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The caligid life cycle: new evidence from Lepeophtheirus elegans reconciles the cycles of Caligus and Lepeophtheirus (Copepoda: Caligidae)

The developmental stages of the sea louse Lepeophtheirus elegans (Copepoda: Caligidae) are described from material collected from marine ranched Korean rockfish, Sebastes schlegelii. In L. elegans, setal number on the proximal segment of the antennule increases from 3 in the copepodid to 27 in the a...

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Autores principales: Venmathi Maran, Balu Alagar, Moon, Seong Yong, Ohtsuka, Susumu, Oh, Sung-Yong, Soh, Ho Young, Myoung, Jung-Goo, Iglikowska, Anna, Boxshall, Geoffrey Allan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: EDP Sciences 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3718518/
https://www.ncbi.nlm.nih.gov/pubmed/23647664
http://dx.doi.org/10.1051/parasite/2013015
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author Venmathi Maran, Balu Alagar
Moon, Seong Yong
Ohtsuka, Susumu
Oh, Sung-Yong
Soh, Ho Young
Myoung, Jung-Goo
Iglikowska, Anna
Boxshall, Geoffrey Allan
author_facet Venmathi Maran, Balu Alagar
Moon, Seong Yong
Ohtsuka, Susumu
Oh, Sung-Yong
Soh, Ho Young
Myoung, Jung-Goo
Iglikowska, Anna
Boxshall, Geoffrey Allan
author_sort Venmathi Maran, Balu Alagar
collection PubMed
description The developmental stages of the sea louse Lepeophtheirus elegans (Copepoda: Caligidae) are described from material collected from marine ranched Korean rockfish, Sebastes schlegelii. In L. elegans, setal number on the proximal segment of the antennule increases from 3 in the copepodid to 27 in the adult. Using the number of setae as a stage marker supports the inference that the post-naupliar phase of the life cycle comprises six stages: copepodid, chalimus I, chalimus II, pre-adult I, pre-adult II, and the adult. We observed variation in body length in both of the chalimus stages which we consider represents an early expression of sexual size dimorphism. We interpret the larger specimens of chalimus I as putative females, and the smaller as putative males; similarly with chalimus II, larger specimens are putative females and the smaller are males. Two patterns of life cycle are currently recognized within the Caligidae but the evidence presented here reconciles the two. We conclude that the typical caligid life cycle comprises only eight stages: two naupliar, one copepodid, and four chalimus stages preceding the adult in Caligus, but with the four chalimus stages represented by two chalimus and two pre-adult stages in Lepeophtheirus. This is a profound change with significant implications for the aquaculture industry, given that lice monitoring protocols include counts of chalimus stages and use temperature to predict when they will moult into the more pathogenic, mobile pre-adults. Lice management strategies must be tailored to the precise life cycle of the parasite.
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spelling pubmed-37185182013-07-24 The caligid life cycle: new evidence from Lepeophtheirus elegans reconciles the cycles of Caligus and Lepeophtheirus (Copepoda: Caligidae) Venmathi Maran, Balu Alagar Moon, Seong Yong Ohtsuka, Susumu Oh, Sung-Yong Soh, Ho Young Myoung, Jung-Goo Iglikowska, Anna Boxshall, Geoffrey Allan Parasite Research Article The developmental stages of the sea louse Lepeophtheirus elegans (Copepoda: Caligidae) are described from material collected from marine ranched Korean rockfish, Sebastes schlegelii. In L. elegans, setal number on the proximal segment of the antennule increases from 3 in the copepodid to 27 in the adult. Using the number of setae as a stage marker supports the inference that the post-naupliar phase of the life cycle comprises six stages: copepodid, chalimus I, chalimus II, pre-adult I, pre-adult II, and the adult. We observed variation in body length in both of the chalimus stages which we consider represents an early expression of sexual size dimorphism. We interpret the larger specimens of chalimus I as putative females, and the smaller as putative males; similarly with chalimus II, larger specimens are putative females and the smaller are males. Two patterns of life cycle are currently recognized within the Caligidae but the evidence presented here reconciles the two. We conclude that the typical caligid life cycle comprises only eight stages: two naupliar, one copepodid, and four chalimus stages preceding the adult in Caligus, but with the four chalimus stages represented by two chalimus and two pre-adult stages in Lepeophtheirus. This is a profound change with significant implications for the aquaculture industry, given that lice monitoring protocols include counts of chalimus stages and use temperature to predict when they will moult into the more pathogenic, mobile pre-adults. Lice management strategies must be tailored to the precise life cycle of the parasite. EDP Sciences 2013 2013-05-07 /pmc/articles/PMC3718518/ /pubmed/23647664 http://dx.doi.org/10.1051/parasite/2013015 Text en © B. Venmathi Maran et al., published by EDP Sciences, 2013 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Venmathi Maran, Balu Alagar
Moon, Seong Yong
Ohtsuka, Susumu
Oh, Sung-Yong
Soh, Ho Young
Myoung, Jung-Goo
Iglikowska, Anna
Boxshall, Geoffrey Allan
The caligid life cycle: new evidence from Lepeophtheirus elegans reconciles the cycles of Caligus and Lepeophtheirus (Copepoda: Caligidae)
title The caligid life cycle: new evidence from Lepeophtheirus elegans reconciles the cycles of Caligus and Lepeophtheirus (Copepoda: Caligidae)
title_full The caligid life cycle: new evidence from Lepeophtheirus elegans reconciles the cycles of Caligus and Lepeophtheirus (Copepoda: Caligidae)
title_fullStr The caligid life cycle: new evidence from Lepeophtheirus elegans reconciles the cycles of Caligus and Lepeophtheirus (Copepoda: Caligidae)
title_full_unstemmed The caligid life cycle: new evidence from Lepeophtheirus elegans reconciles the cycles of Caligus and Lepeophtheirus (Copepoda: Caligidae)
title_short The caligid life cycle: new evidence from Lepeophtheirus elegans reconciles the cycles of Caligus and Lepeophtheirus (Copepoda: Caligidae)
title_sort caligid life cycle: new evidence from lepeophtheirus elegans reconciles the cycles of caligus and lepeophtheirus (copepoda: caligidae)
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3718518/
https://www.ncbi.nlm.nih.gov/pubmed/23647664
http://dx.doi.org/10.1051/parasite/2013015
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