AEI 5:49-59 (2014)  -  DOI:

Using sentinel cages to estimate infestation pressure on salmonids from sea lice in Loch Shieldaig, Scotland

Campbell C. Pert1,*, Rob J. Fryer1, Paul Cook1, Rachel Kilburn1, Sonia McBeath1, Alastair McBeath1, Iveta Matejusova1, Katy Urquhart1, Sarah J. Weir1, Una McCarthy1, Catherine Collins1, Trish Amundrud1, Ian R. Bricknell1,2

1Marine Scotland Science, Marine Laboratory, PO Box 101, 375 Victoria Road, Aberdeen, Scotland AB11 9DB, UK
2School of Marine Sciences, University of Maine, 5735 Hitchner Hall, Orono, Maine 04469-5735, USA
*Corresponding author:

ABSTRACT: Sentinel Atlantic salmon, held in cages, were used to estimate the monthly infestation pressure of sea lice at 3 locations along a salmonid migration route in Loch Shieldaig, a Scottish west coast sea loch. The study lasted 30 mo, covering an entire production cycle and fallow period at nearby fish farms. A total of 5007 sea lice were sampled from 3097 sentinel fish, with over 99% of these being Lepeophtheirus salmonis. Infestation pressure was higher in cages nearer the head of the loch and the River Shieldaig estuary. Copepodids were the main infective life cycle stage, but a few (0.5% of total lice sampled) mobile pre-adult and adult stages were also found on the sentinel fish. Infestation pressure on the sentinel fish was correlated with gravid L. salmonis counts from nearby farms. However, there was no evidence that particular events, such as treatments, at the farms led directly to changes in infestation pressure. These findings suggest that, although aquaculture is a contributor of sea lice larvae into the Torridon system, further work is required to determine factors influencing the relationship between farm sea lice levels and infestation pressure in the wider environment.

KEY WORDS: Lepeophtheirus salmonis · Sea lice · Infestation pressure · Sentinel cages · Aquaculture · Sea loch · Infectious copepodid

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Cite this article as: Pert CC, Fryer RJ, Cook P, Kilburn R and others (2014) Using sentinel cages to estimate infestation pressure on salmonids from sea lice in Loch Shieldaig, Scotland. Aquacult Environ Interact 5:49-59.

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