Physiological consequences of 'premature freshwater return' for wild sea-run brown trout (Salmo trutta) postsmolts infested with sea lice (Lepeophtheirus salmonis)

The physiological consequences of "premature migratory return" to freshwater for wild sea-run brown trout (Salmo trutta) smolts infested with sea lice (Lepeoplitheirus salmonis) were investigated in the laboratory. Osmoregulatory, metabolic, and stress markers were analysed in order to ass...

Full description

Bibliographic Details
Published in:Canadian Journal of Fisheries and Aquatic Sciences
Main Authors: Wells, A, Grierson, C, Marshall, L, MacKenzie, Monique Lea, Russon, I, Reinhardy, H, Sivertsgård, R, Bjørn, P, Finstad, B, Bonga, S, Todd, Christopher David, Hazon, Neil
Format: Article in Journal/Newspaper
Language:English
Published: 2007
Subjects:
PLASMA GROWTH-HORMONE
ATLANTIC SALMON
CALIGUS-ELONGATUS
TRANSPORT STRESS
WESTERN SCOTLAND
RAINBOW-TROUT
SALAR L
CALIGIDAE
COPEPODA
INFECTION
Atlantic salmon
Online Access:https://research-portal.st-andrews.ac.uk/en/researchoutput/physiological-consequences-of-premature-freshwater-return-for-wild-searun-brown-trout-salmo-trutta-postsmolts-infested-with-sea-lice-lepeophtheirus-salmonis(1dd1bd61-6b84-4d66-9787-acf63c73bf73).html
https://doi.org/10.1139/F07-107
http://www.scopus.com/inward/record.url?scp=36249024647&partnerID=8YFLogxK
Description
Summary:The physiological consequences of "premature migratory return" to freshwater for wild sea-run brown trout (Salmo trutta) smolts infested with sea lice (Lepeoplitheirus salmonis) were investigated in the laboratory. Osmoregulatory, metabolic, and stress markers were analysed in order to assess the potential consequences of transfer to freshwater, 19 days after the challenge with L. salmonis. Infestation intensity was significantly reduced following transfer to freshwater, and mortality rates were markedly higher in infested fish maintained in seawater vs. fish that were transferred to freshwater. Significant sea lice effects, consistent across a number of physiological markers, were apparent once L. salmonis developed to the mobile stages. Plasma chloride, lactate, and cortisol all were significantly higher than control values, and liver glycogen concentration was significantly reduced in infested fish in seawater. After return to freshwater, these physiological measures returned to control levels, but significant lice effects persisted for fish maintained in seawater. Premature return of infested sea-run brown trout to freshwater does, therefore, confer significant short-term physiological benefits across a range of osmoregulatory, metabolic, and stress markers.

Similar Items