Selection of host sample number and design of a monitoring programme for ectoparasitic sea lice (Copepoda: Caligidae) on farmed Atlantic salmon, Salmo salar

Treasurer, James W.; Pope, James A.

doi:10.1016/s0044-8486(00)00309-4

Cited by 36 publications

(33 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For greater precision, a sample size of 50 was attempted when possible. Sample sizes exceeded recommendations published later by Treasurer & Pope (2000) in which the purpose of sampling was for lice monitoring at the farm level, whereas this study attempted to detect a difference between treated and untreated cages.…”

Section: Methodsmentioning

confidence: 92%

Randomized clinical trial to investigate the effectiveness of teflubenzuron for treating sea lice on Atlantic salmon

Campbell¹,

Hammell²,

Dohoo³

et al. 2006

Dis. Aquat. Org.

View full text Add to dashboard Cite

A double-blind, randomized control clinical trial was performed to investigate the effectiveness of teflubenzuron in controlling sea lice Lepeophtheirus salmonis on farmed Atlantic salmon Salmo salar. A total of 40 sea cages from 3 commercial cage sites in Atlantic Canada were used in this Good Clinical Practice (GCP) trial. The teflubenzuron was administered in the feed at a dosage of 10 mg kg -1 biomass d -1 for 7 d. Medicated and control cages were matched by site, cage size, and pre-treatment mean lice counts using cages as the unit of concern. Post-treatment lice counts and staging of developmental stages were performed at 1 and 2 wk after the end of treatment. Chalimus stages in medicated cages were significantly lower than in control cages at 1 wk (79% reduction in mean lice counts, p < 0.001), and at 2 wk (53% reduction, p < 0.001). Mobile (pre-adult and adult) stages were also significantly reduced in medicated cages at 1 wk (69% reduction, p < 0.01), and at 2 wk (40% reduction, p < 0.01) post-treatment, respectively. Teflubenzuron was proven effective for reducing lice burdens on salmon despite the low parasite levels experienced during the trial and the recruitment of lice from the untreated cages. The use of cage as the unit of concern was an important design component of this trial.

show abstract

Section: Methodsmentioning

confidence: 92%

Randomized clinical trial to investigate the effectiveness of teflubenzuron for treating sea lice on Atlantic salmon

Campbell¹,

Hammell²,

Dohoo³

et al. 2006

Dis. Aquat. Org.

View full text Add to dashboard Cite

show abstract

“…Each farm company has its own protocol for monitoring L. salmonis, although they all follow a similar sampling design (Anonymous 2006). L. salmonis counts are conducted approximately weekly; the pens and fish sampled should be selected at random, and a total of approximately 25 fish should be examined (Treasurer & Pope 2000). The sampling protocol for monitoring L. salmonis at Farm 1 was not made available despite having been requested.…”

Section: Methodsmentioning

confidence: 99%

Reduced Lepeophtheirus salmonis larval abundance in a sea loch on the west coast of Scotland between 2002 and 2006

Penston¹,

Millar²,

Davies³

2008

Dis. Aquat. Org.

View full text Add to dashboard Cite

A survey for planktonic sea louse larvae was carried out in Loch Shieldaig, Scotland, between 2002 and2006, and spanned 2 successive production cycles (Cycles 1 and 2) at a local Atlantic salmon Salmo salar L. farm. The vast majority of the caligid copepodids recovered were Lepeophtheirus salmonis; however, the methodology was unable to determine the species of the caligid nauplii. Greatest densities of nauplii were found at the sampling station adjacent to the salmon farm, and larval densities were low during the fallow period of both cycles. Peaks in nauplius densities occurred around the same time in the 2 cycles, but the peaks were significantly lower during Cycle 2 than Cycle 1. Lepeophtheirus salmonis copepodid densities varied temporally, but not spatially. During most of Cycle 2, copepodid densities were significantly lower than those recovered during Cycle 1. Numbers of gravid L. salmonis at the local salmon farm correlated significantly with densities of louse nauplii and L. salmonis copepodids in the water at time lags of 0 and 1 wk, and 1 and 2 wk, respectively. This survey demonstrated a reduction in densities of L. salmonis larvae in the plankton (an indication of L. salmonis infectious pressure) between the 2 cycles and indicated that the farm was an important source of L. salmonis larvae. The application of anti-louse treatments using emamectin benzoate reduced the numbers of gravid L. salmonis at the farm, and this was the main factor influencing the apparent reduction in L. salmonis infectious pressure in the loch between cycles. KEY WORDS: Lepeophtheirus salmonis · Sea lice · Larvae · Salmon farm · Scotland Resale or republication not permitted without written consent of the publisherDis Aquat Org 81: [109][110][111][112][113][114][115][116][117] 2008 duration of each stage of development is strongly dependent on temperature (Johnson & Albright 1991a). Under average sea surface temperatures in Loch Torridon (around 10°C), L. salmonis nauplii and copepodids would last approximately 3 and 8 d, respectively (Johnson & Albright 1991a), but may become less capable of finding a host after just a few days as finite energy reserves dwindle (Tucker et al. 2000).Few published accounts have described the behaviour of Lepeophtheirus salmonis larvae in the wild. Costelloe et al. (1998a,b) frequently recovered L. salmonis larvae near salmon farms in Ireland. They suggested that most of these larvae were probably of farm origin and that intermittent pulses of L. salmonis larvae that occurred near river mouths were probably of wild origin. A study in Loch Shieldaig, Scotland (Penston et al. 2008), suggested that the majority of louse larvae recovered near a salmon farm were the progeny of L. salmonis on farmed salmon. In contrast to Costelloe et al. (1998a,b), who concluded that farms only influence L. salmonis populations in their immediate environs, Penston et al. (2008) suggested that L. salmonis larvae can have a widespread effect in the surrounding waters.As with most salmon farms in Scotl...

show abstract

“…The requirement for continual monitoring and control of sea lice is a costly economic burden for Atlantic salmon Salmo salar producers throughout North America and northern Europe (Costello 1993, Treasurer & Pope 2000. Although there are a number of biological and chemical means of sea lice management and control, reduced sensitivity and resistance development of sea lice towards several chemotherapeutants have been reported (Jones et al 1992, Tully & McFadden 2000, Sevatdal & Horsberg 2003, Fallang et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Optimization and field use of a bioassay to monitor sea lice Lepeophtheirus salmonis sensitivity to emamectin benzoate

Westcott¹,

Stryhn²,

Burka³

et al. 2008

Dis. Aquat. Org.

View full text Add to dashboard Cite

Selection of host sample number and design of a monitoring programme for ectoparasitic sea lice (Copepoda: Caligidae) on farmed Atlantic salmon, Salmo salar

Cited by 36 publications

References 10 publications

Randomized clinical trial to investigate the effectiveness of teflubenzuron for treating sea lice on Atlantic salmon

Randomized clinical trial to investigate the effectiveness of teflubenzuron for treating sea lice on Atlantic salmon

Reduced Lepeophtheirus salmonis larval abundance in a sea loch on the west coast of Scotland between 2002 and 2006

Optimization and field use of a bioassay to monitor sea lice Lepeophtheirus salmonis sensitivity to emamectin benzoate

Contact Info

Product

Resources

About