Light intensity, salinity, and host velocity influence presettlement intensity and distribution on hosts by copepodids of sea lice, Lepeophtheirus salmonis

William Mordue, Alan Pike, Anne Jennifer Mordue, A Jenny Mordue

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Intensity and distribution of presettlement by the copepodid of the sea louse, Lepeophtheirus salmonis, on smolts of its host Atlantic salmon, Salmo salar, were quantified for 27 infection regimes under controlled flume conditions. Each infection regime represented a level of interaction between three levels (low, medium, high) of the physical factors of light (10, 300, 800 lx), salinity (20e, 27e, 35e), and host velocity (0.2, 7.0, 15.0 cm center dot s(-1)). Light, salinity, and host velocity independently and interactively determined the distribution and number of presettled copepodids on hosts. Host surface area also influenced the number of attached preestablished copepodids. The distribution of presettled copepodids on the host body surface closely corresponded to that of settled copepodids and chalimi reported from other studies, with the greatest levels observed on the fins, in particular the dorsal, caudal, and pectoral fins. Copepodid presettlement occurred on the gills under all conditions. Differential presettlement, not selective mortality, probably produces the distribution pattern of settled stages seen in other studies.

Original languageEnglish
Pages (from-to)2675-2682
Number of pages8
JournalCanadian Journal of Fisheries and Aquatic Sciences
Volume62
DOIs
Publication statusPublished - 2005

Keywords

  • Atlantic salmon
  • Salar L.
  • Trutta L.
  • post-settlement dispersal
  • Western Scotland
  • larval stages
  • post-smolts
  • still water
  • settlement
  • Caligidae

Cite this

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title = "Light intensity, salinity, and host velocity influence presettlement intensity and distribution on hosts by copepodids of sea lice, Lepeophtheirus salmonis",
abstract = "Intensity and distribution of presettlement by the copepodid of the sea louse, Lepeophtheirus salmonis, on smolts of its host Atlantic salmon, Salmo salar, were quantified for 27 infection regimes under controlled flume conditions. Each infection regime represented a level of interaction between three levels (low, medium, high) of the physical factors of light (10, 300, 800 lx), salinity (20e, 27e, 35e), and host velocity (0.2, 7.0, 15.0 cm center dot s(-1)). Light, salinity, and host velocity independently and interactively determined the distribution and number of presettled copepodids on hosts. Host surface area also influenced the number of attached preestablished copepodids. The distribution of presettled copepodids on the host body surface closely corresponded to that of settled copepodids and chalimi reported from other studies, with the greatest levels observed on the fins, in particular the dorsal, caudal, and pectoral fins. Copepodid presettlement occurred on the gills under all conditions. Differential presettlement, not selective mortality, probably produces the distribution pattern of settled stages seen in other studies.",
keywords = "Atlantic salmon, Salar L., Trutta L., post-settlement dispersal, Western Scotland, larval stages, post-smolts, still water, settlement, Caligidae",
author = "William Mordue and Alan Pike and Mordue, {Anne Jennifer} and Mordue, {A Jenny}",
year = "2005",
doi = "10.1139/f05-163",
language = "English",
volume = "62",
pages = "2675--2682",
journal = "Canadian Journal of Fisheries and Aquatic Sciences",
issn = "0706-652X",
publisher = "CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS",

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TY - JOUR

T1 - Light intensity, salinity, and host velocity influence presettlement intensity and distribution on hosts by copepodids of sea lice, Lepeophtheirus salmonis

AU - Mordue, William

AU - Pike, Alan

AU - Mordue, Anne Jennifer

AU - Mordue, A Jenny

PY - 2005

Y1 - 2005

N2 - Intensity and distribution of presettlement by the copepodid of the sea louse, Lepeophtheirus salmonis, on smolts of its host Atlantic salmon, Salmo salar, were quantified for 27 infection regimes under controlled flume conditions. Each infection regime represented a level of interaction between three levels (low, medium, high) of the physical factors of light (10, 300, 800 lx), salinity (20e, 27e, 35e), and host velocity (0.2, 7.0, 15.0 cm center dot s(-1)). Light, salinity, and host velocity independently and interactively determined the distribution and number of presettled copepodids on hosts. Host surface area also influenced the number of attached preestablished copepodids. The distribution of presettled copepodids on the host body surface closely corresponded to that of settled copepodids and chalimi reported from other studies, with the greatest levels observed on the fins, in particular the dorsal, caudal, and pectoral fins. Copepodid presettlement occurred on the gills under all conditions. Differential presettlement, not selective mortality, probably produces the distribution pattern of settled stages seen in other studies.

AB - Intensity and distribution of presettlement by the copepodid of the sea louse, Lepeophtheirus salmonis, on smolts of its host Atlantic salmon, Salmo salar, were quantified for 27 infection regimes under controlled flume conditions. Each infection regime represented a level of interaction between three levels (low, medium, high) of the physical factors of light (10, 300, 800 lx), salinity (20e, 27e, 35e), and host velocity (0.2, 7.0, 15.0 cm center dot s(-1)). Light, salinity, and host velocity independently and interactively determined the distribution and number of presettled copepodids on hosts. Host surface area also influenced the number of attached preestablished copepodids. The distribution of presettled copepodids on the host body surface closely corresponded to that of settled copepodids and chalimi reported from other studies, with the greatest levels observed on the fins, in particular the dorsal, caudal, and pectoral fins. Copepodid presettlement occurred on the gills under all conditions. Differential presettlement, not selective mortality, probably produces the distribution pattern of settled stages seen in other studies.

KW - Atlantic salmon

KW - Salar L.

KW - Trutta L.

KW - post-settlement dispersal

KW - Western Scotland

KW - larval stages

KW - post-smolts

KW - still water

KW - settlement

KW - Caligidae

U2 - 10.1139/f05-163

DO - 10.1139/f05-163

M3 - Article

VL - 62

SP - 2675

EP - 2682

JO - Canadian Journal of Fisheries and Aquatic Sciences

JF - Canadian Journal of Fisheries and Aquatic Sciences

SN - 0706-652X

ER -