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Black sea bass are a host in the developmental cycle of Lernaeenicus radiatus (Copepoda: Pennellidae): insights into parasite morphology, gill pathology and genetics

Published online by Cambridge University Press:  19 December 2019

J. Lovy Open the ORCID record for J. Lovy [Opens in a new window]  and
S. E. Friend
J. Lovy*
Affiliation:
Office of Fish and Wildlife Health and Forensics, N.J. Division of Fish and Wildlife, 605 Pequest Road, Oxford, NJ 07863, USA
S. E. Friend
Affiliation:
Office of Fish and Wildlife Health and Forensics, N.J. Division of Fish and Wildlife, 605 Pequest Road, Oxford, NJ 07863, USA
*
Author for correspondence: J. Lovy, E-mail: Jan.Lovy@dep.nj.gov
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Abstract

Lernaeenicus radiatus, a mesoparasitic pennellid copepod, has long been known in the northwest Atlantic with metamorphosed females infecting the muscle of marine fish. The study herein is the first to identify a definitive first host, black sea bass Centropristis striata, for L. radiatus supporting larval development to adults and sexual reproduction in the gills. This finding suggests a two-host life cycle for L. radiatus, with black sea bass as the first host. Heavy infections in the gill were associated with considerable pathology related to a unique and invasive attachment process that penetrated the gill and selectively attached to the gill filament cartilage. The morphology of the developing copepod was highly conserved with that of a related pennellid copepod, Lernaeocera branchialis, though was distinguished by the attachment process, unique pigmentation and other morphologic features described herein. Sequencing the small and large subunits of the ribosomal RNA and mitochondrial cytochrome c oxidase subunit I genes demonstrated L. radiatus to share closer identities with Lernaeocera and Haemobaphes spp. pennellid copepods rather than other Lernaeenicus spp. available in GenBank to date. Taxonomy of L. radiatus is discussed in relation to life cycles, tissue tropism, morphology and genetics of other closely related pennellid copepods.

Keywords

Black sea bassgeneticsgill pathologyLernaeenicus radiatuslife cyclePennellidae.

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Type
Research Article
Information
Parasitology , Volume 147 , Issue 4 , April 2020 , pp. 478 - 490
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Copyright © Cambridge University Press 2019

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