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Site selection of Acanthochondria cornuta (Copepoda: Chondracanthidae) in Platichthys flesus (Teleostei: Pleuronectidae)

Published online by Cambridge University Press:  18 May 2011

F. I. CAVALEIRO  and
M. J. SANTOS
F. I. CAVALEIRO*
Affiliation:
Universidade do Porto, Faculdade de Ciências, Departamento de Biologia, Rua do Campo Alegre, s/n, Edifício FC4, 4169-007 Porto, Portugal CIMAR Laboratório Associado/CIIMAR, Centro Interdisciplinar de Investigação Marinha e Ambiental, Universidade do Porto, Rua dos Bragas, 289, 4050-123 Porto, Portugal
M. J. SANTOS
Affiliation:
Universidade do Porto, Faculdade de Ciências, Departamento de Biologia, Rua do Campo Alegre, s/n, Edifício FC4, 4169-007 Porto, Portugal CIMAR Laboratório Associado/CIIMAR, Centro Interdisciplinar de Investigação Marinha e Ambiental, Universidade do Porto, Rua dos Bragas, 289, 4050-123 Porto, Portugal
*
*Corresponding author: Universidade do Porto, Faculdade de Ciências, Departamento de Biologia, Rua do Campo Alegre, s/n, Edifício FC4, 4169-007 Porto, Portugal. Tel: +351 220 402 805. Fax: +351 220 402 709. E-mail: francisca.cavaleiro@gmail.com
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Summary

Acanthochondria cornuta (Copepoda: Chondracanthidae) (N=4841; prevalence: 80·0%; mean±s.d. [range] intensity: 28·8±24·0 [1–110] parasites) infected the branchial chambers of the European flounder, Platichthys flesus (L.), (N=210) according to an established spatial pattern. This was independent of host size. Higher intensities resulted, most frequently, in higher numbers of infection sites, probably due to increased intraspecific competition. Preferential infection of the ocular side was supported by the recorded abundance data and reflected, probably, the fish's bottom-dwelling behaviour. As the parasite develops from one stage into another, it seems to migrate towards different sites: the copepodites and pre-adult females occurred, mainly, in the holobranchs; the adults preferred the internal wall (non-gravid/post-gravid females; adult males) or the pseudobranchs (gravid females). The ventilating water current along with the blood supply are suggested as 2 major factors in determining parasite spatial distribution within the chamber. Parasite crowding in a restricted and narrow space of the posterior region of the internal wall was recorded frequently and resembled that previously reported for the plaice. Differences to other host-parasite systems previously studied should relate with the anatomy of the respiratory apparatus. Bigamous females are reported for the first time.

Keywords

Acanthochondria cornutasite selectionbranchial chamberPlatichthys flesus
Type
Research Article
Information
Parasitology , Volume 138 , Issue 8 , July 2011 , pp. 1061 - 1067
Copyright
Copyright © Cambridge University Press 2011

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