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Parasitization of juvenile edible crabs (Cancer pagurus) by the dinoflagellate, Hematodinium sp.: pathobiology, seasonality and its potential effects on commercial fisheries

Published online by Cambridge University Press:  14 August 2014

AMANDA L. SMITH ,
LUCY HIRSCHLE ,
CLAIRE L. VOGAN  and
ANDREW F. ROWLEY
AMANDA L. SMITH
Affiliation:
Department of Biosciences, College of Science, Swansea University, Swansea SA2 8PP, Wales, UK
LUCY HIRSCHLE
Affiliation:
Department of Biosciences, College of Science, Swansea University, Swansea SA2 8PP, Wales, UK
CLAIRE L. VOGAN
Affiliation:
College of Medicine, Swansea University, Swansea SA2 8PP, Wales, UK
ANDREW F. ROWLEY*
Affiliation:
Department of Biosciences, College of Science, Swansea University, Swansea SA2 8PP, Wales, UK
*
*Corresponding author: Department of Biosciences, College of Science, Swansea University, Singleton Park, Swansea SA2 8PP, Wales, UK. E-mail: a.f.rowley@swansea.ac.uk
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Summary

This study reports on the prevalence and severity of infections caused by the parasitic dinoflagellate, Hematodinium in juvenile edible crabs (Cancer pagurus) found in 2 intertidal survey sites (Mumbles Head and Oxwich Bay) in the Bristol Channel, UK. Crabs were assessed for the presence and severity of Hematodinium infections by the histological examination of infected tissues. Such infections were found to exhibit a seasonal trend in the 2 study areas with high numbers of animals (ca. 30%) infected in the spring to summer but with low severity. Conversely, in November only ca. 10% of crabs were infected but these animals had large numbers of parasites in their haemolymph and other tissues. At this time, the carapace and underlying tissues of infected crabs had the chalky, pinkish-orange appearance that is characteristic of this disease. Hematodinium-infected crabs ranged in size from 12 to 74 mm carapace width. Overall, it is concluded that the high prevalence of infection of juvenile crabs in this area may have implications for the sustainability of the edible crab fishery in the Bristol Channel.

Keywords

edible crab fisheriesdisease ecologydecapod crustaceans
Type
Research Article
Information
Parasitology , Volume 142 , Issue 3 , March 2015 , pp. 428 - 438
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Copyright
Copyright © Cambridge University Press 2014 

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