Effects of thermal and mechanical delousing on gill health of farmed Atlantic salmon (Salmo salar L.)

Østevik, Liv; Stormoen, Marit; Evensen, Øystein; Xu, Cheng; Lie, Kai-Inge; Nødtvedt, Ane; Rodger, H. D.; Skagøy, Andreas; Manji, Farah; Alarcón, Marta

doi:10.1016/j.aquaculture.2022.738019

Cited by 20 publications

(8 citation statements)

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“…Vascular lesions are unspecific responses and are not characteristic of a particular insult. An increase in prevalence and severity of thrombi, haemorrhage and/or aneurysms have been reported after non‐medicinal delousing and in situ net washing, and haemorrhage, thrombi and aneurysms have been observed after exposure to jellyfish (Baxter, Sturt, et al, 2011; Baxter, Rodger, McAllen, & Doyle, 2011; Bloecher et al, 2018; Marcos‐Lopez, Mitchell, & Rodger, 2016; Mitchell, Baxter, & Rodger, 2011; Østevik et al, 2021; Østevik et al, 2022; Powell, Atland, & Dale, 2018).…”

Section: Discussionmentioning

confidence: 99%

“…Gill samples from the fresh water and sea water were examined with RT‐qPCR for Candidatus Branchiomonas cysticola and salmon gill poxvirus, whereas samples from sea water, in addition, were analysed for Desmozoon lepeophtherii and Neoparamoeba perurans . Nucleic acid extraction and RT‐qPCR‐analysis were performed as reported previously (Østevik et al, 2022).…”

Section: Methodsmentioning

confidence: 99%

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A cohort study of gill infections, gill pathology and gill‐related mortality in sea‐farmed Atlantic salmon (Salmo salar L.): A descriptive analysis

Østevik

Stormoen

Hellberg

et al. 2022

Journal of Fish Diseases

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Gill disease is an important cause of economic losses, fish mortality and reduced animal welfare in the marine and freshwater phase of salmonid farming in Norway and across the world (Shinn et al., 2015;Sommerset, Bang Jensen, Bornø, Haukaas, & Brun, 2021). Reduced gill health may also impact outcomes of, and decisions about, management operations, such as non-medicinal delousing and transport, because diseased fish might have reduced tolerance for handling and stress. Gill disease and gill injuries can be caused by infectious agents, environmental factors, management operations or a combination of these (Boerlage et al., 2020;Rodger, Henry, & Mitchell, 2011). Gill disease has been classified as either simple or complex/multifactorial based on a presumption of single or multiple causes and/or infectious agents involved in the disease process (Gjessing,

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

A cohort study of gill infections, gill pathology and gill‐related mortality in sea‐farmed Atlantic salmon (Salmo salar L.): A descriptive analysis

Østevik

Stormoen

Hellberg

et al. 2022

Journal of Fish Diseases

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“…A more compelling explanation is that at the first treatment, there had been only two weeks since the fish had been moved from the stock tank into the smaller experimental tanks (⌀ = 7 m vs. 3 m) and underwent internal and external tagging. Moving fish, moving fish into smaller tanks and tagging are all known health risks, especially if the fish are not given sufficient time to recover ( Espmark et al., 2017 ; Vollset et al., 2020 ). It is likely that this, compromised the fish at the first treatment, while the zero mortality after the second treatment supports that they at this time had recovered from the tagging.…”

Section: Discussionmentioning

confidence: 99%

Warm water treatment increased mortality risk in salmon

Bui

Madaro

Nilsson

et al. 2022

Veterinary and Animal Science

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“…Direct high-tech combatting of lice on salmon by radiating the lice with laser beams was tested, but found less effective (Bui et al , 2020). Mechanical removal by freshwater flushing has been widely implemented in the industry (Østevik et al ., 2022) and may, despite its adverse effects on the host, lead to a reduction of the lice count. More intricate farm constructions have used the knowledge about host-finding behaviour by the infective salmon louse copepodids.…”

Section: Parasites In Aquaculturementioning

confidence: 99%

A century of parasitology in fisheries and aquaculture

Timi

Buchmann

2023

J. Helminthol.

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Fish parasitological research associated with fisheries and aquaculture has expanded remarkably over the past century. The application of parasites as biological tags has been one of the fields in which fish parasitology has generated new insight into fish migration and stock assessments worldwide. It is a well-established discipline whose methodological issues are regularly reviewed and updated. Therefore, no concepts or case-studies will be repeated here; instead, we summarize some of the main recent findings and achievements of this methodology. These include the extension of its use in hosts other than bony fishes; the improvements in the selection of parasite tags; the recognition of the host traits affecting the use of parasite tags; and the increasingly recognized need for integrative, multidisciplinary studies combining parasites with classical methods and modern techniques, such as otolith microchemistry and genetics. Archaeological evidence points to the existence of parasitic problems associated with aquaculture activities more than a thousand years ago. However, the main surge of research within aquaculture parasitology occurred with the impressive development of aquaculture over the past century. Protozoan and metazoan parasites, causing disease in domesticated fish in confined environments, have attracted the interest of parasitologists and, due to their economic importance, funding was made available for basic and applied research. This has resulted in a profusion of basic knowledge about parasite biology, physiology, parasite–host interactions, life cycles and biochemistry. Due to the need for effective control methods, various solutions targeting host–parasite interactions (immune responses and host finding), genetics and pharmacological aspects have been in focus.

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Effects of thermal and mechanical delousing on gill health of farmed Atlantic salmon (Salmo salar L.)

Cited by 20 publications

References 74 publications

A cohort study of gill infections, gill pathology and gill‐related mortality in sea‐farmed Atlantic salmon (Salmo salar L.): A descriptive analysis

A cohort study of gill infections, gill pathology and gill‐related mortality in sea‐farmed Atlantic salmon (Salmo salar L.): A descriptive analysis

Warm water treatment increased mortality risk in salmon

A century of parasitology in fisheries and aquaculture

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