The use of a general linear model to identify epidemiological factors affecting the abundance of chalimus stages of the sea louse (Lepeophtheirus salmonis) on Scottish salmon farms

C.W. Revie, G. Gettinby, J.W. Treasurer, G. Ritchie

Research output: Chapter in Book/Report/Conference proceedingChapter

29 Downloads (Pure)

Abstract

In this communication chalimus lice numbers in the second, third and fourth quarters of the production cycle are examined in relation to a range of prevailing risk factors using an approach based on that already taken for mobile stages (Revie et al. in press). A total of 54 two-year production cycles from 29 farms on the West Coast of Scotland were analysed. Chalimus levels in the second six-month period of the first year of the production cycle were principally explained (adjusted R2 = 56% of the variation) by:the number of veterinary medicine treatments administered, the site hydrography and current speed characteristics. Sites with a high chalimus abundance attracted more treatments as did fish located in sites with low current speeds and an oscillatory hydrography. In contrast, chalimus levels in the third six-month period of the production cycle were principally explained (adjusted R2 = 65% of the variation) by: the abundance of mobile and chalimus stages in the preceding six-month period and treatment. It would appear that there are both management and environmental factors which affect the number of chalimus sea lice on fish in Scottish salmon farms and these have an impact on overall sea lice abundance.
Original languageEnglish
Title of host publicationProceedings of the 10th Symposium of the International Society for Veterinary Epidemiology and Economics
Number of pages4
Edition578
Publication statusPublished - 2003

Fingerprint

Lepeophtheirus salmonis
Caligidae
salmon
linear models
farms
lice
fish
hydrology
Scotland
animal communication
veterinary medicine
coasts

Keywords

  • wildlife
  • fish
  • aquatic epidemiology
  • databases

Cite this

Revie, C. W., Gettinby, G., Treasurer, J. W., & Ritchie, G. (2003). The use of a general linear model to identify epidemiological factors affecting the abundance of chalimus stages of the sea louse (Lepeophtheirus salmonis) on Scottish salmon farms. In Proceedings of the 10th Symposium of the International Society for Veterinary Epidemiology and Economics (578 ed.)
Revie, C.W. ; Gettinby, G. ; Treasurer, J.W. ; Ritchie, G. / The use of a general linear model to identify epidemiological factors affecting the abundance of chalimus stages of the sea louse (Lepeophtheirus salmonis) on Scottish salmon farms. Proceedings of the 10th Symposium of the International Society for Veterinary Epidemiology and Economics. 578. ed. 2003.
@inbook{6847d6a48a6242c68c62cfd9ac0e59f8,
title = "The use of a general linear model to identify epidemiological factors affecting the abundance of chalimus stages of the sea louse (Lepeophtheirus salmonis) on Scottish salmon farms",
abstract = "In this communication chalimus lice numbers in the second, third and fourth quarters of the production cycle are examined in relation to a range of prevailing risk factors using an approach based on that already taken for mobile stages (Revie et al. in press). A total of 54 two-year production cycles from 29 farms on the West Coast of Scotland were analysed. Chalimus levels in the second six-month period of the first year of the production cycle were principally explained (adjusted R2 = 56{\%} of the variation) by:the number of veterinary medicine treatments administered, the site hydrography and current speed characteristics. Sites with a high chalimus abundance attracted more treatments as did fish located in sites with low current speeds and an oscillatory hydrography. In contrast, chalimus levels in the third six-month period of the production cycle were principally explained (adjusted R2 = 65{\%} of the variation) by: the abundance of mobile and chalimus stages in the preceding six-month period and treatment. It would appear that there are both management and environmental factors which affect the number of chalimus sea lice on fish in Scottish salmon farms and these have an impact on overall sea lice abundance.",
keywords = "wildlife, fish, aquatic epidemiology, databases",
author = "C.W. Revie and G. Gettinby and J.W. Treasurer and G. Ritchie",
year = "2003",
language = "English",
booktitle = "Proceedings of the 10th Symposium of the International Society for Veterinary Epidemiology and Economics",
edition = "578",

}

Revie, CW, Gettinby, G, Treasurer, JW & Ritchie, G 2003, The use of a general linear model to identify epidemiological factors affecting the abundance of chalimus stages of the sea louse (Lepeophtheirus salmonis) on Scottish salmon farms. in Proceedings of the 10th Symposium of the International Society for Veterinary Epidemiology and Economics. 578 edn.

The use of a general linear model to identify epidemiological factors affecting the abundance of chalimus stages of the sea louse (Lepeophtheirus salmonis) on Scottish salmon farms. / Revie, C.W.; Gettinby, G.; Treasurer, J.W.; Ritchie, G.

Proceedings of the 10th Symposium of the International Society for Veterinary Epidemiology and Economics. 578. ed. 2003.

Research output: Chapter in Book/Report/Conference proceedingChapter

TY - CHAP

T1 - The use of a general linear model to identify epidemiological factors affecting the abundance of chalimus stages of the sea louse (Lepeophtheirus salmonis) on Scottish salmon farms

AU - Revie, C.W.

AU - Gettinby, G.

AU - Treasurer, J.W.

AU - Ritchie, G.

PY - 2003

Y1 - 2003

N2 - In this communication chalimus lice numbers in the second, third and fourth quarters of the production cycle are examined in relation to a range of prevailing risk factors using an approach based on that already taken for mobile stages (Revie et al. in press). A total of 54 two-year production cycles from 29 farms on the West Coast of Scotland were analysed. Chalimus levels in the second six-month period of the first year of the production cycle were principally explained (adjusted R2 = 56% of the variation) by:the number of veterinary medicine treatments administered, the site hydrography and current speed characteristics. Sites with a high chalimus abundance attracted more treatments as did fish located in sites with low current speeds and an oscillatory hydrography. In contrast, chalimus levels in the third six-month period of the production cycle were principally explained (adjusted R2 = 65% of the variation) by: the abundance of mobile and chalimus stages in the preceding six-month period and treatment. It would appear that there are both management and environmental factors which affect the number of chalimus sea lice on fish in Scottish salmon farms and these have an impact on overall sea lice abundance.

AB - In this communication chalimus lice numbers in the second, third and fourth quarters of the production cycle are examined in relation to a range of prevailing risk factors using an approach based on that already taken for mobile stages (Revie et al. in press). A total of 54 two-year production cycles from 29 farms on the West Coast of Scotland were analysed. Chalimus levels in the second six-month period of the first year of the production cycle were principally explained (adjusted R2 = 56% of the variation) by:the number of veterinary medicine treatments administered, the site hydrography and current speed characteristics. Sites with a high chalimus abundance attracted more treatments as did fish located in sites with low current speeds and an oscillatory hydrography. In contrast, chalimus levels in the third six-month period of the production cycle were principally explained (adjusted R2 = 65% of the variation) by: the abundance of mobile and chalimus stages in the preceding six-month period and treatment. It would appear that there are both management and environmental factors which affect the number of chalimus sea lice on fish in Scottish salmon farms and these have an impact on overall sea lice abundance.

KW - wildlife

KW - fish

KW - aquatic epidemiology

KW - databases

UR - http://www.isvee.org/

M3 - Chapter

BT - Proceedings of the 10th Symposium of the International Society for Veterinary Epidemiology and Economics

ER -

Revie CW, Gettinby G, Treasurer JW, Ritchie G. The use of a general linear model to identify epidemiological factors affecting the abundance of chalimus stages of the sea louse (Lepeophtheirus salmonis) on Scottish salmon farms. In Proceedings of the 10th Symposium of the International Society for Veterinary Epidemiology and Economics. 578 ed. 2003