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• W2912878240 abstract "AEI Aquaculture Environment Interactions Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections AEI 11:181-190 (2019) - DOI: https://doi.org/10.3354/aei00303 Effects of step salinity gradients on salmon lice larvae behaviour and dispersal T. Crosbie1, D. W. Wright2, F. Oppedal2, I. A. Johnsen2, F. Samsing1,3, T. Dempster1,* 1Sustainable Aquaculture Laboratory—Tropical and Temperate (SALTT), School of BioSciences, University of Melbourne, Victoria 3010, Australia 2Matre Aquaculture Research Station, Institute of Marine Research, 5984 Matredal, Norway 3CSIRO, Castray Esplanade, Battery Point, Tasmania 7004, Australia *Corresponding author: dempster@unimelb.edu.au ABSTRACT: In trying to deal with the problematic salmon louse Lepeophtheirus salmonis in salmon aquaculture, strategies to better prevent infestations are gaining traction. Successful prevention requires an accurate understanding of the environmental influences that alter the distribution of the planktonic stages of lice in the water column in space and time. Here, we tested the salinity preferences of nauplii and copepodid larval stages using step salinity column experiments. Under consistent temperature and lighting conditions, we created step gradients using a bottom layer of full salinity (34.7 ppt), with an upper layer of equal or lower salinity (~34.7 to 16 ppt). Lice entered the column in the lower layer and dispersed for 1 h before their position was recorded. Both nauplii and copepodids increasingly avoided the overlying layers as they became more brackish. However, the strength of avoidance differed between nauplii and copepodids. Nauplii almost completely avoided salinities below 30 ppt. For copepodids, there was a more gradual decline in the proportion preferring the less saline overlying layer, and the presence of some individuals occurred even at 16 to 20 ppt. Both stages aggregated at or just below the halocline, with no aggregation evident in isohaline columns at the same depth. For nauplii, clustering within the halocline was particularly strong. When integrated into a sea lice dispersal model, the new salinity preferences we determined markedly altered dispersal patterns in scenarios when salinity gradients were present. Our results have implications for the mapping of salmon lice larval behaviour and dispersal, with benefits for aquaculture planning and management. KEY WORDS: Halocline · Lepeophtheirus salmonis · Model · Sea lice · Vertical distribution Full text in pdf format Supplementary material PreviousNextCite this article as: Crosbie T, Wright DW, Oppedal F, Johnsen IA, Samsing F, Dempster T (2019) Effects of step salinity gradients on salmon lice larvae behaviour and dispersal. Aquacult Environ Interact 11:181-190. https://doi.org/10.3354/aei00303 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AEI Vol. 11. Online publication date: May 23, 2019 Print ISSN: 1869-215X; Online ISSN: 1869-7534 Copyright © 2019 Inter-Research." @default.
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• W2912878240 date "2019-05-23" @default.
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• W2912878240 title "Effects of step salinity gradients on salmon lice larvae behaviour and dispersal" @default.
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• W2912878240 doi "https://doi.org/10.3354/aei00303" @default.
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