scholarly journals Parasite management in aquaculture exerts selection on salmon louse behaviour

2021 ◽  
Author(s):  
Andrew Coates ◽  
Ingrid A Johnsen ◽  
Tim Dempster ◽  
Ben L Phillips
Keyword(s):  
Salmon Louse

scholarly journals The salmon louse genome: Copepod features and parasitic adaptations

Genomics ◽  
2021 ◽  
Author(s):  
Rasmus Skern-Mauritzen ◽  
Ketil Malde ◽  
Christiane Eichner ◽  
Michael Dondrup ◽  
Tomasz Furmanek ◽  
...  
Keyword(s):  
Salmon Louse

Diel vertical distribution of early marine phase juvenile pink salmon (Oncorhynchus gorbuscha) and behaviour when exposed to salmon louse (Lepeophtheirus salmonis)

2011 ◽  
Vol 89 (9) ◽  
pp. 796-807 ◽  
Author(s):  
S. Tang ◽  
A.G. Lewis ◽  
M. Sackville ◽  
L. Nendick ◽  
C. DiBacco ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
Water Column ◽  
Pink Salmon ◽  
Distribution Patterns ◽  
Oncorhynchus Gorbuscha ◽  
Lepeophtheirus Salmonis ◽  
Night Time ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Salmon Louse ◽  
Seawater Acclimation

We observed diel vertical migration patterns in juvenile pink salmon ( Oncorhynchus gorbuscha (Walbaum, 1792)) and tested the hypothesis that fish behaviour is altered by exposure to sea lice copepodids. Experiments involved replicated field deployments of a large (9 m) plankton column, which provided a vertical distribution enclosure under natural light and salinity conditions. Diel vertical distributions of juvenile pink salmon were observed during the first 3 weeks of seawater acclimation in both the presence and the absence of the ectoparasitic salmon louse ( Lepeophtheirus salmonis (Krøyer, 1838)). Immediately upon entering seawater, juvenile pink salmon preferred the top 1 m of the water column, but they moved significantly deeper down the vertical water column as seawater acclimation time increased. A significant diel migration pattern was observed, which involved a preference for the surface at night-time, compared with daytime. When fish in the column were exposed to L. salmonis copepodids for 3 h, 43%–62% of fish became infected, fish expanded their vertical distribution range, and significant changes in vertical distribution patterns were observed.

Prohibitin-2 gene reveals sex-related differences in the salmon louse Caligus rogercresseyi

Gene ◽  
2015 ◽  
Vol 564 (1) ◽  
pp. 73-80 ◽  
Author(s):  
Rodolfo Farlora ◽  
Gustavo Nuñez-Acuña ◽  
Cristian Gallardo-Escárate
Keyword(s):  
Salmon Louse

scholarly journals Rainbow trout Oncorhynchus mykiss skin responses to salmon louse Lepeophtheirus salmonis: From copepodid to adult stage

2020 ◽  
Vol 103 ◽  
pp. 200-210 ◽  
Author(s):  
Sussie Dalvin ◽  
Louise v.G. Jørgensen ◽  
Per W. Kania ◽  
Sindre Grotmol ◽  
Kurt Buchmann ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Adult Stage ◽  
Lepeophtheirus Salmonis ◽  
Salmon Louse ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Skin Responses

scholarly journals Aquaculture-driven evolution: distribution of pyrethroid resistance in the salmon louse throughout the North Atlantic in the years 2000–2017

2020 ◽  
Vol 77 (5) ◽  
pp. 1806-1815 ◽  
Author(s):  
Helene Børretzen Fjørtoft ◽  
Frank Nilsen ◽  
Francois Besnier ◽  
Per Gunnar Espedal ◽  
Anne Stene ◽  
...  
Keyword(s):  
North Atlantic ◽  
Pyrethroid Resistance ◽  
Fish Farms ◽  
Low Frequencies ◽  
Salmon Louse ◽  
The North ◽  
The North Atlantic ◽  
Intensive Aquaculture ◽  
Very High Frequencies ◽  
Year 2000

Abstract The parasitic salmon louse, and its documented resistance to chemotherapeutants, represents the most persistent environmental challenge to global salmonid aquaculture. We used a genetic marker associated with pyrethroid resistance to analyse ∼15 000 lice collected from the North Atlantic in the period 2000–2017. The genotype associated with resistance was not detected in lice collected from throughout the North Atlantic in the year 2000 or 2002. However, by the year 2009 onwards, it was found in lice from fish farms throughout much of the North Atlantic. It was also found in modest frequencies in lice collected from wild Atlantic salmon captured off Greenland. The most recent samples displayed very high frequencies of the genotype associated with resistance, particularly in intensive aquaculture regions of Norway (>90%) and Scotland (>70%). These results closely align with observations from the field. We suggest that pyrethroid resistance first emerged in Europe just before or around the year 2000 and was thereafter dispersed throughout much of the North Atlantic where its increased frequency was driven by extensive pyrethroid use. Although the resistant genotype was not detected in lice from Canada, it is likely to occur in very low frequencies that would quickly increase if pyrethroids were to be used in that region.

scholarly journals Ultrastructure of the cuticle of the chalimus larva of the salmon louse Lepeophtheirus salmonis (Krøyer, 1837) (Copepoda: Caligidae)

2000 ◽  
Vol 69 (1-2) ◽  
pp. 39-49 ◽  
Author(s):  
J.E. Bron ◽  
A.P. Shinn ◽  
C. Sommerville
Keyword(s):  
Lepeophtheirus Salmonis ◽  
Free Living ◽  
Salmon Louse ◽  
Parasitic Species

The cuticle of the chalimus II stage of Lepeophtheirus salmonis (Copepoda: Caligidae) comprised a four-layered epicuticle with a pronounced fuzzy coat which was separated from the outer and inner procuticles by a layer of transitional procuticle. The cuticle is underlain by a single-layered epidermis which overlies integumental glands and chromatophores. The structure of this cuticle is very similar to that described for free-living copepods and does not display the modifications associated with more highly transformed parasitic species.

Sign in / Sign up

Export Citation Format

Share Document