Differential Effects of Adult Salmon Lice Lepeophtheirus salmonis on Physiological Responses of Sockeye Salmon and Atlantic Salmon

Overview
TitleDifferential Effects of Adult Salmon Lice Lepeophtheirus salmonis on Physiological Responses of Sockeye Salmon and Atlantic Salmon
AuthorsLong A, Garver KA, Jones SRM
TypeJournal Article
Journal NameJournal of aquatic animal health
VolumeN/A
IssueN/A
Year2018
Page(s)N/A
CitationLong A, Garver KA, Jones SRM. Differential Effects of Adult Salmon Lice Lepeophtheirus salmonis on Physiological Responses of Sockeye Salmon and Atlantic Salmon. Journal of aquatic animal health. 2018 Dec 19.

Abstract

The salmon louse Lepeophtheirus salmonis, a type of sea lice (family Caligidae), is enzootic in marine waters of British Columbia and poses a health risk to both farmed Atlantic Salmon Salmo salar and wild Pacific salmon Oncorhynchus spp. At the adult stage, sea lice infections can often result in severe cutaneous lesions in their salmonid hosts. To evaluate and compare the physiological consequences of adult L. salmonis infections, smolts of Atlantic Salmon and Sockeye Salmon O. nerka were exposed to 2 (low), 6 (medium), or 10 (high) adult female lice/fish. Mean lice abundance decreased over time in all groups. Skin disruption due to parasite infection was observed in both species. Plasma samples were collected from infected fish and uninfected controls at 1, 3, 5, and 7 d postinfection and measured for indicators of osmoregulatory function and stress. Sockeye Salmon, regardless of L. salmonis exposure level, showed a rapid onset of elevated osmolality and sodium and chloride ion concentrations which were sustained until 7 d postinfection when values returned to levels comparable with the unexposed controls. Conversely, these effects were not measured in Atlantic Salmon. Additionally, differential host effects in blood glucose levels were observed, with Sockeye Salmon displaying immediate elevation in glucose. Relative to Atlantic Salmon, infection with L. salmonis caused a profound physiological impact to Sockeye Salmon characterized by loss of osmoregulatory integrity and a stress response. This work provides the first comprehensive report of the physiological consequences of infections with adult L. salmonis in Sockeye Salmon smolts and helps to further define the mechanisms of susceptibility in this species.

Author Details
Additional information about authors:
Details
1Amy Long
2Kyle A Garver
3Simon R M Jones
Properties
Additional details for this publication include:
Property NameValue
Journal CountryUnited States
Publication TypeJournal Article
Language Abbreng
LanguageEnglish
Copyright© 2018 Her Majesty the Queen in Right of Canada. Journal of Aquatic Animal Health published by Wiley Periodicals, Inc. on behalf of American Fisheries Society.
Elocation10.1002/aah.10053
DOI10.1002/aah.10053
Journal AbbreviationJ. Aquat. Anim. Health
Publication Date2018 Dec 19
eISSN1548-8667
ISSN1548-8667
Publication ModelPrint-Electronic
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PMID: PMID:30566268