An evaluation of the impact of early infestation with the salmon louse Lepeophtheirus salmonis on the subsequent survival of outwardly migrating Atlantic salmon, Salmo salar L., smolts

Jackson, David W.; Cotter, D.; O’Maoiléidigh, N.; O'Donohoe, P.; White, Jonathan; Kane, Frank; Kelly, S.; McDermott, Tom; McEvoy, S.; Drumm, A.; Cullen, A.; Rogan, Ger

doi:10.1016/j.aquaculture.2011.03.029

Cited by 21 publications

(42 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such studies require accurate information about return rates of smolt cohorts, and preferably also about regional infection levels. In Atlantic salmon, comparisons of return rates of smolt groups protected against salmon lice by various chemicals with untreated controls have shown that treated groups often have higher survival rates, suggesting a population-regulating effect of salmon lice (Skilbrei & Wennevik 2006;Jackson et al 2011;Gargan et al 2012). For anadromous brown trout, however, this is less well documented.…”

Section: Introductionmentioning

confidence: 95%

Evidence of salmon lice-induced mortality of anadromous brown trout (Salmo trutta) in the Hardangerfjord, Norway

Skaala

Kålås²,

Borgstrøm

2013

Marine Biology Research

View full text Add to dashboard Cite

The Hardangerfjord, western Norway, is an area with a high concentration of salmon farms, high levels of infection of salmon lice in anadromous brown trout, and declining trout populations. This study assessed the marine survival rate of anadromous trout from the River Guddalselva, in the central part of the fjord, and tested the hypothesis that trout populations in this area are depressed by salmon lice infection. From 2001 to 2011, all descending smolts and trout returning from the fjord were captured in the traps at the field station of the Institute of Marine Research. In 2004 and 2005, parts of the smolt cohorts were treated with the Substance EX to prevent sea lice infection. From 2007 to 2010, all smolts (n 03557) were also tagged with individual tags. The results show a survival rate in the sea of only 0.58Á3.41% for tagged smolts, which is extremely low. The highest survival rates appeared in the years with the lowest recordings of salmon lice in spring. The survival rate of Substance EX-treated smolts and controls was 3.41% and 1.76%, respectively. These findings suggest that salmon lice infection is an important contributor to the high mortality of anadromous trout populations in the Hardangerfjord.

show abstract

Section: Introductionmentioning

confidence: 95%

Evidence of salmon lice-induced mortality of anadromous brown trout (Salmo trutta) in the Hardangerfjord, Norway

Skaala

Kålås²,

Borgstrøm

2013

Marine Biology Research

View full text Add to dashboard Cite

show abstract

“…The study, based at the Marine Institute research facility in Burrishoole, Newport, County Mayo, has been running for ten years. Results, recently presented (Jackson et al, 2011) show that in the Burrishoole ranched stock over the study period, infestation of outwardly migrating salmon smolts with the salmon louse (L. salmonis) is not a major contributory factor to marine mortality. In order to investigate if these findings held true at other locations and for other stocks a series of five experimental releases at four locations were undertaken, two in 2001 and three in 2006.…”

Section: Introductionmentioning

confidence: 99%

“…Significant declines in marine survival of Atlantic salmon have been recorded in Ireland (Salmon Management Task Force Report (Anon., 1996); Ó Maoilédigh et al, 2004;Jackson et al, 2011). The reasons for the reduced marine survival remains unclear and speculation has ranged from global warming effects (Friedland et al, 2005) to habitat changes and sea lice infestation (Finstad et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Impact of early infestation with the salmon louse Lepeophtheirus salmonis on the subsequent survival of outwardly migrating Atlantic salmon smolts from a number of rivers on Ireland's south and west coasts

Jackson

Cotter²,

O’Maoiléidigh³

et al. 2011

Aquaculture

Self Cite

View full text Add to dashboard Cite

The potential impact of sea lice infestation on outwardly migrating Atlantic salmon smolts has been investigated by treating populations of ranched salmon, prior to release, with a prophylactic sea lice treatment conferring protection from sea lice infestation, for up to 9 weeks. Established populations of ranched Atlantic salmon with well described rates of return were chosen to investigate the potential contribution of early infestation with the salmon louse, Lepeophtheirus salmonis to mortality in Atlantic salmon. Results of five releases from four locations are presented and compared with a time series of releases from the Lough Furnace in Newport, County Mayo. The results of this study would suggest that infestation of outwardly migrating salmon smolts with the salmon louse (L. salmonis) was a minor component of the overall marine mortality in the stocks studied.

show abstract

“…Remarkably, a comparison with non-treated fish revealed that protection of juveniles from salmon louse infection represented a minor component to overall marine survival. Indeed, during the 10-year study, adult Atlantic salmon returns fell a similar 10-fold in both treated and non-treated fish [71]. A similar study on juvenile pink salmon treated with SLICE in the Broughton Archipelago could be very revealing in assessing the true impact of sea lice on pink salmon fitness.…”

Section: Recommendations: a Conservative No-effect Body Mass Thresholdmentioning

confidence: 83%

Physiological consequences of the salmon louse (Lepeophtheirus salmonis) on juvenile pink salmon (Oncorhynchus gorbuscha): implications for wild salmon ecology and management, and for salmon aquaculture

Brauner

Sackville

Gallagher

et al. 2012

Phil. Trans. R. Soc. B

View full text Add to dashboard Cite

Pink salmon, Oncorhynchus gorbuscha, are the most abundant wild salmon species and are thought of as an indicator of ecosystem health. The salmon louse, Lepeophtheirus salmonis, is endemic to pink salmon habitat but these ectoparasites have been implicated in reducing local pink salmon populations in the Broughton Archipelago, British Columbia. This allegation arose largely because juvenile pink salmon migrate past commercial open net salmon farms, which are known to incubate the salmon louse. Juvenile pink salmon are thought to be especially sensitive to this ectoparasite because they enter the sea at such a small size (approx. 0.2 g). Here, we describe how 'no effect' thresholds for salmon louse sublethal impacts on juvenile pink salmon were determined using physiological principles. These data were accepted by environmental managers and are being used to minimize the impact of salmon aquaculture on wild pink salmon populations.

show abstract

An evaluation of the impact of early infestation with the salmon louse Lepeophtheirus salmonis on the subsequent survival of outwardly migrating Atlantic salmon, Salmo salar L., smolts

Cited by 21 publications

References 15 publications

Evidence of salmon lice-induced mortality of anadromous brown trout (Salmo trutta) in the Hardangerfjord, Norway

Evidence of salmon lice-induced mortality of anadromous brown trout (Salmo trutta) in the Hardangerfjord, Norway

Impact of early infestation with the salmon louse Lepeophtheirus salmonis on the subsequent survival of outwardly migrating Atlantic salmon smolts from a number of rivers on Ireland's south and west coasts

Physiological consequences of the salmon louse (Lepeophtheirus salmonis) on juvenile pink salmon (Oncorhynchus gorbuscha): implications for wild salmon ecology and management, and for salmon aquaculture

Contact Info

Product

Resources

About