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

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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 (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.

Nous avons quantifié l'intensité et la répartition de la pré-fixation des copépodites du pou de mer, Lepeophtheirus salmonis, sur les saumoneaux de l'hôte, le saumon atlantique, Salmo salar, sous 27 régimes infectieux dans des conditions contrôlées de canalisation artificielle. Chaque régime infectieux représente un degré d'interaction entre trois niveaux (faible, moyen, élevé) de facteurs physiques, soit la lumière (10, 300 et 800 lux), la salinité (20, 27, 35 ‰) et la vitesse de déplacement de l'hôte (0,2, 7,0, 15,0 cm·s–1). La lumière, la salinité et la vitesse de l'hôte déterminent de façon indépendante et de façon interactive la répartition et la densité du nombre de copépodites en pré-fixation sur les hôtes. La surface externe de l'hôte affecte aussi le nombre de copépodites attachés en pré-fixation. La répartition des copépodites en pré-fixation sur la surface corporelle de l'hôte correspond à celles des copépodites et des larves chalimus signalées dans d'autres études, avec les plus grands nombres sur les nageoires, en particulier la dorsale, la caudale et les pectorales. La pré-fixation des copépodites se fait sur les branchies dans toutes les conditions. C'est probablement la pré-fixation différentielle et non la mortalité sélective qui explique les patrons de répartition des stades fixés observés dans les autres études.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2005-12-01

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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