Infection with low numbers of the sea louse Lepeophtheirus salmonis induces stress-related effects in postsmolt Atlantic salmon ( Salmo salar)
Infection of postsmolt Atlantic salmon (Salmo salar) with three, six, or 10 preadult and adult sea lice (Lepeophtheirus salmonis) per fish resulted in changes to epithelial structure and at sites in the skin and gill, distant from lice attachment and feeding. In the skin, increased apoptosis and nec...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Canadian Science Publishing
1999
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Online Access: | http://dx.doi.org/10.1139/f99-021 http://www.nrcresearchpress.com/doi/pdf/10.1139/f99-021 |
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crcansciencepubl:10.1139/f99-021 2024-09-30T14:32:26+00:00 Infection with low numbers of the sea louse Lepeophtheirus salmonis induces stress-related effects in postsmolt Atlantic salmon ( Salmo salar) Nolan, D T Reilly, P Bonga, SE Wendelaar 1999 http://dx.doi.org/10.1139/f99-021 http://www.nrcresearchpress.com/doi/pdf/10.1139/f99-021 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 56, issue 6, page 947-959 ISSN 0706-652X 1205-7533 journal-article 1999 crcansciencepubl https://doi.org/10.1139/f99-021 2024-09-05T04:11:14Z Infection of postsmolt Atlantic salmon (Salmo salar) with three, six, or 10 preadult and adult sea lice (Lepeophtheirus salmonis) per fish resulted in changes to epithelial structure and at sites in the skin and gill, distant from lice attachment and feeding. In the skin, increased apoptosis and necrosis occurred in the superficial epithelial cells and numbers of mucous cells decreased. In the gill, where no lice were found, uplifting of the epithelium, intercellular swelling, and infiltration by leukocytes occurred in filaments and lamellae. High cell turnover of chloride cells was associated with significantly elevated gill Na + /K + -ATPase activities. Serum chloride levels were elevated in the 3 and 6 lice/fish groups, and the serum Na to Cl ratio was lower in all parasitized groups at 5 days. The results indicate that infection with low numbers of the preadult and adult parasite induced changes characteristic of a stress response. In the low- and medium-infested groups, homeostatic recovery had occurred by 10 days, but recovery was incomplete in the highly infected group. Thus, 10 lice per fish, which is a low infestation level in nature, is stressful and creates a long period during which the overall condition of the skin and gill epithelia may render the fish susceptible to secondary infections. Article in Journal/Newspaper Atlantic salmon Salmo salar Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 56 6 947 959 |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
description |
Infection of postsmolt Atlantic salmon (Salmo salar) with three, six, or 10 preadult and adult sea lice (Lepeophtheirus salmonis) per fish resulted in changes to epithelial structure and at sites in the skin and gill, distant from lice attachment and feeding. In the skin, increased apoptosis and necrosis occurred in the superficial epithelial cells and numbers of mucous cells decreased. In the gill, where no lice were found, uplifting of the epithelium, intercellular swelling, and infiltration by leukocytes occurred in filaments and lamellae. High cell turnover of chloride cells was associated with significantly elevated gill Na + /K + -ATPase activities. Serum chloride levels were elevated in the 3 and 6 lice/fish groups, and the serum Na to Cl ratio was lower in all parasitized groups at 5 days. The results indicate that infection with low numbers of the preadult and adult parasite induced changes characteristic of a stress response. In the low- and medium-infested groups, homeostatic recovery had occurred by 10 days, but recovery was incomplete in the highly infected group. Thus, 10 lice per fish, which is a low infestation level in nature, is stressful and creates a long period during which the overall condition of the skin and gill epithelia may render the fish susceptible to secondary infections. |
format |
Article in Journal/Newspaper |
author |
Nolan, D T Reilly, P Bonga, SE Wendelaar |
spellingShingle |
Nolan, D T Reilly, P Bonga, SE Wendelaar Infection with low numbers of the sea louse Lepeophtheirus salmonis induces stress-related effects in postsmolt Atlantic salmon ( Salmo salar) |
author_facet |
Nolan, D T Reilly, P Bonga, SE Wendelaar |
author_sort |
Nolan, D T |
title |
Infection with low numbers of the sea louse Lepeophtheirus salmonis induces stress-related effects in postsmolt Atlantic salmon ( Salmo salar) |
title_short |
Infection with low numbers of the sea louse Lepeophtheirus salmonis induces stress-related effects in postsmolt Atlantic salmon ( Salmo salar) |
title_full |
Infection with low numbers of the sea louse Lepeophtheirus salmonis induces stress-related effects in postsmolt Atlantic salmon ( Salmo salar) |
title_fullStr |
Infection with low numbers of the sea louse Lepeophtheirus salmonis induces stress-related effects in postsmolt Atlantic salmon ( Salmo salar) |
title_full_unstemmed |
Infection with low numbers of the sea louse Lepeophtheirus salmonis induces stress-related effects in postsmolt Atlantic salmon ( Salmo salar) |
title_sort |
infection with low numbers of the sea louse lepeophtheirus salmonis induces stress-related effects in postsmolt atlantic salmon ( salmo salar) |
publisher |
Canadian Science Publishing |
publishDate |
1999 |
url |
http://dx.doi.org/10.1139/f99-021 http://www.nrcresearchpress.com/doi/pdf/10.1139/f99-021 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 56, issue 6, page 947-959 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f99-021 |
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Canadian Journal of Fisheries and Aquatic Sciences |
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56 |
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6 |
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947 |
op_container_end_page |
959 |
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1811636605200367616 |