Strathprints Home | Open Access | Browse | Search | User area | Copyright | Help | Library Home | SUPrimo

Temporal and spatial variations in lice numbers on salmon farms in the Hardanger fjord 2004-06

Heuch, P.A. and Olsen, R.S. and Malkenes, R. and Revie, C.W. and Gettinby, G. and Baillie, Mark and Lees, F. and Finstad, B. and , Fisheries and Aquaculture Industry Research Fund (Funder) and , Norwegian Research Council (Funder) (2009) Temporal and spatial variations in lice numbers on salmon farms in the Hardanger fjord 2004-06. Journal of Fish Diseases, 32 (1). pp. 89-100. ISSN 0140-7775

[img]
Preview
PDF (3._HeuchEtAl_JoFD_2009(a).pdf)
Download (1924Kb) | Preview

    Abstract

    The long and narrow Hardanger fjord in western Norway has a high density of salmon farms and has had severe salmon lice, Lepeophtheirus salmonis, problems. In the years 2004-06, salmon lice numbers were recorded in selected salmon farms in the fjord as part of a larger research project. Most farm sites participated in a strategic control programme and were deloused between November and January in each year. The aim of the programme was to achieve a mean abundance of <0.3 adult female lice at this time and to minimize the infection pressure on wild smolts in the spring. Dedicated teams carried out detailed counting of lice on farmed fish in April-September each year. Temperature conditions were fairly similar throughout the fjord and amongst years, but wide variations in salinities were observed. The two innermost zones, B and C, had the lowest lice mean abundances, whereas the outermost zones, D and E, consistently had more lice. General linear model analyses showed that differences in adult female lice abundance between the zones were associated with differing levels of salinity and emamectin benzoate treatments strategically administered. Mean fish weight was significantly positively correlated with mean abundance of adult female lice.

    Item type: Article
    ID code: 15278
    Keywords: abundance, epidemiology, Lepeophtheirus salmonis, Norway, Aquaculture. Fisheries. Angling, Electronic computers. Computer science, veterinary (miscalleneous), Aquatic Science
    Subjects: Agriculture > Aquaculture. Fisheries. Angling
    Science > Mathematics > Electronic computers. Computer science
    Department: Faculty of Science > Mathematics and Statistics
    Faculty of Science > Computer and Information Sciences
    Faculty of Science > Mathematics and Statistics > Statistics and Modelling Science
    Related URLs:
      Depositing user: Mrs Ann Lynch
      Date Deposited: 03 Feb 2010 14:07
      Last modified: 05 Sep 2014 13:30
      URI: http://strathprints.strath.ac.uk/id/eprint/15278

      Actions (login required)

      View Item

      Fulltext Downloads: