Quantitative risk assessment of salmon louse-induced mortality of seaward-migrating post-smolt Atlantic salmon

Overview
TitleQuantitative risk assessment of salmon louse-induced mortality of seaward-migrating post-smolt Atlantic salmon
AuthorsKristoffersen AB, Qviller L, Helgesen KO, Vollset KW, Viljugrein H, Jansen PA
TypeJournal Article
Journal NameEpidemics
VolumeN/A
IssueN/A
Year2017
Page(s)N/A
CitationKristoffersen AB, Qviller L, Helgesen KO, Vollset KW, Viljugrein H, Jansen PA. Quantitative risk assessment of salmon louse-induced mortality of seaward-migrating post-smolt Atlantic salmon. Epidemics. 2017 Dec 02.

Abstract

The Norwegian government recently implemented a new management system to regulate salmon farming in Norway, aiming to promote environmentally sustainable growth in the aquaculture industry. The Norwegian coast has been divided into 13 production zones and the volume of salmonid production in the zones will be regulated based on salmon lice effects on wild salmonids. Here we present a model for assessing salmon louse-induced mortality of seaward-migrating post-smolts of Atlantic salmon. The model quantifies expected salmon lice infestations and louse-induced mortality of migrating post-smolt salmon from 401 salmon rivers draining into Norwegian coastal waters. It is assumed that migrating post-smolts follow the shortest path from river outlets to the high seas, at constant progression rates. During this migration, fish are infested by salmon lice of farm origin according to an empirical infestation model. Furthermore, louse-induced mortality is estimated from the estimated louse infestations. Rivers draining into production zones on the West Coast of Norway were at the highest risk of adverse lice effects. In comparison, rivers draining into northerly production zones, along with the southernmost production zone, were at lower risk. After adjusting for standing stock biomass, estimates of louse-egg output varied by factors of up to 8 between production zones. Correlation between biomass adjusted output of louse infestation and densities of farmed salmon in the production zones suggests that a large-scale density-dependent host-parasite effect is a major driver of louse infestation rates and parasite-induced mortality. The estimates are sensitive to many of the processes in the chain of events in the model. Nevertheless, we argue that the model is suited to assess spatial and temporal risks associated with farm-origin salmon lice.

Properties
Additional details for this publication include:
Property NameValue
Publication ModelPrint-Electronic
ISSN1878-0067
eISSN1878-0067
Publication Date2017 Dec 02
Journal AbbreviationEpidemics
PIIS1755-4365(17)30165-2
Elocation10.1016/j.epidem.2017.11.001
DOI10.1016/j.epidem.2017.11.001
CopyrightCopyright © 2017 The Authors. Published by Elsevier B.V. All rights reserved.
LanguageEnglish
Language Abbreng
Publication TypeJournal Article
Journal CountryNetherlands
Cross References
This publication is also available in the following databases:
DatabaseAccession
PMID: PMID:29233546