Planktonic and Parasitic Sea Lice Abundance on Three Commercial Salmon Farms in Norway Throughout a Production Cycle
The present article reports the densities of planktonic sea lice (Lepeophtheirus salmonis and Caligus elongatus) in three Atlantic salmon (Salmo salar) localities, and the relationship between the abundance of adult sea lice on the salmon and the densities of planktonic sea lice stages, during a com...
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ftdoajarticles:oai:doaj.org/article:29f0c48df22e4075b94b6035afb6abf1 2023-05-15T15:32:49+02:00 Planktonic and Parasitic Sea Lice Abundance on Three Commercial Salmon Farms in Norway Throughout a Production Cycle Lone S. Jevne Maria Guttu Anna S. Båtnes Yngvar Olsen Kjell I. Reitan 2021-01-01T00:00:00Z https://doi.org/10.3389/fmars.2021.615567 https://doaj.org/article/29f0c48df22e4075b94b6035afb6abf1 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2021.615567/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2021.615567 https://doaj.org/article/29f0c48df22e4075b94b6035afb6abf1 Frontiers in Marine Science, Vol 8 (2021) sea lice (Caligidae) Lepeophtheirus salmonis Caligus elongatus lice skirt sea cage aquaculture salmon lice dispersion Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2021 ftdoajarticles https://doi.org/10.3389/fmars.2021.615567 2022-12-31T09:05:02Z The present article reports the densities of planktonic sea lice (Lepeophtheirus salmonis and Caligus elongatus) in three Atlantic salmon (Salmo salar) localities, and the relationship between the abundance of adult sea lice on the salmon and the densities of planktonic sea lice stages, during a complete production cycle followed by a fallowing period. Samples were taken downstream inside and immediately outside of cages, at one locality with lice skirts and two localities without lice skirts. There were no differences in densities of planktonic sea lice in samples taken from the inside or the outside of cages for any of the localities. However, the proportion-non-zero of planktonic sea lice samples taken from inside the cage was higher during months with a temperature above 9°C (mean abundance: 0.40–2.5 individuals m–3) than months with temperature below 9°C (mean abundance: 0.02–0.21 individuals m–3, odds ratio of the proportion-non-zero: p < 0.01). Densities of planktonic sea lice correlated most strongly with temperature in the first year (τ = 0.44–0.57, p < 0.05). A significant correlation between the number of adult female lice on salmon and average density of plankton sea lice was found in the locality with lice skirts during the second year (τ = 0.43 inside cages, τ = 0.58 outside cages, both p values < 0.05). Background levels of planktonic sea lice in the succeeding fallowing period showed neither L. salmonis nor C. elongatus planktonic sea lice, suggesting that there was successful reduction of the densities of planktonic sea lice for this area during the fallowing period. Article in Journal/Newspaper Atlantic salmon Salmo salar Directory of Open Access Journals: DOAJ Articles Norway Frontiers in Marine Science 8 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
sea lice (Caligidae) Lepeophtheirus salmonis Caligus elongatus lice skirt sea cage aquaculture salmon lice dispersion Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
sea lice (Caligidae) Lepeophtheirus salmonis Caligus elongatus lice skirt sea cage aquaculture salmon lice dispersion Science Q General. Including nature conservation geographical distribution QH1-199.5 Lone S. Jevne Maria Guttu Anna S. Båtnes Yngvar Olsen Kjell I. Reitan Planktonic and Parasitic Sea Lice Abundance on Three Commercial Salmon Farms in Norway Throughout a Production Cycle |
topic_facet |
sea lice (Caligidae) Lepeophtheirus salmonis Caligus elongatus lice skirt sea cage aquaculture salmon lice dispersion Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
The present article reports the densities of planktonic sea lice (Lepeophtheirus salmonis and Caligus elongatus) in three Atlantic salmon (Salmo salar) localities, and the relationship between the abundance of adult sea lice on the salmon and the densities of planktonic sea lice stages, during a complete production cycle followed by a fallowing period. Samples were taken downstream inside and immediately outside of cages, at one locality with lice skirts and two localities without lice skirts. There were no differences in densities of planktonic sea lice in samples taken from the inside or the outside of cages for any of the localities. However, the proportion-non-zero of planktonic sea lice samples taken from inside the cage was higher during months with a temperature above 9°C (mean abundance: 0.40–2.5 individuals m–3) than months with temperature below 9°C (mean abundance: 0.02–0.21 individuals m–3, odds ratio of the proportion-non-zero: p < 0.01). Densities of planktonic sea lice correlated most strongly with temperature in the first year (τ = 0.44–0.57, p < 0.05). A significant correlation between the number of adult female lice on salmon and average density of plankton sea lice was found in the locality with lice skirts during the second year (τ = 0.43 inside cages, τ = 0.58 outside cages, both p values < 0.05). Background levels of planktonic sea lice in the succeeding fallowing period showed neither L. salmonis nor C. elongatus planktonic sea lice, suggesting that there was successful reduction of the densities of planktonic sea lice for this area during the fallowing period. |
format |
Article in Journal/Newspaper |
author |
Lone S. Jevne Maria Guttu Anna S. Båtnes Yngvar Olsen Kjell I. Reitan |
author_facet |
Lone S. Jevne Maria Guttu Anna S. Båtnes Yngvar Olsen Kjell I. Reitan |
author_sort |
Lone S. Jevne |
title |
Planktonic and Parasitic Sea Lice Abundance on Three Commercial Salmon Farms in Norway Throughout a Production Cycle |
title_short |
Planktonic and Parasitic Sea Lice Abundance on Three Commercial Salmon Farms in Norway Throughout a Production Cycle |
title_full |
Planktonic and Parasitic Sea Lice Abundance on Three Commercial Salmon Farms in Norway Throughout a Production Cycle |
title_fullStr |
Planktonic and Parasitic Sea Lice Abundance on Three Commercial Salmon Farms in Norway Throughout a Production Cycle |
title_full_unstemmed |
Planktonic and Parasitic Sea Lice Abundance on Three Commercial Salmon Farms in Norway Throughout a Production Cycle |
title_sort |
planktonic and parasitic sea lice abundance on three commercial salmon farms in norway throughout a production cycle |
publisher |
Frontiers Media S.A. |
publishDate |
2021 |
url |
https://doi.org/10.3389/fmars.2021.615567 https://doaj.org/article/29f0c48df22e4075b94b6035afb6abf1 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Frontiers in Marine Science, Vol 8 (2021) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2021.615567/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2021.615567 https://doaj.org/article/29f0c48df22e4075b94b6035afb6abf1 |
op_doi |
https://doi.org/10.3389/fmars.2021.615567 |
container_title |
Frontiers in Marine Science |
container_volume |
8 |
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1766363306522574848 |