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

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 thr...

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Bibliographic Details
Published in:Canadian journal of fisheries and aquatic sciences 2005-12, Vol.62 (12), p.2675-2682
Main Authors: Genna, R L, Mordue, W, Pike, A W, Mordue (Luntz), A J
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied ecology
Aquaculture
Biological and medical sciences
Copepoda
Crustacea
Distribution patterns
Exploitation and management of natural biological resources (hunting, fishing and exploited populations survey, etc.)
Fish
Fundamental and applied biological sciences. Psychology
Infections
Invertebrates
Larvae
Lepeophtheirus salmonis
Lice
Light intensity
Marine
Marine invertebrates
Mortality
Salinity
Salmo salar
Salmon
Studies
Surface area
Zoology
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Summary: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 (20‰, 27‰, 35‰), and host velocity (0.2, 7.0, 15.0 cm·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.
ISSN:0706-652X
1205-7533
DOI:10.1139/f05-163