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Diseases of Aquatic Organisms

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DAO 123:181-192 (2017)  -  DOI:

Factors influencing the long-term dynamics of larval sea lice density at east and west coast locations in Scotland

Anna J. Harte1,2, Alan S. Bowman1, Nabeil K. G. Salama2, Campbell C. Pert2,*

1Institute of Biological and Environmental Sciences, School of Biological Sciences, University of Aberdeen, Tillydrone Avenue, Aberdeen AB24 2TZ, UK
2Marine Scotland Science, Marine Laboratory Aberdeen, 375 Victoria Road, Aberdeen AB11 9DB, UK
*Corresponding author:

ABSTRACT: Sea lice (Copepoda: Caligidae) are marine copepods that parasitize finfish, and in cases of high infestation can result in severe epithelial damage and mortality. In Scotland, 2 species of sea louse, Lepeophtheirus salmonis and Caligus elongatus, pose a significant economic burden to the marine Atlantic salmon aquaculture industry and potentially impact wild salmonids. The purpose of this study was to determine how the density of pelagic sea lice is affected by external variables, in order to improve our understanding of sea lice dynamics. Long-term data from 2 sampling sites on the east and west coasts of Scotland were modelled independently in conjunction with environmental and anthropogenic variables. Statistical analysis identified that at the east coast site, the most influential factor affecting lice density was salinity. On the west coast, salinity, rainfall and farmed salmon production year were most influential. Molecular and morphological techniques also showed that the individuals recorded on the east coast were C. elongatus, a generalist copepod parasite, whereas only the salmonid-specific L. salmonis were found on the west. These results reiterate the role of environmental factors in influencing sea lice dynamics, and that salmonids are the primary hosts of sea lice on the west coast, but there could be non-salmonid host species as well as salmonid species influencing east coast sea lice densities.

KEY WORDS: Caligidae · Scotland · Environmental parameters · Caligus elongatus · Lepeophtheirus salmonis

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Cite this article as: Harte AJ, Bowman AS, Salama NKG, Pert CC (2017) Factors influencing the long-term dynamics of larval sea lice density at east and west coast locations in Scotland. Dis Aquat Org 123:181-192.

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