sea trout can be predicted from a hydrodynamic lice dispersal model

2021 ◽  
Author(s):  
Thomas Bøhn ◽  
Rune Nilsen ◽  
Karl Øystein Gjelland ◽  
Martin Biuw ◽  
Anne Dagrun Sandvik ◽  
...  
Keyword(s):  
Louse Infestation ◽  
Salmon Louse ◽  
Sea Trout ◽  
Dispersal Model

scholarly journals Salmon louse infestation in wild brown trout populations generates multi-modal mixture distributions

2020 ◽  
Vol 12 ◽  
pp. 447-456
Author(s):  
OH Diserud ◽  
R Hedger ◽  
B Finstad ◽  
D Hendrichsen ◽  
AJ Jensen ◽  
...  
Keyword(s):  
Habitat Use ◽  
Brown Trout ◽  
Negative Binomial ◽  
Louse Infestation ◽  
Marine Habitat ◽  
Salmon Louse ◽  
Sea Trout ◽  
Salmon Lice ◽  
Temporal Variance ◽  
Spatio Temporal

For successful evaluation of the overall effects of salmon louse infestation on brown trout population dynamics, it is crucial to have a realistic understanding of how lice infestation distributions are generated and how they should be interpreted. Here, we simulated the potential effects of spatio-temporal variance in lice larvae densities, temporal variance in sea trout marine migration timing and spatial variance in marine habitat use on lice infestation distributions. We show that, when sampling populations with individual variation in marine behaviour, e.g. from post-smolts to veteran migrants, we must expect multi-modal mixture lice infestation distributions. Applying standard statistical distributions, such as the Poisson, negative binomial or zero-inflated distributions, can be too simplistic and give biased results. Temporary increases in salmon lice load in a given area may have inconsistent effects among individuals of a population and may be critical for vulnerable groups such as post-smolts, dependent on timing. For many analyses, it will be necessary to resolve the contributions from groups of fish with different lice infestation expectations due to spatio-temporal differences in habitat use within the overall mixture distribution. Another consequence is that different data sources, obtained by different methods or sampled at different locations and periods, must be expected to give different lice infestation distributions, even when sampling the same population. We also discuss additional factors that may complicate the interpretation of salmon lice infestation distributions on sea trout, such as lice-induced mortality, and behavioural changes, such as premature return to less saline water for delousing.

Ultrasound as potential inhibitor of salmon louse infestation-A small-scale study

2018 ◽  
Vol 49 (8) ◽  
pp. 2684-2692 ◽  
Author(s):  
Martin H Skjelvareid ◽  
Mette S W Breiland ◽  
Atle Mortensen
Keyword(s):  
Small Scale ◽  
Louse Infestation ◽  
Salmon Louse ◽  
Potential Inhibitor

scholarly journals Differing susceptibility of anadromous brown trout (Salmo trutta L.) populations to salmon louse (Lepeophtheirus salmonis (Krøyer, 1837)) infection

2003 ◽  
Vol 60 (5) ◽  
pp. 1139-1148 ◽  
Author(s):  
K.A Glover ◽  
Ø Skaala ◽  
F Nilsen ◽  
R Olsen ◽  
A.J Teale ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Salmo Trutta ◽  
Common Garden ◽  
Lepeophtheirus Salmonis ◽  
Infection Level ◽  
Salmon Louse ◽  
Sea Trout ◽  
Salmon Lice ◽  
Brown Trout Salmo Trutta ◽  
Farmed Atlantic Salmon

Abstract Three Norwegian sea trout (Salmo trutta L.) stocks and a farmed Atlantic salmon (Salmo salar L.) stock were challenged with salmon lice (Lepeophtheirus salmonis (Krøyer, 1837)), in a “common garden” experiment. Sea trout from the River Guddal exhibited a significantly lower level of infection, as measured by louse abundance and louse density, than other stocks. In addition, salmon lice developed significantly more slowly on the Guddal stock than on the other stocks. Salmon louse abundance and density were similar for the Rivers Fortun and Sima stocks of sea trout, and abundance of lice, though not density, was highest for farmed Atlantic salmon. Within stocks, there were no differences in infection levels of salmon louse between mature and immature fish, between sexes, or between anal-fin-clipped and non-clipped salmon. Differences in infection level among the sea trout stocks may, it is suggested, reflect genetic differences.

scholarly journals Snorkel sea-cage technology decreases salmon louse infestation by 75% in a full-cycle commercial test

2019 ◽  
Vol 49 (11) ◽  
pp. 843-846 ◽  
Author(s):  
Lena Geitung ◽  
Frode Oppedal ◽  
Lars Helge Stien ◽  
Tim Dempster ◽  
Egil Karlsbakk ◽  
...  
Keyword(s):  
Louse Infestation ◽  
Salmon Louse ◽  
Commercial Test ◽  
Sea Cage

Present Status of the Salmonids Atlantic Salmon and Sea-Trout in the Dutch Part of the River Rhine

1994 ◽  
Vol 29 (3) ◽  
pp. 37-41 ◽  
Author(s):  
W. G. Cazemier
Keyword(s):  
Atlantic Salmon ◽  
Salmo Trutta ◽  
Natural Populations ◽  
River Rhine ◽  
Sea Trout ◽  
The Past ◽  
The North ◽  
Trout Population ◽  
The North Sea ◽  
Heavy Pollution

In the past, the anadromous salmonids, Atlantic salmon (Salmo salar) and sea-trout (Salmo trutta), have formed natural populations in the river Rhine. From the beginning of the nineteenth century onwards, the greater part of the drainage area of the river has been gradually altered from a more or less rural and agricultural area, into a highly industrialised one with subsequent industrialisation, river-engineering and heavy pollution. These developments are considered to be the major cause for the disappearance of the populations of anadromous salmonid fish in the 1950s. The water quality has recovered significantly during the past 25 years. From about 1975 onwards, this process gave rise to a recovery of the anadromous trout population. Results of recent studies of the sea-trout migration pattern are presented. They reveal that nowadays these salmonids can complete their up- and downstream migrations from the North Sea to places, situated at hundreds of kilometres upward the river and vica versa. The numbers of recorded Atlantic salmon and catch locations in inland waters are presented. They show a significant increase since 1989. These phenomena can be understood as promising signs of the recovery of the Rhine aquatic ecosystem.

Osprey with Spotted Sea Trout

Fisheries ◽  
2021 ◽  
Author(s):  
Mike Weimer
Keyword(s):  
Sea Trout
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