<i>Lepeophtheirus salmonis</i>on Salmonids in the Northeast Pacific Ocean

Jones, Simon R. M.; Beamish, Richard

doi:10.1002/9780470961568.ch10

Cited by 3 publications

(2 citation statements)

References 42 publications

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“…). Since 2007, coordinated treatment with emamectin benzoate applied to farmed salmon 1 or 2 months prior to the migration of juvenile pink and chum salmon into the ocean in the Broughton Archipelago has coincided with a significant and persistent decline in L. salmonis abundance on the wild salmon (Jones & Hargreaves ; Jones & Beamish ). Furthermore, in British Columbia, there is no evidence that the efficacy of emamectin benzoate against L. salmonis has changed between 2003 and 2008 (Saksida, Morrison & Revie ).…”

Section: Salmon Louse Population Dynamicsmentioning

confidence: 99%

Salmon lice – impact on wild salmonids and salmon aquaculture

Torrissen

Jones

Asche

et al. 2013

Journal of Fish Diseases

401

313

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Salmon lice, Lepeophtheirus salmonis, are naturally occurring parasites of salmon in sea water. Intensive salmon farming provides better conditions for parasite growth and transmission compared with natural conditions, creating problems for both the salmon farming industry and, under certain conditions, wild salmonids. Salmon lice originating from farms negatively impact wild stocks of salmonids, although the extent of the impact is a matter of debate. Estimates from Ireland and Norway indicate an odds ratio of 1.1:1-1.2:1 for sea lice treated Atlantic salmon smolt to survive sea migration compared to untreated smolts. This is considered to have a moderate population regulatory effect. The development of resistance against drugs most commonly used to treat salmon lice is a serious concern for both wild and farmed fish. Several large initiatives have been taken to encourage the development of new strategies, such as vaccines and novel drugs, for the treatment or removal of salmon lice from farmed fish. The newly sequenced salmon louse genome will be an important tool in this work. The use of cleaner fish has emerged as a robust method for controlling salmon lice, and aquaculture production of wrasse is important towards this aim. Salmon lice have large economic consequences for the salmon industry, both as direct costs for the prevention and treatment, but also indirectly through negative public opinion.

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Section: Salmon Louse Population Dynamicsmentioning

confidence: 99%

Salmon lice – impact on wild salmonids and salmon aquaculture

Torrissen

Jones

Asche

et al. 2013

Journal of Fish Diseases

401

313

View full text Add to dashboard Cite

show abstract

“…Salmon lice display a high reproductive output, releasing large numbers of planktonic larvae into the surrounding water masses that are thereafter spread via the marine currents. These infect farmed salmonids reared in cages (Torrissen et al, 2013), wild Atlantic salmon postsmolts migrating to offshore areas, as well as wild sea trout (Salmo trutta) and Arctic charr (Salvelinus alpinus) that stay in coastal waters (Finstad & Bjørn, 2011;Heuch & Mo, 2001;Heuch et al, 2005;Jones & Beamish, 2011). High levels of infection in both farmed and wild hosts can inflict extensive physiological problems, and ultimately death (Wagner, Fast, & Johnson, 2008).…”

Section: Introductionmentioning

confidence: 99%

A pedigree‐based experiment reveals variation in salinity and thermal tolerance in the salmon louse, Lepeophtheirus salmonis

Ljungfeldt

Quintela

Besnier

et al. 2017

Evolutionary Applications

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The salmon louse is a highly abundant ectoparasitic copepod of salmonids in the North Pacific and Atlantic. Widespread and rapid development of resistance to chemical agents used to delouse salmonids on marine farms is now threatening the continued development of the aquaculture industry and have served as a potent catalyst for the development of alternative pest management strategies. These include freshwater and warm‐water treatments to which the louse is sensitive. However, given the well‐documented evolutionary capacity of this species, the risk of developing tolerance towards these environmental treatments cannot be dismissed. Two common‐garden experiments were performed using full‐sibling families of lice identified by DNA parentage testing to investigate whether one of the fundamental premises for evolution, in this context genetic variation in the capacity of coping with fresh or warm water, exists within this species. Significant differences in survival were observed among families in both experiments, although for the salinity experiment, it was not possible to unequivocally disentangle background mortality from treatment‐induced mortality. Thus, our data demonstrate genetic variation in tolerance of warm water and are suggestive of genetic variation in salinity tolerance. We conclude that extensive use of these environmental‐based treatments to delouse salmonids on commercial farms may drive lice towards increased tolerance.

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Environmental Performance of Marine Net‐Pen Aquaculture in the United States

et al. 2014

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The United States has a small net‐pen salmon industry dating back over 40 years and a nascent net‐pen industry for other marine fish. The United States net‐pen aquaculture sector has improved its resource efficiency in terms of the amount of fish meal and fish oil used in feeds and reduced its environmental impacts in terms of the mass loading and impact of nutrient discharge on the receiving ecosystem, the incidence and treatment of fish diseases, the use of antibiotics, and the number and impact of fish escapes, while increasing production. These changes can be attributed to a combination of advances in science and technology, rising cost of fish meal/oil, improved management, and informed regulatory practices. Net‐pen aquaculture has become an efficient food production system. Existing laws and regulations in the United States effectively address most of the potential adverse environmental effects of net‐pen aquaculture.

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Lepeophtheirus salmonison Salmonids in the Northeast Pacific Ocean

Cited by 3 publications

References 42 publications

Salmon lice – impact on wild salmonids and salmon aquaculture

Salmon lice – impact on wild salmonids and salmon aquaculture

A pedigree‐based experiment reveals variation in salinity and thermal tolerance in the salmon louse, Lepeophtheirus salmonis

Environmental Performance of Marine Net‐Pen Aquaculture in the United States

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